docs: add v0.5.2 release notes

Add changelog entries for recent commits:
- Health package: Kubernetes health probes
- Logger package: runtime level control and fixes
- Database package: config file override support

.github/copilot-instructions.md

@@ -0,0 +1 @@
+../CLAUDE.md

CHANGELOG.md

@@ -0,0 +1,53 @@
+# Release Notes - v0.5.2
+
+## Health Package
+- **Kubernetes-native health probes** - Added dedicated handlers for liveness (`/healthz`), readiness (`/readyz`), and startup (`/startupz`) probes
+- **Flexible configuration options** - New `WithLivenessHandler`, `WithReadinessHandler`, `WithStartupHandler`, and `WithServiceName` options
+- **JSON response formats** - Structured probe responses with service identification
+- **Backward compatibility** - Maintains existing `/__health` and `/` endpoints
+
+## Logger Package
+- **Runtime log level control** - Independent level management for stderr and OTLP loggers via `SetLevel()` and `SetOTLPLevel()`
+- **Environment variable support** - Configure levels with `LOG_LEVEL` and `OTLP_LOG_LEVEL` env vars
+- **String parsing utility** - New `ParseLevel()` function for converting string levels to `slog.Level`
+- **Buffering exporter fix** - Resolved "unlock of unlocked mutex" panic in `bufferingExporter`
+- **Initialization redesign** - Eliminated race conditions in TLS/tracing setup retry logic
+
+## Database Package
+- **Configuration file override** - Added `DATABASE_CONFIG_FILE` environment variable to specify custom database configuration file paths
+- **Flexible path configuration** - Override default `["database.yaml", "/vault/secrets/database.yaml"]` search paths when needed
+
+# Release Notes - v0.5.1
+
+## Observability Enhancements
+
+### OTLP Metrics Support
+- **New `metrics/` package** - OpenTelemetry-native metrics with OTLP export support for structured metrics collection
+- **Centralized OTLP configuration** - Refactored configuration to `internal/tracerconfig/` to eliminate code duplication across tracing, logging, and metrics
+- **HTTP retry support** - Added consistent retry configuration for all HTTP OTLP exporters to improve reliability
+
+### Enhanced Logging
+- **Buffering exporter** - Added OTLP log buffering to queue logs until tracing configuration is available
+- **TLS support for logs** - Client certificate authentication support for secure OTLP log export
+- **Improved logfmt formatting** - Better structured output for log messages
+
+### Tracing Improvements
+- **HTTP retry support** - OTLP trace requests now automatically retry on failure when using HTTP transport
+
+## Build System
+
+### Version Package Enhancements
+- **Unix epoch build time support** - Build time can now be injected as Unix timestamps (`$(date +%s)`) in addition to RFC3339 format
+- **Simplified build commands** - Reduces complexity of ldflags injection while maintaining backward compatibility
+- **Consistent output format** - All build times normalize to RFC3339 format regardless of input
+
+## API Changes
+
+### New Public Interfaces
+- `metrics.NewMeterProvider()` - Create OTLP metrics provider with centralized configuration
+- `metrics.Shutdown()` - Graceful shutdown for metrics exporters
+- `internal/tracerconfig` - Shared OTLP configuration utilities (internal package)
+
+### Dependencies
+- Added explicit OpenTelemetry metrics dependencies to `go.mod`
+- Updated tracing dependencies for retry support

CLAUDE.md

@@ -0,0 +1,163 @@
+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Commands
+
+### Testing
+- Run all tests: `go test ./...`
+- Run tests with verbose output: `go test -v ./...`
+- Run tests for specific package: `go test ./config`
+- Run specific test: `go test -run TestConfigBool ./config`
+
+### Building
+- Build all packages: `go build ./...`
+- Check module dependencies: `go mod tidy`
+- Verify dependencies: `go mod verify`
+
+### Code Quality
+- Format code: `go fmt ./...`
+- Vet code: `go vet ./...`
+- Run static analysis: `staticcheck ./...` (if available)
+
+## Architecture
+
+This is a common library (`go.ntppool.org/common`) providing shared infrastructure for the NTP Pool project. The codebase emphasizes observability, security, and modern Go practices.
+
+### Core Components
+
+**Web Service Foundation:**
+- `ekko/` - Enhanced Echo web framework with pre-configured middleware (OpenTelemetry, Prometheus, logging, security headers)
+- `health/` - Standalone health check HTTP server with `/__health` endpoint
+- `metricsserver/` - Prometheus metrics exposure via `/metrics` endpoint
+
+**Observability Stack:**
+- `logger/` - Structured logging with OpenTelemetry trace integration and multiple output formats
+- `tracing/` - OpenTelemetry distributed tracing with OTLP export support
+- `metricsserver/` - Prometheus metrics with custom registry
+
+**Configuration & Environment:**
+- `config/` - Environment-based configuration with code-generated accessors (`config_accessor.go`)
+- `version/` - Build metadata and version information with Cobra CLI integration
+
+**Security & Communication:**
+- `apitls/` - TLS certificate management with automatic renewal via certman
+- `kafka/` - Kafka client wrapper with TLS support for log streaming
+- `xff/fastlyxff/` - Fastly CDN IP range management for trusted proxy handling
+
+**Utilities:**
+- `ulid/` - Thread-safe ULID generation with monotonic ordering
+- `timeutil/` - JSON-serializable duration types
+- `types/` - Shared data structures (LogScoreAttributes for NTP server scoring)
+
+### Key Patterns
+
+**Functional Options:** Used extensively in `ekko/` for flexible service configuration
+**Interface-Based Design:** `CertificateProvider` in `apitls/` for pluggable certificate management
+**Context Propagation:** Throughout the codebase for cancellation and tracing
+**Graceful Shutdown:** Implemented in web servers and background services
+
+### Dependencies
+
+The codebase heavily uses:
+- Echo web framework with custom middleware stack
+- OpenTelemetry for observability (traces, metrics, logs)
+- Prometheus for metrics collection
+- Kafka for message streaming
+- Cobra for CLI applications
+
+### Code Generation
+
+`config/config_accessor.go` is generated - modify `config.go` and regenerate accessors when adding new configuration options.
+
+## Package Overview
+
+### `apitls/`
+TLS certificate management with automatic renewal support via certman. Provides a CA pool for trusted certificates and interfaces for pluggable certificate providers. Used for secure inter-service communication.
+
+### `config/`
+Environment-based configuration system with code-generated accessor methods. Handles deployment mode, hostname configuration, and TLS settings. Provides URL building utilities for web and management interfaces.
+
+### `ekko/`
+Enhanced Echo web framework wrapper with pre-configured middleware stack including OpenTelemetry tracing, Prometheus metrics, structured logging, gzip compression, and security headers. Supports HTTP/2 with graceful shutdown.
+
+### `health/`
+Standalone HTTP health check server that runs independently from the main application. Exposes `/__health` endpoint with configurable health handlers, timeouts, and graceful shutdown capabilities.
+
+### `kafka/`
+Kafka client wrapper with TLS support for secure log streaming. Provides connection management, broker discovery, and reader/writer factories with compression and batching optimizations.
+
+### `logger/`
+Structured logging system with OpenTelemetry trace integration. Supports multiple output formats (text, OTLP) with configurable log levels, systemd compatibility, and context-aware logging.
+
+### `metricsserver/`
+Dedicated Prometheus metrics HTTP server with custom registry isolation. Exposes `/metrics` endpoint with OpenMetrics support and graceful shutdown handling.
+
+### `timeutil/`
+JSON-serializable duration types that support both string parsing ("30s", "5m") and numeric nanosecond values. Compatible with configuration files and REST APIs.
+
+### `tracing/`
+OpenTelemetry distributed tracing setup with support for OTLP export via gRPC or HTTP. Handles resource detection, propagation, and automatic instrumentation with configurable TLS.
+
+### `types/`
+Shared data structures for the NTP Pool project. Currently contains `LogScoreAttributes` for NTP server scoring with JSON and SQL database compatibility.
+
+### `ulid/`
+Thread-safe ULID (Universally Unique Lexicographically Sortable Identifier) generation using cryptographically secure randomness. Optimized for simplicity and performance in high-concurrency environments.
+
+### `version/`
+Build metadata and version information system with Git integration. Provides CLI commands for Cobra and Kong frameworks, Prometheus build info metrics, and semantic version validation.
+
+### `xff/fastlyxff/`
+Fastly CDN IP range management for trusted proxy handling. Parses Fastly's IP ranges JSON file and generates Echo framework trust options for proper client IP extraction.
+
+## Go Development Best Practices
+
+### Code Style
+- Follow standard Go formatting (`go fmt ./...`)
+- Use `go vet ./...` for static analysis
+- Run `staticcheck ./...` when available
+- Prefer short, descriptive variable names
+- Use interfaces for testability and flexibility
+
+### Error Handling
+- Always handle errors explicitly
+- Use `errors.Join()` for combining multiple errors
+- Wrap errors with context using `fmt.Errorf("context: %w", err)`
+- Return early on errors to reduce nesting
+
+### Testing
+- Write table-driven tests when testing multiple scenarios
+- Use `t.Helper()` in test helper functions
+- Test error conditions, not just happy paths
+- Use `testing.Short()` for integration tests that can be skipped
+
+### Concurrency
+- Use contexts for cancellation and timeouts
+- Prefer channels for communication over shared memory
+- Use `sync.Once` for one-time initialization
+- Always call `defer cancel()` after `context.WithCancel()`
+
+### Performance
+- Use `sync.Pool` for frequently allocated objects
+- Prefer slices over arrays for better performance
+- Use `strings.Builder` for string concatenation in loops
+- Profile before optimizing with `go tool pprof`
+
+### Observability
+- Use structured logging with key-value pairs
+- Add OpenTelemetry spans for external calls
+- Include trace IDs in error messages
+- Use metrics for monitoring application health
+
+### Dependencies
+- Keep dependencies minimal and well-maintained
+- Use `go mod tidy` to clean up unused dependencies
+- Pin major versions to avoid breaking changes
+- Prefer standard library when possible
+
+### Security
+- Never log sensitive information (passwords, tokens)
+- Use `crypto/rand` for cryptographic randomness
+- Validate all inputs at API boundaries
+- Use TLS for all network communication

README.md

@@ -0,0 +1,20 @@
+
+Common library for the NTP Pool project with shared infrastructure components.
+
+## Packages
+
+- **apitls** - TLS setup for NTP Pool internal services with embedded CA
+- **config** - NTP Pool project configuration with environment variables
+- **ekko** - Enhanced Echo web framework with observability middleware
+- **health** - Standalone health check HTTP server
+- **kafka** - Kafka client wrapper with TLS support
+- **logger** - Structured logging with OpenTelemetry integration
+- **metricsserver** - Prometheus metrics HTTP server
+- **timeutil** - JSON-serializable duration types
+- **tracing** - OpenTelemetry distributed tracing setup
+- **types** - Shared data structures for NTP Pool
+- **ulid** - Thread-safe ULID generation
+- **version** - Build metadata and version information
+- **xff/fastlyxff** - Fastly CDN IP range management
+
+[![Go Reference](https://pkg.go.dev/badge/go.ntppool.org/common.svg)](https://pkg.go.dev/go.ntppool.org/common)

apitls/apitls.go

@@ -1,3 +1,14 @@
+// Package apitls provides TLS certificate management with automatic renewal support.
+//
+// This package handles TLS certificate provisioning and management for secure
+// inter-service communication within the NTP Pool project infrastructure.
+// It provides both server and client certificate management through the
+// CertificateProvider interface and includes a trusted CA certificate pool
+// for validating certificates.
+//
+// The package integrates with certman for automatic certificate renewal
+// and includes embedded CA certificates for establishing trust relationships
+// between services.
 package apitls
 
 import (
@@ -13,11 +24,32 @@ import (
 //go:embed ca.pem
 var caBytes []byte
 
+// CertificateProvider defines the interface for providing TLS certificates
+// for both server and client connections. Implementations should handle
+// certificate retrieval, caching, and renewal as needed.
+//
+// This interface supports both server-side certificate provisioning
+// (via GetCertificate) and client-side certificate authentication
+// (via GetClientCertificate).
 type CertificateProvider interface {
+	// GetCertificate retrieves a server certificate based on the client hello information.
+	// This method is typically used in tls.Config.GetCertificate for server-side TLS.
 	GetCertificate(hello *tls.ClientHelloInfo) (*tls.Certificate, error)
+
+	// GetClientCertificate retrieves a client certificate for mutual TLS authentication.
+	// This method is used in tls.Config.GetClientCertificate for client-side TLS.
 	GetClientCertificate(certRequestInfo *tls.CertificateRequestInfo) (*tls.Certificate, error)
 }
 
+// CAPool returns a certificate pool containing trusted CA certificates
+// for validating TLS connections within the NTP Pool infrastructure.
+//
+// The CA certificates are embedded in the binary and include the trusted
+// certificate authorities used for inter-service communication.
+// This pool should be used in tls.Config.RootCAs for client connections
+// or tls.Config.ClientCAs for server connections requiring client certificates.
+//
+// Returns an error if the embedded CA certificates cannot be parsed or loaded.
 func CAPool() (*x509.CertPool, error) {
 	capool := x509.NewCertPool()
 	if !capool.AppendCertsFromPEM(caBytes) {
@@ -30,7 +62,6 @@ func CAPool() (*x509.CertPool, error) {
 // GetCertman sets up certman for the specified cert / key pair. It is
 // used in the monitor-api and (for now) in the client
 func GetCertman(certFile, keyFile string) (*certman.CertMan, error) {
-
 	cm, err := certman.New(certFile, keyFile)
 	if err != nil {
 		return nil, err

config/config.go

@@ -1,5 +1,18 @@
-// Package config provides NTP Pool specific
+// Package config provides environment-based configuration management for NTP Pool services.
-// configuration tools.
+//
+// This package handles configuration loading from environment variables and provides
+// utilities for constructing URLs for web and management interfaces. It supports
+// deployment-specific settings including hostname configuration, TLS settings,
+// and deployment modes.
+//
+// Configuration is loaded automatically from environment variables:
+//   - deployment_mode: The deployment environment (devel, production, etc.)
+//   - manage_hostname: Hostname for management interface
+//   - web_hostname: Comma-separated list of web hostnames (first is primary)
+//   - manage_tls: Enable TLS for management interface (yes, no, true, false)
+//   - web_tls: Enable TLS for web interface (yes, no, true, false)
+//
+// The package includes code generation for accessor methods using the accessory tool.
 package config
 
 import (
@@ -11,8 +24,11 @@ import (
 	"go.ntppool.org/common/logger"
 )
 
-//go:generate accessory -type Config
+//go:generate go tool github.com/masaushi/accessory -type Config
 
+// Config holds environment-based configuration for NTP Pool services.
+// It manages hostnames, TLS settings, and deployment modes loaded from
+// environment variables. The struct includes code-generated accessor methods.
 type Config struct {
 	deploymentMode string `accessor:"getter"`
 
@@ -26,6 +42,16 @@ type Config struct {
 	valid bool `accessor:"getter"`
 }
 
+// New creates a new Config instance by loading configuration from environment variables.
+// It automatically parses hostnames, TLS settings, and deployment mode from the environment.
+// The configuration is considered valid if at least one web hostname is provided.
+//
+// Environment variables used:
+//   - deployment_mode: Deployment environment identifier
+//   - manage_hostname: Management interface hostname
+//   - web_hostname: Comma-separated web hostnames (first becomes primary)
+//   - manage_tls: Management interface TLS setting
+//   - web_tls: Web interface TLS setting
 func New() *Config {
 	c := Config{}
 	c.deploymentMode = os.Getenv("deployment_mode")
@@ -46,10 +72,30 @@ func New() *Config {
 	return &c
 }
 
+// WebURL constructs a complete URL for the web interface using the primary web hostname.
+// It automatically selects HTTP or HTTPS based on the web_tls configuration setting.
+//
+// Parameters:
+//   - path: URL path component (should start with "/")
+//   - query: Optional URL query parameters (can be nil)
+//
+// Returns a complete URL string suitable for web interface requests.
 func (c *Config) WebURL(path string, query *url.Values) string {
 	return baseURL(c.webHostname, c.webTLS, path, query)
 }
 
+// ManageURL constructs a complete URL for the management interface using the management hostname.
+// It automatically selects HTTP or HTTPS based on the manage_tls configuration setting.
+//
+// Parameters:
+//   - path: URL path component (should start with "/")
+//   - query: Optional URL query parameters (can be nil)
+//
+// Returns a complete URL string suitable for management interface requests.
+func (c *Config) ManageURL(path string, query *url.Values) string {
+	return baseURL(c.manageHostname, c.webTLS, path, query)
+}
+
 func baseURL(host string, tls bool, path string, query *url.Values) string {
 	uri := url.URL{}
 	uri.Host = host

config/config_test.go

@@ -7,7 +7,6 @@ import (
 )
 
 func TestBaseURL(t *testing.T) {
-
 	os.Setenv("web_hostname", "www.ntp.dev, web.ntppool.dev")
 	os.Setenv("web_tls", "yes")
 
@@ -22,5 +21,4 @@ func TestBaseURL(t *testing.T) {
 	if u != "https://www.ntp.dev/foo?foo=bar" {
 		t.Fatalf("unexpected WebURL: %s", u)
 	}
-
 }

config/depenv/context.go

@@ -0,0 +1,18 @@
+package depenv
+
+import "context"
+
+type contextKey struct{}
+
+// NewContext adds the deployment environment to the context
+func NewContext(ctx context.Context, d DeploymentEnvironment) context.Context {
+	return context.WithValue(ctx, contextKey{}, d)
+}
+
+// FromContext retrieves the deployment environment from the context
+func FromContext(ctx context.Context) DeploymentEnvironment {
+	if d, ok := ctx.Value(contextKey{}).(DeploymentEnvironment); ok {
+		return d
+	}
+	return DeployUndefined
+}

config/depenv/depenv.go

@@ -0,0 +1,133 @@
+// Package depenv provides deployment environment management for NTP Pool services.
+//
+// This package handles different deployment environments (development, test, production)
+// and provides environment-specific configuration including API endpoints, management URLs,
+// and monitoring domains. It supports string-based environment identification and
+// automatic URL construction for various service endpoints.
+//
+// The package defines three main deployment environments:
+//   - DeployDevel: Development environment with dev-specific endpoints
+//   - DeployTest: Test/beta environment for staging
+//   - DeployProd: Production environment with live endpoints
+//
+// Environment detection supports both short and long forms:
+//   - "dev" or "devel" → DeployDevel
+//   - "test" or "beta" → DeployTest
+//   - "prod" → DeployProd
+package depenv
+
+import (
+	"fmt"
+	"os"
+)
+
+var manageServers = map[DeploymentEnvironment]string{
+	DeployDevel: "https://manage.askdev.grundclock.com",
+	DeployTest:  "https://manage.beta.grundclock.com",
+	DeployProd:  "https://manage.ntppool.org",
+}
+
+var apiServers = map[DeploymentEnvironment]string{
+	DeployDevel: "https://dev-api.ntppool.dev",
+	DeployTest:  "https://beta-api.ntppool.dev",
+	DeployProd:  "https://api.ntppool.dev",
+}
+
+// var validationServers = map[DeploymentEnvironment]string{
+// 	DeployDevel: "https://v.ntp.dev/d/",
+// 	DeployTest:  "https://v.ntp.dev/b/",
+// 	DeployProd:  "https://v.ntp.dev/p/",
+// }
+
+const (
+	// DeployUndefined represents an unrecognized or unset deployment environment.
+	DeployUndefined DeploymentEnvironment = iota
+	// DeployDevel represents the development environment.
+	DeployDevel
+	// DeployTest represents the test/beta environment.
+	DeployTest
+	// DeployProd represents the production environment.
+	DeployProd
+)
+
+// DeploymentEnvironment represents a deployment environment type.
+// It provides methods for environment-specific URL construction and
+// supports text marshaling/unmarshaling for configuration files.
+type DeploymentEnvironment uint8
+
+// DeploymentEnvironmentFromString parses a string into a DeploymentEnvironment.
+// It supports both short and long forms of environment names:
+//   - "dev" or "devel" → DeployDevel
+//   - "test" or "beta" → DeployTest
+//   - "prod" → DeployProd
+//   - any other value → DeployUndefined
+func DeploymentEnvironmentFromString(s string) DeploymentEnvironment {
+	switch s {
+	case "devel", "dev":
+		return DeployDevel
+	case "test", "beta":
+		return DeployTest
+	case "prod":
+		return DeployProd
+	default:
+		return DeployUndefined
+	}
+}
+
+// String returns the canonical string representation of the deployment environment.
+// Returns "prod", "test", "devel", or panics for invalid environments.
+func (d DeploymentEnvironment) String() string {
+	switch d {
+	case DeployProd:
+		return "prod"
+	case DeployTest:
+		return "test"
+	case DeployDevel:
+		return "devel"
+	default:
+		panic("invalid DeploymentEnvironment")
+	}
+}
+
+// APIHost returns the API server URL for this deployment environment.
+// It first checks the API_HOST environment variable for overrides,
+// then falls back to the environment-specific default API endpoint.
+func (d DeploymentEnvironment) APIHost() string {
+	if apiHost := os.Getenv("API_HOST"); apiHost != "" {
+		return apiHost
+	}
+	return apiServers[d]
+}
+
+// ManageURL constructs a management interface URL for this deployment environment.
+// It combines the environment-specific management server base URL with the provided path.
+//
+// The path parameter should start with "/" for proper URL construction.
+func (d DeploymentEnvironment) ManageURL(path string) string {
+	return manageServers[d] + path
+}
+
+// MonitorDomain returns the monitoring domain for this deployment environment.
+// The domain follows the pattern: {environment}.mon.ntppool.dev
+// For example: "devel.mon.ntppool.dev" for the development environment.
+func (d DeploymentEnvironment) MonitorDomain() string {
+	return d.String() + ".mon.ntppool.dev"
+}
+
+// UnmarshalText implements the encoding.TextUnmarshaler interface.
+// It allows DeploymentEnvironment to be unmarshaled from configuration files
+// and other text-based formats. Empty strings are treated as valid (no-op).
+//
+// Returns an error if the text represents an invalid deployment environment.
+func (d *DeploymentEnvironment) UnmarshalText(text []byte) error {
+	s := string(text)
+	if s == "" {
+		return nil
+	}
+	env := DeploymentEnvironmentFromString(s)
+	if env == DeployUndefined {
+		return fmt.Errorf("invalid deployment environment: %s", s)
+	}
+	*d = env
+	return nil
+}

config/depenv/monitor_names.go

@@ -0,0 +1,40 @@
+package depenv
+
+import (
+	"fmt"
+	"strings"
+)
+
+var monitorApiServers = map[DeploymentEnvironment]string{
+	DeployDevel: "https://api.devel.mon.ntppool.dev",
+	DeployTest:  "https://api.test.mon.ntppool.dev",
+	DeployProd:  "https://api.mon.ntppool.dev",
+}
+
+func (d DeploymentEnvironment) MonitorAPIHost() string {
+	return monitorApiServers[d]
+}
+
+func GetDeploymentEnvironmentFromName(clientName string) (DeploymentEnvironment, error) {
+	clientName = strings.ToLower(clientName)
+
+	if !strings.HasSuffix(clientName, ".mon.ntppool.dev") {
+		return DeployUndefined, fmt.Errorf("invalid client name %s", clientName)
+	}
+
+	if clientName == "api.mon.ntppool.dev" {
+		return DeployProd, nil
+	}
+
+	prefix := clientName[:strings.Index(clientName, ".mon.ntppool.dev")]
+	parts := strings.Split(prefix, ".")
+	if len(parts) != 2 {
+		return DeployUndefined, fmt.Errorf("invalid client name %s", clientName)
+	}
+
+	if d := DeploymentEnvironmentFromString(parts[1]); d != DeployUndefined {
+		return d, nil
+	}
+
+	return DeployUndefined, fmt.Errorf("invalid client name %s (unknown environment %s)", clientName, parts[1])
+}

database/config.go

@@ -0,0 +1,72 @@
+package database
+
+import (
+	"os"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+// Config represents the database configuration structure
+type Config struct {
+	MySQL DBConfig `yaml:"mysql"`
+}
+
+// DBConfig represents the MySQL database configuration
+type DBConfig struct {
+	DSN    string `default:"" flag:"dsn" usage:"Database DSN"`
+	User   string `default:"" flag:"user"`
+	Pass   string `default:"" flag:"pass"`
+	DBName string // Optional database name override
+}
+
+// ConfigOptions allows customization of database opening behavior
+type ConfigOptions struct {
+	// ConfigFiles is a list of config file paths to search for database configuration
+	ConfigFiles []string
+
+	// EnablePoolMonitoring enables connection pool metrics collection
+	EnablePoolMonitoring bool
+
+	// PrometheusRegisterer for metrics collection. If nil, no metrics are collected.
+	PrometheusRegisterer prometheus.Registerer
+
+	// Connection pool settings
+	MaxOpenConns    int
+	MaxIdleConns    int
+	ConnMaxLifetime time.Duration
+}
+
+// getConfigFiles returns the list of config files to search for database configuration.
+// If DATABASE_CONFIG_FILE environment variable is set, it returns that single file.
+// Otherwise, it returns the default paths.
+func getConfigFiles() []string {
+	if configFile := os.Getenv("DATABASE_CONFIG_FILE"); configFile != "" {
+		return []string{configFile}
+	}
+	return []string{"database.yaml", "/vault/secrets/database.yaml"}
+}
+
+// DefaultConfigOptions returns the standard configuration options used by API package
+func DefaultConfigOptions() ConfigOptions {
+	return ConfigOptions{
+		ConfigFiles:          getConfigFiles(),
+		EnablePoolMonitoring: true,
+		PrometheusRegisterer: prometheus.DefaultRegisterer,
+		MaxOpenConns:         25,
+		MaxIdleConns:         10,
+		ConnMaxLifetime:      3 * time.Minute,
+	}
+}
+
+// MonitorConfigOptions returns configuration options optimized for Monitor package
+func MonitorConfigOptions() ConfigOptions {
+	return ConfigOptions{
+		ConfigFiles:          getConfigFiles(),
+		EnablePoolMonitoring: false, // Monitor doesn't need metrics
+		PrometheusRegisterer: nil,   // No Prometheus dependency
+		MaxOpenConns:         10,
+		MaxIdleConns:         5,
+		ConnMaxLifetime:      3 * time.Minute,
+	}
+}

database/config_test.go

@@ -0,0 +1,81 @@
+package database
+
+import (
+	"testing"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+func TestDefaultConfigOptions(t *testing.T) {
+	opts := DefaultConfigOptions()
+
+	// Verify expected defaults for API package
+	if opts.MaxOpenConns != 25 {
+		t.Errorf("Expected MaxOpenConns=25, got %d", opts.MaxOpenConns)
+	}
+	if opts.MaxIdleConns != 10 {
+		t.Errorf("Expected MaxIdleConns=10, got %d", opts.MaxIdleConns)
+	}
+	if opts.ConnMaxLifetime != 3*time.Minute {
+		t.Errorf("Expected ConnMaxLifetime=3m, got %v", opts.ConnMaxLifetime)
+	}
+	if !opts.EnablePoolMonitoring {
+		t.Error("Expected EnablePoolMonitoring=true")
+	}
+	if opts.PrometheusRegisterer != prometheus.DefaultRegisterer {
+		t.Error("Expected PrometheusRegisterer to be DefaultRegisterer")
+	}
+	if len(opts.ConfigFiles) == 0 {
+		t.Error("Expected ConfigFiles to be non-empty")
+	}
+}
+
+func TestMonitorConfigOptions(t *testing.T) {
+	opts := MonitorConfigOptions()
+
+	// Verify expected defaults for Monitor package
+	if opts.MaxOpenConns != 10 {
+		t.Errorf("Expected MaxOpenConns=10, got %d", opts.MaxOpenConns)
+	}
+	if opts.MaxIdleConns != 5 {
+		t.Errorf("Expected MaxIdleConns=5, got %d", opts.MaxIdleConns)
+	}
+	if opts.ConnMaxLifetime != 3*time.Minute {
+		t.Errorf("Expected ConnMaxLifetime=3m, got %v", opts.ConnMaxLifetime)
+	}
+	if opts.EnablePoolMonitoring {
+		t.Error("Expected EnablePoolMonitoring=false")
+	}
+	if opts.PrometheusRegisterer != nil {
+		t.Error("Expected PrometheusRegisterer to be nil")
+	}
+	if len(opts.ConfigFiles) == 0 {
+		t.Error("Expected ConfigFiles to be non-empty")
+	}
+}
+
+func TestConfigStructures(t *testing.T) {
+	// Test that configuration structures can be created and populated
+	config := Config{
+		MySQL: DBConfig{
+			DSN:    "user:pass@tcp(localhost:3306)/dbname",
+			User:   "testuser",
+			Pass:   "testpass",
+			DBName: "testdb",
+		},
+	}
+
+	if config.MySQL.DSN == "" {
+		t.Error("Expected DSN to be set")
+	}
+	if config.MySQL.User != "testuser" {
+		t.Errorf("Expected User='testuser', got '%s'", config.MySQL.User)
+	}
+	if config.MySQL.Pass != "testpass" {
+		t.Errorf("Expected Pass='testpass', got '%s'", config.MySQL.Pass)
+	}
+	if config.MySQL.DBName != "testdb" {
+		t.Errorf("Expected DBName='testdb', got '%s'", config.MySQL.DBName)
+	}
+}

database/connector.go

@@ -0,0 +1,88 @@
+package database
+
+import (
+	"context"
+	"database/sql/driver"
+	"errors"
+	"fmt"
+	"os"
+
+	"github.com/go-sql-driver/mysql"
+	"gopkg.in/yaml.v3"
+)
+
+// from https://github.com/Boostport/dynamic-database-config
+
+// CreateConnectorFunc is a function that creates a database connector
+type CreateConnectorFunc func() (driver.Connector, error)
+
+// Driver implements the sql/driver interface with dynamic configuration
+type Driver struct {
+	CreateConnectorFunc CreateConnectorFunc
+}
+
+// Driver returns the driver instance
+func (d Driver) Driver() driver.Driver {
+	return d
+}
+
+// Connect creates a new database connection using the dynamic connector
+func (d Driver) Connect(ctx context.Context) (driver.Conn, error) {
+	connector, err := d.CreateConnectorFunc()
+	if err != nil {
+		return nil, fmt.Errorf("error creating connector from function: %w", err)
+	}
+
+	return connector.Connect(ctx)
+}
+
+// Open is not supported for dynamic configuration
+func (d Driver) Open(name string) (driver.Conn, error) {
+	return nil, errors.New("open is not supported")
+}
+
+// createConnector creates a connector function that reads configuration from a file
+func createConnector(configFile string) CreateConnectorFunc {
+	return func() (driver.Connector, error) {
+		dbFile, err := os.Open(configFile)
+		if err != nil {
+			return nil, err
+		}
+		defer dbFile.Close()
+
+		dec := yaml.NewDecoder(dbFile)
+		cfg := Config{}
+
+		err = dec.Decode(&cfg)
+		if err != nil {
+			return nil, err
+		}
+
+		dsn := cfg.MySQL.DSN
+		if len(dsn) == 0 {
+			dsn = os.Getenv("DATABASE_DSN")
+			if len(dsn) == 0 {
+				return nil, fmt.Errorf("dsn config in database.yaml or DATABASE_DSN environment variable required")
+			}
+		}
+
+		dbcfg, err := mysql.ParseDSN(dsn)
+		if err != nil {
+			return nil, err
+		}
+
+		if user := cfg.MySQL.User; len(user) > 0 {
+			dbcfg.User = user
+		}
+
+		if pass := cfg.MySQL.Pass; len(pass) > 0 {
+			dbcfg.Passwd = pass
+		}
+
+		if name := cfg.MySQL.DBName; len(name) > 0 {
+			dbcfg.DBName = name
+		}
+
+		return mysql.NewConnector(dbcfg)
+	}
+}

database/integration_test.go

@@ -0,0 +1,117 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+	"testing"
+)
+
+// Mock types for testing SQLC integration patterns
+type mockQueries struct {
+	db DBTX
+}
+
+type mockQueriesTx struct {
+	*mockQueries
+	tx *sql.Tx
+}
+
+// Mock the Begin method pattern that SQLC generates
+func (q *mockQueries) Begin(ctx context.Context) (*mockQueriesTx, error) {
+	// This would normally be: tx, err := q.db.(*sql.DB).BeginTx(ctx, nil)
+	// For our test, we return a mock
+	return &mockQueriesTx{mockQueries: q, tx: nil}, nil
+}
+
+func (qtx *mockQueriesTx) Commit(ctx context.Context) error {
+	return nil // Mock implementation
+}
+
+func (qtx *mockQueriesTx) Rollback(ctx context.Context) error {
+	return nil // Mock implementation
+}
+
+// This test verifies that our common database interfaces are compatible with SQLC-generated code
+func TestSQLCIntegration(t *testing.T) {
+	// Test that SQLC's DBTX interface matches our DBTX interface
+	t.Run("DBTX Interface Compatibility", func(t *testing.T) {
+		// Test interface compatibility by assignment without execution
+		var ourDBTX DBTX
+
+		// Test with sql.DB (should implement DBTX)
+		var db *sql.DB
+		ourDBTX = db // This will compile only if interfaces are compatible
+		_ = ourDBTX  // Use the variable to avoid "unused" warning
+
+		// Test with sql.Tx (should implement DBTX)
+		var tx *sql.Tx
+		ourDBTX = tx // This will compile only if interfaces are compatible
+		_ = ourDBTX  // Use the variable to avoid "unused" warning
+
+		// If we reach here, interfaces are compatible
+		t.Log("DBTX interface is compatible with sql.DB and sql.Tx")
+	})
+
+	t.Run("Transaction Interface Compatibility", func(t *testing.T) {
+		// This test verifies our transaction interfaces work with SQLC patterns
+		// We can't define methods inside a function, so we test interface compatibility
+
+		// Verify our DB interface is compatible with what SQLC expects
+		var dbInterface DB[*mockQueriesTx]
+		var mockDB *mockQueries = &mockQueries{}
+		dbInterface = mockDB
+
+		// Test that our transaction helper can work with this pattern
+		err := WithTransaction(context.Background(), dbInterface, func(ctx context.Context, qtx *mockQueriesTx) error {
+			// This would be where you'd call SQLC-generated query methods
+			return nil
+		})
+		if err != nil {
+			t.Errorf("Transaction helper failed: %v", err)
+		}
+	})
+}
+
+// Test that demonstrates how the common package would be used with real SQLC patterns
+func TestRealWorldUsagePattern(t *testing.T) {
+	// This test shows how a package would typically use our common database code
+
+	t.Run("Database Opening Pattern", func(t *testing.T) {
+		// Test that our configuration options work as expected
+		opts := DefaultConfigOptions()
+
+		// Modify for test environment (no actual database connection)
+		opts.ConfigFiles = []string{}   // No config files for unit test
+		opts.PrometheusRegisterer = nil // No metrics for unit test
+
+		// This would normally open a database: db, err := OpenDB(ctx, opts)
+		// For our unit test, we just verify the options are reasonable
+		if opts.MaxOpenConns <= 0 {
+			t.Error("MaxOpenConns should be positive")
+		}
+		if opts.MaxIdleConns <= 0 {
+			t.Error("MaxIdleConns should be positive")
+		}
+		if opts.ConnMaxLifetime <= 0 {
+			t.Error("ConnMaxLifetime should be positive")
+		}
+	})
+
+	t.Run("Monitor Package Configuration", func(t *testing.T) {
+		opts := MonitorConfigOptions()
+
+		// Verify monitor-specific settings
+		if opts.EnablePoolMonitoring {
+			t.Error("Monitor package should not enable pool monitoring")
+		}
+		if opts.PrometheusRegisterer != nil {
+			t.Error("Monitor package should not have Prometheus registerer")
+		}
+		if opts.MaxOpenConns != 10 {
+			t.Errorf("Expected MaxOpenConns=10 for monitor, got %d", opts.MaxOpenConns)
+		}
+		if opts.MaxIdleConns != 5 {
+			t.Errorf("Expected MaxIdleConns=5 for monitor, got %d", opts.MaxIdleConns)
+		}
+	})
+}

database/interfaces.go

@@ -0,0 +1,34 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+)
+
+// DBTX matches the interface expected by SQLC-generated code
+// This interface is implemented by both *sql.DB and *sql.Tx
+type DBTX interface {
+	ExecContext(context.Context, string, ...interface{}) (sql.Result, error)
+	PrepareContext(context.Context, string) (*sql.Stmt, error)
+	QueryContext(context.Context, string, ...interface{}) (*sql.Rows, error)
+	QueryRowContext(context.Context, string, ...interface{}) *sql.Row
+}
+
+// BaseQuerier provides basic query functionality
+// This interface should be implemented by package-specific Queries types
+type BaseQuerier interface {
+	WithTx(tx *sql.Tx) BaseQuerier
+}
+
+// BaseQuerierTx provides transaction functionality
+// This interface should be implemented by package-specific Queries types
+type BaseQuerierTx interface {
+	BaseQuerier
+	Begin(ctx context.Context) (BaseQuerierTx, error)
+	Commit(ctx context.Context) error
+	Rollback(ctx context.Context) error
+}
+
+// TransactionFunc represents a function that operates within a database transaction
+// This is used by the shared transaction helpers in transaction.go
+type TransactionFunc[Q any] func(ctx context.Context, q Q) error

database/metrics.go

@@ -0,0 +1,93 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+// DatabaseMetrics holds the Prometheus metrics for database connection pool monitoring
+type DatabaseMetrics struct {
+	ConnectionsOpen         prometheus.Gauge
+	ConnectionsIdle         prometheus.Gauge
+	ConnectionsInUse        prometheus.Gauge
+	ConnectionsWaitCount    prometheus.Counter
+	ConnectionsWaitDuration prometheus.Histogram
+}
+
+// NewDatabaseMetrics creates a new set of database metrics and registers them
+func NewDatabaseMetrics(registerer prometheus.Registerer) *DatabaseMetrics {
+	metrics := &DatabaseMetrics{
+		ConnectionsOpen: prometheus.NewGauge(prometheus.GaugeOpts{
+			Name: "database_connections_open",
+			Help: "Number of open database connections",
+		}),
+		ConnectionsIdle: prometheus.NewGauge(prometheus.GaugeOpts{
+			Name: "database_connections_idle",
+			Help: "Number of idle database connections",
+		}),
+		ConnectionsInUse: prometheus.NewGauge(prometheus.GaugeOpts{
+			Name: "database_connections_in_use",
+			Help: "Number of database connections in use",
+		}),
+		ConnectionsWaitCount: prometheus.NewCounter(prometheus.CounterOpts{
+			Name: "database_connections_wait_count_total",
+			Help: "Total number of times a connection had to wait",
+		}),
+		ConnectionsWaitDuration: prometheus.NewHistogram(prometheus.HistogramOpts{
+			Name:    "database_connections_wait_duration_seconds",
+			Help:    "Time spent waiting for a database connection",
+			Buckets: prometheus.DefBuckets,
+		}),
+	}
+
+	if registerer != nil {
+		registerer.MustRegister(
+			metrics.ConnectionsOpen,
+			metrics.ConnectionsIdle,
+			metrics.ConnectionsInUse,
+			metrics.ConnectionsWaitCount,
+			metrics.ConnectionsWaitDuration,
+		)
+	}
+
+	return metrics
+}
+
+// monitorConnectionPool runs a background goroutine to collect connection pool metrics
+func monitorConnectionPool(ctx context.Context, db *sql.DB, registerer prometheus.Registerer) {
+	if registerer == nil {
+		return // No metrics collection if no registerer provided
+	}
+
+	metrics := NewDatabaseMetrics(registerer)
+	ticker := time.NewTicker(30 * time.Second)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-ticker.C:
+			stats := db.Stats()
+
+			metrics.ConnectionsOpen.Set(float64(stats.OpenConnections))
+			metrics.ConnectionsIdle.Set(float64(stats.Idle))
+			metrics.ConnectionsInUse.Set(float64(stats.InUse))
+			metrics.ConnectionsWaitCount.Add(float64(stats.WaitCount))
+
+			if stats.WaitDuration > 0 {
+				metrics.ConnectionsWaitDuration.Observe(stats.WaitDuration.Seconds())
+			}
+
+			// Log connection pool stats for high usage or waiting
+			if stats.OpenConnections > 20 || stats.WaitCount > 0 {
+				fmt.Printf("Connection pool stats: open=%d idle=%d in_use=%d wait_count=%d wait_duration=%s\n",
+					stats.OpenConnections, stats.Idle, stats.InUse, stats.WaitCount, stats.WaitDuration)
+			}
+		}
+	}
+}

database/pool.go

@@ -0,0 +1,78 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+	"os"
+
+	"go.ntppool.org/common/logger"
+)
+
+// OpenDB opens a database connection with the specified configuration options
+func OpenDB(ctx context.Context, options ConfigOptions) (*sql.DB, error) {
+	log := logger.Setup()
+
+	configFile, err := findConfigFile(options.ConfigFiles)
+	if err != nil {
+		return nil, err
+	}
+
+	dbconn := sql.OpenDB(Driver{
+		CreateConnectorFunc: createConnector(configFile),
+	})
+
+	// Set connection pool parameters
+	dbconn.SetConnMaxLifetime(options.ConnMaxLifetime)
+	dbconn.SetMaxOpenConns(options.MaxOpenConns)
+	dbconn.SetMaxIdleConns(options.MaxIdleConns)
+
+	err = dbconn.Ping()
+	if err != nil {
+		log.Error("could not connect to database", "err", err)
+		return nil, err
+	}
+
+	// Start optional connection pool monitoring
+	if options.EnablePoolMonitoring && options.PrometheusRegisterer != nil {
+		go monitorConnectionPool(ctx, dbconn, options.PrometheusRegisterer)
+	}
+
+	return dbconn, nil
+}
+
+// OpenDBWithConfigFile opens a database connection using an explicit config file path
+// This is a convenience function for API package compatibility
+func OpenDBWithConfigFile(ctx context.Context, configFile string) (*sql.DB, error) {
+	options := DefaultConfigOptions()
+	options.ConfigFiles = []string{configFile}
+	return OpenDB(ctx, options)
+}
+
+// OpenDBMonitor opens a database connection with monitor-specific defaults
+// This is a convenience function for Monitor package compatibility
+func OpenDBMonitor() (*sql.DB, error) {
+	options := MonitorConfigOptions()
+	return OpenDB(context.Background(), options)
+}
+
+// findConfigFile searches for the first existing config file from the list
+func findConfigFile(configFiles []string) (string, error) {
+	var firstErr error
+
+	for _, configFile := range configFiles {
+		if configFile == "" {
+			continue
+		}
+		if _, err := os.Stat(configFile); err == nil {
+			return configFile, nil
+		} else if firstErr == nil {
+			firstErr = err
+		}
+	}
+
+	if firstErr != nil {
+		return "", fmt.Errorf("no config file found: %w", firstErr)
+	}
+	return "", fmt.Errorf("no valid config files provided")
+}

database/transaction.go

@@ -0,0 +1,69 @@
+package database
+
+import (
+	"context"
+	"fmt"
+
+	"go.ntppool.org/common/logger"
+)
+
+// DB interface for database operations that can begin transactions
+type DB[Q any] interface {
+	Begin(ctx context.Context) (Q, error)
+}
+
+// TX interface for transaction operations
+type TX interface {
+	Commit(ctx context.Context) error
+	Rollback(ctx context.Context) error
+}
+
+// WithTransaction executes a function within a database transaction
+// Handles proper rollback on error and commit on success
+func WithTransaction[Q TX](ctx context.Context, db DB[Q], fn func(ctx context.Context, q Q) error) error {
+	tx, err := db.Begin(ctx)
+	if err != nil {
+		return fmt.Errorf("failed to begin transaction: %w", err)
+	}
+
+	var committed bool
+	defer func() {
+		if !committed {
+			if rbErr := tx.Rollback(ctx); rbErr != nil {
+				// Log rollback error but don't override original error
+				log := logger.FromContext(ctx)
+				log.ErrorContext(ctx, "failed to rollback transaction", "error", rbErr)
+			}
+		}
+	}()
+
+	if err := fn(ctx, tx); err != nil {
+		return err
+	}
+
+	err = tx.Commit(ctx)
+	committed = true // Mark as committed regardless of commit success/failure
+	if err != nil {
+		return fmt.Errorf("failed to commit transaction: %w", err)
+	}
+
+	return nil
+}
+
+// WithReadOnlyTransaction executes a read-only function within a transaction
+// Always rolls back at the end (for consistent read isolation)
+func WithReadOnlyTransaction[Q TX](ctx context.Context, db DB[Q], fn func(ctx context.Context, q Q) error) error {
+	tx, err := db.Begin(ctx)
+	if err != nil {
+		return fmt.Errorf("failed to begin read-only transaction: %w", err)
+	}
+
+	defer func() {
+		if rbErr := tx.Rollback(ctx); rbErr != nil {
+			log := logger.FromContext(ctx)
+			log.ErrorContext(ctx, "failed to rollback read-only transaction", "error", rbErr)
+		}
+	}()
+
+	return fn(ctx, tx)
+}

database/transaction_base.go

@@ -0,0 +1,69 @@
+package database
+
+import (
+	"context"
+	"database/sql"
+	"fmt"
+
+	"go.ntppool.org/common/logger"
+)
+
+// Shared interface definitions that both packages use identically
+type BaseBeginner interface {
+	Begin(context.Context) (sql.Tx, error)
+}
+
+type BaseTx interface {
+	BaseBeginner
+	Commit(ctx context.Context) error
+	Rollback(ctx context.Context) error
+}
+
+// BeginTransactionForQuerier contains the shared Begin() logic from both packages
+func BeginTransactionForQuerier(ctx context.Context, db DBTX) (DBTX, error) {
+	if sqlDB, ok := db.(*sql.DB); ok {
+		tx, err := sqlDB.BeginTx(ctx, &sql.TxOptions{})
+		if err != nil {
+			return nil, err
+		}
+		return tx, nil
+	} else {
+		// Handle transaction case
+		if beginner, ok := db.(BaseBeginner); ok {
+			tx, err := beginner.Begin(ctx)
+			if err != nil {
+				return nil, err
+			}
+			return &tx, nil
+		}
+		return nil, fmt.Errorf("database connection does not support transactions")
+	}
+}
+
+// CommitTransactionForQuerier contains the shared Commit() logic from both packages
+func CommitTransactionForQuerier(ctx context.Context, db DBTX) error {
+	if sqlTx, ok := db.(*sql.Tx); ok {
+		return sqlTx.Commit()
+	}
+
+	tx, ok := db.(BaseTx)
+	if !ok {
+		log := logger.FromContext(ctx)
+		log.ErrorContext(ctx, "could not get a Tx", "type", fmt.Sprintf("%T", db))
+		return sql.ErrTxDone
+	}
+	return tx.Commit(ctx)
+}
+
+// RollbackTransactionForQuerier contains the shared Rollback() logic from both packages
+func RollbackTransactionForQuerier(ctx context.Context, db DBTX) error {
+	if sqlTx, ok := db.(*sql.Tx); ok {
+		return sqlTx.Rollback()
+	}
+
+	tx, ok := db.(BaseTx)
+	if !ok {
+		return sql.ErrTxDone
+	}
+	return tx.Rollback(ctx)
+}

database/transaction_test.go

@@ -0,0 +1,157 @@
+package database
+
+import (
+	"context"
+	"errors"
+	"testing"
+)
+
+// Mock implementations for testing
+type mockDB struct {
+	beginError error
+	txMock     *mockTX
+}
+
+func (m *mockDB) Begin(ctx context.Context) (*mockTX, error) {
+	if m.beginError != nil {
+		return nil, m.beginError
+	}
+	return m.txMock, nil
+}
+
+type mockTX struct {
+	commitError    error
+	rollbackError  error
+	commitCalled   bool
+	rollbackCalled bool
+}
+
+func (m *mockTX) Commit(ctx context.Context) error {
+	m.commitCalled = true
+	return m.commitError
+}
+
+func (m *mockTX) Rollback(ctx context.Context) error {
+	m.rollbackCalled = true
+	return m.rollbackError
+}
+
+func TestWithTransaction_Success(t *testing.T) {
+	tx := &mockTX{}
+	db := &mockDB{txMock: tx}
+
+	var functionCalled bool
+	err := WithTransaction(context.Background(), db, func(ctx context.Context, q *mockTX) error {
+		functionCalled = true
+		if q != tx {
+			t.Error("Expected transaction to be passed to function")
+		}
+		return nil
+	})
+	if err != nil {
+		t.Errorf("Expected no error, got %v", err)
+	}
+	if !functionCalled {
+		t.Error("Expected function to be called")
+	}
+	if !tx.commitCalled {
+		t.Error("Expected commit to be called")
+	}
+	if tx.rollbackCalled {
+		t.Error("Expected rollback NOT to be called on success")
+	}
+}
+
+func TestWithTransaction_FunctionError(t *testing.T) {
+	tx := &mockTX{}
+	db := &mockDB{txMock: tx}
+
+	expectedError := errors.New("function error")
+	err := WithTransaction(context.Background(), db, func(ctx context.Context, q *mockTX) error {
+		return expectedError
+	})
+
+	if err != expectedError {
+		t.Errorf("Expected error %v, got %v", expectedError, err)
+	}
+	if tx.commitCalled {
+		t.Error("Expected commit NOT to be called on function error")
+	}
+	if !tx.rollbackCalled {
+		t.Error("Expected rollback to be called on function error")
+	}
+}
+
+func TestWithTransaction_BeginError(t *testing.T) {
+	expectedError := errors.New("begin error")
+	db := &mockDB{beginError: expectedError}
+
+	err := WithTransaction(context.Background(), db, func(ctx context.Context, q *mockTX) error {
+		t.Error("Function should not be called when Begin fails")
+		return nil
+	})
+
+	if err == nil || !errors.Is(err, expectedError) {
+		t.Errorf("Expected wrapped begin error, got %v", err)
+	}
+}
+
+func TestWithTransaction_CommitError(t *testing.T) {
+	commitError := errors.New("commit error")
+	tx := &mockTX{commitError: commitError}
+	db := &mockDB{txMock: tx}
+
+	err := WithTransaction(context.Background(), db, func(ctx context.Context, q *mockTX) error {
+		return nil
+	})
+
+	if err == nil || !errors.Is(err, commitError) {
+		t.Errorf("Expected wrapped commit error, got %v", err)
+	}
+	if !tx.commitCalled {
+		t.Error("Expected commit to be called")
+	}
+	if tx.rollbackCalled {
+		t.Error("Expected rollback NOT to be called when commit fails")
+	}
+}
+
+func TestWithReadOnlyTransaction_Success(t *testing.T) {
+	tx := &mockTX{}
+	db := &mockDB{txMock: tx}
+
+	var functionCalled bool
+	err := WithReadOnlyTransaction(context.Background(), db, func(ctx context.Context, q *mockTX) error {
+		functionCalled = true
+		return nil
+	})
+	if err != nil {
+		t.Errorf("Expected no error, got %v", err)
+	}
+	if !functionCalled {
+		t.Error("Expected function to be called")
+	}
+	if tx.commitCalled {
+		t.Error("Expected commit NOT to be called in read-only transaction")
+	}
+	if !tx.rollbackCalled {
+		t.Error("Expected rollback to be called in read-only transaction")
+	}
+}
+
+func TestWithReadOnlyTransaction_FunctionError(t *testing.T) {
+	tx := &mockTX{}
+	db := &mockDB{txMock: tx}
+
+	expectedError := errors.New("function error")
+	err := WithReadOnlyTransaction(context.Background(), db, func(ctx context.Context, q *mockTX) error {
+		return expectedError
+	})
+
+	if err != expectedError {
+		t.Errorf("Expected error %v, got %v", expectedError, err)
+	}
+	if !tx.rollbackCalled {
+		t.Error("Expected rollback to be called")
+	}
+}

ekko/ekko.go

@@ -0,0 +1,230 @@
+// Package ekko provides an enhanced Echo web framework wrapper with pre-configured middleware.
+//
+// This package wraps the Echo web framework with a comprehensive middleware stack including:
+//   - OpenTelemetry distributed tracing with request context propagation
+//   - Prometheus metrics collection with per-service subsystems
+//   - Structured logging with trace ID correlation
+//   - Security headers (HSTS, content security policy)
+//   - Gzip compression for response optimization
+//   - Recovery middleware with detailed error logging
+//   - HTTP/2 support with H2C (HTTP/2 Cleartext) capability
+//
+// The package uses functional options pattern for flexible configuration
+// and supports graceful shutdown with configurable timeouts. It's designed
+// as the standard web service foundation for NTP Pool project services.
+//
+// Example usage:
+//
+//	ekko, err := ekko.New("myservice",
+//		ekko.WithPort(8080),
+//		ekko.WithPrometheus(prometheus.DefaultRegisterer),
+//		ekko.WithEchoSetup(func(e *echo.Echo) error {
+//			e.GET("/health", healthHandler)
+//			return nil
+//		}),
+//	)
+//	if err != nil {
+//		log.Fatal(err)
+//	}
+//	err = ekko.Start(ctx)
+package ekko
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"net/http"
+	"time"
+
+	"github.com/labstack/echo-contrib/echoprometheus"
+	"github.com/labstack/echo/v4"
+	"github.com/labstack/echo/v4/middleware"
+	slogecho "github.com/samber/slog-echo"
+	"go.ntppool.org/common/logger"
+	"go.ntppool.org/common/version"
+	"go.opentelemetry.io/contrib/instrumentation/github.com/labstack/echo/otelecho"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/trace"
+	"golang.org/x/net/http2"
+	"golang.org/x/sync/errgroup"
+)
+
+// New creates a new Ekko instance with the specified service name and functional options.
+// The name parameter is used for OpenTelemetry service identification, Prometheus metrics
+// subsystem naming, and server identification headers.
+//
+// Default configuration includes:
+//   - 60 second write timeout
+//   - 30 second read header timeout
+//   - HTTP/2 support with H2C
+//   - Standard middleware stack (tracing, metrics, logging, security)
+//
+// Use functional options to customize behavior:
+//   - WithPort(): Set server port (required for Start())
+//   - WithPrometheus(): Enable Prometheus metrics
+//   - WithEchoSetup(): Configure routes and handlers
+//   - WithLogFilters(): Filter access logs
+//   - WithOtelMiddleware(): Custom OpenTelemetry middleware
+//   - WithWriteTimeout(): Custom write timeout
+//   - WithReadHeaderTimeout(): Custom read header timeout
+//   - WithGzipConfig(): Custom gzip compression settings
+func New(name string, options ...func(*Ekko)) (*Ekko, error) {
+	ek := &Ekko{
+		writeTimeout:      60 * time.Second,
+		readHeaderTimeout: 30 * time.Second,
+	}
+
+	for _, o := range options {
+		o(ek)
+	}
+	return ek, nil
+}
+
+// SetupEcho creates and configures an Echo instance without starting the server.
+// This method is primarily intended for testing scenarios where you need access
+// to the configured Echo instance without starting the HTTP server.
+//
+// The returned Echo instance includes all configured middleware and routes
+// but requires manual server lifecycle management.
+func (ek *Ekko) SetupEcho(ctx context.Context) (*echo.Echo, error) {
+	return ek.setup(ctx)
+}
+
+// Start creates the Echo instance and starts the HTTP server with graceful shutdown support.
+// The server runs until either an error occurs or the provided context is cancelled.
+//
+// The server supports HTTP/2 with H2C (HTTP/2 Cleartext) and includes a 5-second
+// graceful shutdown timeout when the context is cancelled. Server configuration
+// (port, timeouts, middleware) must be set via functional options during New().
+//
+// Returns an error if server startup fails or if shutdown doesn't complete within
+// the timeout period. Returns nil for clean shutdown via context cancellation.
+func (ek *Ekko) Start(ctx context.Context) error {
+	log := logger.Setup()
+
+	e, err := ek.setup(ctx)
+	if err != nil {
+		return err
+	}
+
+	g, ctx := errgroup.WithContext(ctx)
+	g.Go(func() error {
+		e.Server.Addr = fmt.Sprintf(":%d", ek.port)
+		log.Info("server starting", "port", ek.port)
+		// err := e.Server.ListenAndServe()
+		err := e.StartH2CServer(e.Server.Addr, &http2.Server{})
+		if err == http.ErrServerClosed {
+			return nil
+		}
+		return err
+	})
+
+	g.Go(func() error {
+		<-ctx.Done()
+		shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		defer cancel()
+		return e.Shutdown(shutdownCtx)
+	})
+
+	return g.Wait()
+}
+
+func (ek *Ekko) setup(ctx context.Context) (*echo.Echo, error) {
+	log := logger.Setup()
+
+	e := echo.New()
+
+	e.Server.ReadHeaderTimeout = ek.readHeaderTimeout
+	e.Server.WriteTimeout = ek.writeTimeout
+
+	e.Server.BaseContext = func(_ net.Listener) context.Context {
+		return ctx
+	}
+
+	trustOptions := []echo.TrustOption{
+		echo.TrustLoopback(true),
+		echo.TrustLinkLocal(false),
+		echo.TrustPrivateNet(true),
+	}
+	e.IPExtractor = echo.ExtractIPFromXFFHeader(trustOptions...)
+
+	if ek.otelmiddleware == nil {
+		e.Use(otelecho.Middleware(ek.name))
+	} else {
+		e.Use(ek.otelmiddleware)
+	}
+
+	e.Use(middleware.RecoverWithConfig(middleware.RecoverConfig{
+		LogErrorFunc: func(c echo.Context, err error, stack []byte) error {
+			log.ErrorContext(c.Request().Context(), err.Error(), "stack", string(stack))
+			fmt.Println(string(stack))
+			return err
+		},
+	}))
+
+	e.Use(slogecho.NewWithConfig(log,
+		slogecho.Config{
+			WithTraceID: false, // done by logger already
+			Filters:     ek.logFilters,
+		},
+	))
+
+	if ek.prom != nil {
+		e.Use(echoprometheus.NewMiddlewareWithConfig(echoprometheus.MiddlewareConfig{
+			Subsystem:  ek.name,
+			Registerer: ek.prom,
+		}))
+	}
+
+	if ek.gzipConfig != nil {
+		e.Use(middleware.GzipWithConfig(*ek.gzipConfig))
+	} else {
+		e.Use(middleware.Gzip())
+	}
+
+	secureConfig := middleware.DefaultSecureConfig
+	// secureConfig.ContentSecurityPolicy = "default-src *"
+	secureConfig.ContentSecurityPolicy = ""
+	secureConfig.HSTSMaxAge = int(time.Hour * 168 * 30 / time.Second)
+	secureConfig.HSTSPreloadEnabled = true
+
+	e.Use(middleware.SecureWithConfig(secureConfig))
+
+	e.Use(
+		func(next echo.HandlerFunc) echo.HandlerFunc {
+			return func(c echo.Context) error {
+				request := c.Request()
+
+				span := trace.SpanFromContext(request.Context())
+				if span.IsRecording() {
+
+					span.SetAttributes(attribute.String("http.real_ip", c.RealIP()))
+					span.SetAttributes(attribute.String("url.path", c.Request().RequestURI))
+					if q := c.QueryString(); len(q) > 0 {
+						span.SetAttributes(attribute.String("url.query", q))
+					}
+					c.Response().Header().Set("Traceparent", span.SpanContext().TraceID().String())
+				}
+				return next(c)
+			}
+		},
+	)
+
+	e.Use(func(next echo.HandlerFunc) echo.HandlerFunc {
+		vinfo := version.VersionInfo()
+		v := ek.name + "/" + vinfo.Version + "+" + vinfo.GitRevShort
+		return func(c echo.Context) error {
+			c.Response().Header().Set(echo.HeaderServer, v)
+			return next(c)
+		}
+	})
+
+	if ek.routeFn != nil {
+		err := ek.routeFn(e)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return e, nil
+}

ekko/options.go

@@ -0,0 +1,102 @@
+package ekko
+
+import (
+	"time"
+
+	"github.com/labstack/echo/v4"
+	"github.com/labstack/echo/v4/middleware"
+	"github.com/prometheus/client_golang/prometheus"
+	slogecho "github.com/samber/slog-echo"
+)
+
+// Ekko represents an enhanced Echo web server with pre-configured middleware stack.
+// It encapsulates server configuration, middleware options, and lifecycle management
+// for NTP Pool web services. Use New() with functional options to configure.
+type Ekko struct {
+	name           string
+	prom           prometheus.Registerer
+	port           int
+	routeFn        func(e *echo.Echo) error
+	logFilters     []slogecho.Filter
+	otelmiddleware echo.MiddlewareFunc
+	gzipConfig     *middleware.GzipConfig
+
+	writeTimeout      time.Duration
+	readHeaderTimeout time.Duration
+}
+
+// RouteFn defines a function type for configuring Echo routes and handlers.
+// It receives a configured Echo instance and should register all application
+// routes, middleware, and handlers. Return an error to abort server startup.
+type RouteFn func(e *echo.Echo) error
+
+// WithPort sets the HTTP server port. This option is required when using Start().
+// The port should be available and the process should have permission to bind to it.
+func WithPort(port int) func(*Ekko) {
+	return func(ek *Ekko) {
+		ek.port = port
+	}
+}
+
+// WithPrometheus enables Prometheus metrics collection using the provided registerer.
+// Metrics include HTTP request duration, request count, and response size histograms.
+// The service name is used as the metrics subsystem for namespacing.
+func WithPrometheus(reg prometheus.Registerer) func(*Ekko) {
+	return func(ek *Ekko) {
+		ek.prom = reg
+	}
+}
+
+// WithEchoSetup configures application routes and handlers via a setup function.
+// The provided function receives the configured Echo instance after all middleware
+// is applied and should register routes, custom middleware, and handlers.
+func WithEchoSetup(rfn RouteFn) func(*Ekko) {
+	return func(ek *Ekko) {
+		ek.routeFn = rfn
+	}
+}
+
+// WithLogFilters configures access log filtering to reduce log noise.
+// Filters can exclude specific paths, methods, or status codes from access logs.
+// Useful for excluding health checks, metrics endpoints, and other high-frequency requests.
+func WithLogFilters(f []slogecho.Filter) func(*Ekko) {
+	return func(ek *Ekko) {
+		ek.logFilters = f
+	}
+}
+
+// WithOtelMiddleware replaces the default OpenTelemetry middleware with a custom implementation.
+// The default middleware provides distributed tracing for all requests. Use this option
+// when you need custom trace configuration or want to disable tracing entirely.
+func WithOtelMiddleware(mw echo.MiddlewareFunc) func(*Ekko) {
+	return func(ek *Ekko) {
+		ek.otelmiddleware = mw
+	}
+}
+
+// WithWriteTimeout configures the HTTP server write timeout.
+// This is the maximum duration before timing out writes of the response.
+// Default is 60 seconds. Should be longer than expected response generation time.
+func WithWriteTimeout(t time.Duration) func(*Ekko) {
+	return func(ek *Ekko) {
+		ek.writeTimeout = t
+	}
+}
+
+// WithReadHeaderTimeout configures the HTTP server read header timeout.
+// This is the amount of time allowed to read request headers.
+// Default is 30 seconds. Should be sufficient for slow clients and large headers.
+func WithReadHeaderTimeout(t time.Duration) func(*Ekko) {
+	return func(ek *Ekko) {
+		ek.readHeaderTimeout = t
+	}
+}
+
+// WithGzipConfig provides custom gzip compression configuration.
+// By default, gzip compression is enabled with standard settings.
+// Use this option to customize compression level, skip patterns, or disable compression.
+func WithGzipConfig(gzipConfig *middleware.GzipConfig) func(*Ekko) {
+	return func(ek *Ekko) {
+		ek.gzipConfig = gzipConfig
+	}
+}

go.mod

@@ -1,54 +1,80 @@
 module go.ntppool.org/common
 
-go 1.22.2
+go 1.23.5
 
 require (
 	github.com/abh/certman v0.4.0
-	github.com/labstack/echo/v4 v4.11.4
+	github.com/go-sql-driver/mysql v1.9.3
+	github.com/labstack/echo-contrib v0.17.2
+	github.com/labstack/echo/v4 v4.13.3
 	github.com/oklog/ulid/v2 v2.1.0
-	github.com/prometheus/client_golang v1.19.0
+	github.com/prometheus/client_golang v1.20.5
-	github.com/remychantenay/slog-otel v1.3.0
+	github.com/prometheus/client_model v0.6.1
+	github.com/remychantenay/slog-otel v1.3.2
+	github.com/samber/slog-echo v1.14.8
+	github.com/samber/slog-multi v1.2.4
 	github.com/segmentio/kafka-go v0.4.47
-	github.com/spf13/cobra v1.8.0
+	github.com/spf13/cobra v1.8.1
-	go.opentelemetry.io/otel v1.24.0
+	go.opentelemetry.io/contrib/bridges/otelslog v0.8.0
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.24.0
+	go.opentelemetry.io/contrib/exporters/autoexport v0.58.0
-	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.24.0
+	go.opentelemetry.io/contrib/instrumentation/github.com/labstack/echo/otelecho v0.58.0
-	go.opentelemetry.io/otel/sdk v1.24.0
+	go.opentelemetry.io/otel v1.33.0
-	go.opentelemetry.io/otel/trace v1.24.0
+	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc v0.9.0
-	golang.org/x/mod v0.17.0
+	go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp v0.9.0
-	golang.org/x/sync v0.7.0
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v1.33.0
+	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v1.33.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.33.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.33.0
+	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.33.0
+	go.opentelemetry.io/otel/log v0.9.0
+	go.opentelemetry.io/otel/metric v1.33.0
+	go.opentelemetry.io/otel/sdk v1.33.0
+	go.opentelemetry.io/otel/sdk/log v0.9.0
+	go.opentelemetry.io/otel/sdk/metric v1.33.0
+	go.opentelemetry.io/otel/trace v1.33.0
+	golang.org/x/mod v0.22.0
+	golang.org/x/net v0.33.0
+	golang.org/x/sync v0.10.0
+	google.golang.org/grpc v1.69.2
+	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
+	filippo.io/edwards25519 v1.1.0 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cenkalti/backoff/v4 v4.3.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
-	github.com/fsnotify/fsnotify v1.7.0 // indirect
+	github.com/fsnotify/fsnotify v1.8.0 // indirect
-	github.com/go-logr/logr v1.4.1 // indirect
+	github.com/go-logr/logr v1.4.2 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
-	github.com/golang/protobuf v1.5.4 // indirect
+	github.com/google/uuid v1.6.0 // indirect
-	github.com/grpc-ecosystem/grpc-gateway/v2 v2.19.1 // indirect
+	github.com/grpc-ecosystem/grpc-gateway/v2 v2.25.1 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
-	github.com/klauspost/compress v1.17.7 // indirect
+	github.com/klauspost/compress v1.17.11 // indirect
 	github.com/labstack/gommon v0.4.2 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
-	github.com/pierrec/lz4/v4 v4.1.21 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/pierrec/lz4/v4 v4.1.22 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
-	github.com/prometheus/client_model v0.6.1 // indirect
+	github.com/prometheus/common v0.61.0 // indirect
-	github.com/prometheus/common v0.52.2 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
-	github.com/prometheus/procfs v0.13.0 // indirect
+	github.com/samber/lo v1.47.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
 	github.com/valyala/fasttemplate v1.2.2 // indirect
-	go.opentelemetry.io/otel/metric v1.24.0 // indirect
+	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
-	go.opentelemetry.io/proto/otlp v1.1.0 // indirect
+	go.opentelemetry.io/contrib/bridges/prometheus v0.58.0 // indirect
-	golang.org/x/crypto v0.22.0 // indirect
+	go.opentelemetry.io/otel/exporters/prometheus v0.55.0 // indirect
-	golang.org/x/net v0.24.0 // indirect
+	go.opentelemetry.io/otel/exporters/stdout/stdoutlog v0.9.0 // indirect
-	golang.org/x/sys v0.19.0 // indirect
+	go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v1.33.0 // indirect
-	golang.org/x/text v0.14.0 // indirect
+	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.33.0 // indirect
-	google.golang.org/genproto/googleapis/api v0.0.0-20240401170217-c3f982113cda // indirect
+	go.opentelemetry.io/proto/otlp v1.4.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20240401170217-c3f982113cda // indirect
+	golang.org/x/crypto v0.31.0 // indirect
-	google.golang.org/grpc v1.63.0 // indirect
+	golang.org/x/sys v0.28.0 // indirect
-	google.golang.org/protobuf v1.33.0 // indirect
+	golang.org/x/text v0.21.0 // indirect
+	golang.org/x/time v0.8.0 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20241223144023-3abc09e42ca8 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20241223144023-3abc09e42ca8 // indirect
+	google.golang.org/protobuf v1.36.1 // indirect
 )

go.sum

@@ -1,39 +1,49 @@
+filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
+filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
 github.com/abh/certman v0.4.0 h1:XHoDtb0YyRQPclaHMrBDlKTVZpNjTK6vhB0S3Bd/Sbs=
 github.com/abh/certman v0.4.0/go.mod h1:x8QhpKVZifmV1Hdiwdg9gLo2GMPAxezz1s3zrVnPs+I=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
-github.com/cenkalti/backoff/v4 v4.2.1 h1:y4OZtCnogmCPw98Zjyt5a6+QwPLGkiQsYW5oUqylYbM=
-github.com/cenkalti/backoff/v4 v4.2.1/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
 github.com/cenkalti/backoff/v4 v4.3.0 h1:MyRJ/UdXutAwSAT+s3wNd7MfTIcy71VQueUuFK343L8=
 github.com/cenkalti/backoff/v4 v4.3.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE=
-github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
-github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
-github.com/cpuguy83/go-md2man/v2 v2.0.3/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
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@@ -145,10 +189,8 @@ golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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@@ -161,28 +203,26 @@ golang.org/x/text v0.3.8/go.mod h1:E6s5w1FMmriuDzIBO73fBruAKo1PCIq6d2Q6DHfQ8WQ=
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+google.golang.org/genproto/googleapis/rpc v0.0.0-20241223144023-3abc09e42ca8 h1:TqExAhdPaB60Ux47Cn0oLV07rGnxZzIsaRhQaqS666A=
-google.golang.org/genproto/googleapis/api v0.0.0-20240401170217-c3f982113cda/go.mod h1:AHcE/gZH76Bk/ROZhQphlRoWo5xKDEtz3eVEO1LfA8c=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20241223144023-3abc09e42ca8/go.mod h1:lcTa1sDdWEIHMWlITnIczmw5w60CF9ffkb8Z+DVmmjA=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20240314234333-6e1732d8331c h1:lfpJ/2rWPa/kJgxyyXM8PrNnfCzcmxJ265mADgwmvLI=
+google.golang.org/grpc v1.69.2 h1:U3S9QEtbXC0bYNvRtcoklF3xGtLViumSYxWykJS+7AU=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20240314234333-6e1732d8331c/go.mod h1:WtryC6hu0hhx87FDGxWCDptyssuo68sk10vYjF+T9fY=
+google.golang.org/grpc v1.69.2/go.mod h1:vyjdE6jLBI76dgpDojsFGNaHlxdjXN9ghpnd2o7JGZ4=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20240401170217-c3f982113cda h1:LI5DOvAxUPMv/50agcLLoo+AdWc1irS9Rzz4vPuD1V4=
+google.golang.org/protobuf v1.36.1 h1:yBPeRvTftaleIgM3PZ/WBIZ7XM/eEYAaEyCwvyjq/gk=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20240401170217-c3f982113cda/go.mod h1:WtryC6hu0hhx87FDGxWCDptyssuo68sk10vYjF+T9fY=
+google.golang.org/protobuf v1.36.1/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
-google.golang.org/grpc v1.62.1 h1:B4n+nfKzOICUXMgyrNd19h/I9oH0L1pizfk1d4zSgTk=
-google.golang.org/grpc v1.62.1/go.mod h1:IWTG0VlJLCh1SkC58F7np9ka9mx/WNkjl4PGJaiq+QE=
-google.golang.org/grpc v1.63.0 h1:WjKe+dnvABXyPJMD7KDNLxtoGk5tgk+YFWN6cBWjZE8=
-google.golang.org/grpc v1.63.0/go.mod h1:WAX/8DgncnokcFUldAxq7GeB5DXHDbMF+lLvDomNkRA=
-google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
-google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

health/health_server.go

@@ -1,7 +1,71 @@
+// Package health provides a standalone HTTP server for health checks.
+//
+// This package implements a flexible health check server that supports
+// different handlers for Kubernetes probe types (liveness, readiness, startup).
+// It provides structured logging, graceful shutdown, and standard HTTP endpoints
+// for monitoring and load balancing.
+//
+// # Kubernetes Probe Types
+//
+// Liveness Probe: Detects when a container is "dead" and needs restarting.
+// Should be a lightweight check that verifies the process is still running
+// and not in an unrecoverable state.
+//
+// Readiness Probe: Determines when a container is ready to accept traffic.
+// Controls which Pods are used as backends for Services. Should verify
+// the application can handle requests properly.
+//
+// Startup Probe: Verifies when a container application has successfully started.
+// Delays liveness and readiness probes until startup succeeds. Useful for
+// slow-starting applications.
+//
+// # Usage Examples
+//
+// Basic usage with a single handler for all probes:
+//
+//	srv := health.NewServer(myHealthHandler)
+//	srv.Listen(ctx, 9091)
+//
+// Advanced usage with separate handlers for each probe type:
+//
+//	srv := health.NewServer(nil,
+//		health.WithLivenessHandler(func(w http.ResponseWriter, r *http.Request) {
+//			// Simple alive check
+//			w.WriteHeader(http.StatusOK)
+//		}),
+//		health.WithReadinessHandler(func(w http.ResponseWriter, r *http.Request) {
+//			// Check if ready to serve traffic
+//			if err := checkDatabase(); err != nil {
+//				w.WriteHeader(http.StatusServiceUnavailable)
+//				return
+//			}
+//			w.WriteHeader(http.StatusOK)
+//		}),
+//		health.WithStartupHandler(func(w http.ResponseWriter, r *http.Request) {
+//			// Check if startup is complete
+//			if !applicationReady() {
+//				w.WriteHeader(http.StatusServiceUnavailable)
+//				return
+//			}
+//			w.WriteHeader(http.StatusOK)
+//		}),
+//		health.WithServiceName("my-service"),
+//	)
+//	srv.Listen(ctx, 9091)
+//
+// # Standard Endpoints
+//
+// The server exposes these endpoints:
+//   - /healthz - liveness probe (or general health if no specific handler)
+//   - /readyz - readiness probe (or general health if no specific handler)
+//   - /startupz - startup probe (or general health if no specific handler)
+//   - /__health - general health endpoint (backward compatibility)
+//   - / - general health endpoint (root path)
 package health
 
 import (
 	"context"
+	"encoding/json"
 	"log/slog"
 	"net/http"
 	"strconv"
@@ -11,32 +75,108 @@ import (
 	"golang.org/x/sync/errgroup"
 )
 
+// Server is a standalone HTTP server dedicated to health checks.
+// It runs separately from the main application server to ensure health
+// checks remain available even if the main server is experiencing issues.
+//
+// The server supports separate handlers for different Kubernetes probe types
+// (liveness, readiness, startup) and includes built-in timeouts, graceful
+// shutdown, and structured logging.
 type Server struct {
 	log              *slog.Logger
-	healthFn http.HandlerFunc
+	livenessHandler  http.HandlerFunc
+	readinessHandler http.HandlerFunc
+	startupHandler   http.HandlerFunc
+	generalHandler   http.HandlerFunc // fallback for /__health and / paths
+	serviceName      string
 }
 
-func NewServer(healthFn http.HandlerFunc) *Server {
+// Option represents a configuration option for the health server.
+type Option func(*Server)
+
+// WithLivenessHandler sets a specific handler for the /healthz endpoint.
+// Liveness probes determine if a container should be restarted.
+func WithLivenessHandler(handler http.HandlerFunc) Option {
+	return func(s *Server) {
+		s.livenessHandler = handler
+	}
+}
+
+// WithReadinessHandler sets a specific handler for the /readyz endpoint.
+// Readiness probes determine if a container can receive traffic.
+func WithReadinessHandler(handler http.HandlerFunc) Option {
+	return func(s *Server) {
+		s.readinessHandler = handler
+	}
+}
+
+// WithStartupHandler sets a specific handler for the /startupz endpoint.
+// Startup probes determine if a container has finished initializing.
+func WithStartupHandler(handler http.HandlerFunc) Option {
+	return func(s *Server) {
+		s.startupHandler = handler
+	}
+}
+
+// WithServiceName sets the service name for JSON responses and logging.
+func WithServiceName(serviceName string) Option {
+	return func(s *Server) {
+		s.serviceName = serviceName
+	}
+}
+
+
+// NewServer creates a new health check server with optional probe-specific handlers.
+//
+// If healthFn is provided, it will be used as a fallback for any probe endpoints
+// that don't have specific handlers configured. If healthFn is nil, a default
+// handler that returns HTTP 200 "ok" is used as the fallback.
+//
+// Use the With* option functions to configure specific handlers for different
+// probe types (liveness, readiness, startup).
+func NewServer(healthFn http.HandlerFunc, opts ...Option) *Server {
 	if healthFn == nil {
 		healthFn = basicHealth
 	}
 	srv := &Server{
 		log:            logger.Setup(),
-		healthFn: healthFn,
+		generalHandler: healthFn,
 	}
+
+	for _, opt := range opts {
+		opt(srv)
+	}
+
 	return srv
 }
 
+// SetLogger replaces the default logger with a custom one.
 func (srv *Server) SetLogger(log *slog.Logger) {
 	srv.log = log
 }
 
+// Listen starts the health server on the specified port and blocks until ctx is cancelled.
+// The server exposes health check endpoints with graceful shutdown support.
+//
+// Standard endpoints exposed:
+//   - /healthz - liveness probe (uses livenessHandler or falls back to generalHandler)
+//   - /readyz - readiness probe (uses readinessHandler or falls back to generalHandler)
+//   - /startupz - startup probe (uses startupHandler or falls back to generalHandler)
+//   - /__health - general health endpoint (uses generalHandler)
+//   - / - root health endpoint (uses generalHandler)
 func (srv *Server) Listen(ctx context.Context, port int) error {
-	srv.log.Info("Starting health listener", "port", port)
+	srv.log.Info("starting health listener", "port", port)
 
 	serveMux := http.NewServeMux()
 
-	serveMux.HandleFunc("/__health", srv.healthFn)
+	// Register probe-specific handlers
+	serveMux.HandleFunc("/healthz", srv.createProbeHandler("liveness"))
+	serveMux.HandleFunc("/readyz", srv.createProbeHandler("readiness"))
+	serveMux.HandleFunc("/startupz", srv.createProbeHandler("startup"))
+
+	// Register general health endpoints for backward compatibility
+	serveMux.HandleFunc("/__health", srv.createGeneralHandler())
+	serveMux.HandleFunc("/", srv.createGeneralHandler())
 
 	hsrv := &http.Server{
 		Addr:         ":" + strconv.Itoa(port),
@@ -59,11 +199,10 @@ func (srv *Server) Listen(ctx context.Context, port int) error {
 
 	<-ctx.Done()
 
-	ctx, cancel := context.WithTimeout(ctx, 2*time.Second)
-	defer cancel()
-
 	g.Go(func() error {
-		if err := hsrv.Shutdown(ctx); err != nil {
+		shCtx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+		defer cancel()
+		if err := hsrv.Shutdown(shCtx); err != nil {
 			srv.log.Error("health check server shutdown failed", "err", err)
 			return err
 		}
@@ -73,8 +212,122 @@ func (srv *Server) Listen(ctx context.Context, port int) error {
 	return g.Wait()
 }
 
-// HealthCheckListener runs simple http server on the specified port for
+// createProbeHandler creates a handler for a specific probe type that provides
-// health check probes
+// appropriate JSON responses and falls back to the general handler if no specific
+// handler is configured.
+func (srv *Server) createProbeHandler(probeType string) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		var handler http.HandlerFunc
+
+		// Select the appropriate handler
+		switch probeType {
+		case "liveness":
+			handler = srv.livenessHandler
+		case "readiness":
+			handler = srv.readinessHandler
+		case "startup":
+			handler = srv.startupHandler
+		}
+
+		// Fall back to general handler if no specific handler is configured
+		if handler == nil {
+			handler = srv.generalHandler
+		}
+
+		// Create a response recorder to capture the handler's status code
+		recorder := &statusRecorder{ResponseWriter: w, statusCode: 200}
+		handler(recorder, r)
+
+		// If the handler already wrote a response, we're done
+		if recorder.written {
+			return
+		}
+
+		// Otherwise, provide a standard JSON response based on the status code
+		w.Header().Set("Content-Type", "application/json")
+
+		if recorder.statusCode >= 400 {
+			// Handler indicated unhealthy
+			switch probeType {
+			case "liveness":
+				json.NewEncoder(w).Encode(map[string]string{"status": "unhealthy"})
+			case "readiness":
+				json.NewEncoder(w).Encode(map[string]bool{"ready": false})
+			case "startup":
+				json.NewEncoder(w).Encode(map[string]bool{"started": false})
+			}
+		} else {
+			// Handler indicated healthy
+			switch probeType {
+			case "liveness":
+				json.NewEncoder(w).Encode(map[string]string{"status": "alive"})
+			case "readiness":
+				json.NewEncoder(w).Encode(map[string]bool{"ready": true})
+			case "startup":
+				json.NewEncoder(w).Encode(map[string]bool{"started": true})
+			}
+		}
+	}
+}
+
+// createGeneralHandler creates a handler for general health endpoints that provides
+// comprehensive health information.
+func (srv *Server) createGeneralHandler() http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		// Create a response recorder to capture the handler's status code
+		// Use a buffer to prevent the handler from writing to the actual response
+		recorder := &statusRecorder{ResponseWriter: &discardWriter{}, statusCode: 200}
+		srv.generalHandler(recorder, r)
+
+		// Always provide a comprehensive JSON response for general endpoints
+		w.Header().Set("Content-Type", "application/json")
+		w.WriteHeader(recorder.statusCode)
+
+		response := map[string]interface{}{
+			"status": map[bool]string{true: "healthy", false: "unhealthy"}[recorder.statusCode < 400],
+		}
+
+		if srv.serviceName != "" {
+			response["service"] = srv.serviceName
+		}
+
+		json.NewEncoder(w).Encode(response)
+	}
+}
+
+// statusRecorder captures the response status code from handlers while allowing
+// them to write their own response content if needed.
+type statusRecorder struct {
+	http.ResponseWriter
+	statusCode int
+	written    bool
+}
+
+func (r *statusRecorder) WriteHeader(code int) {
+	r.statusCode = code
+	r.ResponseWriter.WriteHeader(code)
+}
+
+func (r *statusRecorder) Write(data []byte) (int, error) {
+	r.written = true
+	return r.ResponseWriter.Write(data)
+}
+
+// discardWriter implements http.ResponseWriter but discards all writes.
+// Used to capture status codes without writing response content.
+type discardWriter struct{}
+
+func (d *discardWriter) Header() http.Header {
+	return make(http.Header)
+}
+
+func (d *discardWriter) Write([]byte) (int, error) {
+	return 0, nil
+}
+
+func (d *discardWriter) WriteHeader(int) {}
+
+// HealthCheckListener runs a simple HTTP server on the specified port for health check probes.
 func HealthCheckListener(ctx context.Context, port int, log *slog.Logger) error {
 	srv := NewServer(nil)
 	srv.SetLogger(log)

health/health_test.go

@@ -1,14 +1,14 @@
 package health
 
 import (
+	"fmt"
 	"io"
 	"net/http"
 	"net/http/httptest"
 	"testing"
 )
 
-func TestHealthHandler(t *testing.T) {
+func TestBasicHealthHandler(t *testing.T) {
-
 	req := httptest.NewRequest(http.MethodGet, "/__health", nil)
 	w := httptest.NewRecorder()
 
@@ -25,3 +25,129 @@ func TestHealthHandler(t *testing.T) {
 		t.Errorf("expected ok got %q", string(data))
 	}
 }
+
+func TestProbeHandlers(t *testing.T) {
+	// Test with separate handlers for each probe type
+	srv := NewServer(nil,
+		WithLivenessHandler(func(w http.ResponseWriter, r *http.Request) {
+			w.WriteHeader(http.StatusOK)
+		}),
+		WithReadinessHandler(func(w http.ResponseWriter, r *http.Request) {
+			w.WriteHeader(http.StatusOK)
+		}),
+		WithStartupHandler(func(w http.ResponseWriter, r *http.Request) {
+			w.WriteHeader(http.StatusOK)
+		}),
+		WithServiceName("test-service"),
+	)
+
+	tests := []struct {
+		handler        http.HandlerFunc
+		expectedStatus int
+		expectedBody   string
+	}{
+		{srv.createProbeHandler("liveness"), 200, `{"status":"alive"}`},
+		{srv.createProbeHandler("readiness"), 200, `{"ready":true}`},
+		{srv.createProbeHandler("startup"), 200, `{"started":true}`},
+		{srv.createGeneralHandler(), 200, `{"service":"test-service","status":"healthy"}`},
+	}
+
+	for i, tt := range tests {
+		t.Run(fmt.Sprintf("test_%d", i), func(t *testing.T) {
+			req := httptest.NewRequest(http.MethodGet, "/", nil)
+			w := httptest.NewRecorder()
+
+			tt.handler(w, req)
+
+			if w.Code != tt.expectedStatus {
+				t.Errorf("expected status %d, got %d", tt.expectedStatus, w.Code)
+			}
+
+			body := w.Body.String()
+			if body != tt.expectedBody+"\n" { // json.Encoder adds newline
+				t.Errorf("expected body %q, got %q", tt.expectedBody, body)
+			}
+		})
+	}
+}
+
+func TestProbeHandlerFallback(t *testing.T) {
+	// Test fallback to general handler when no specific handler is configured
+	generalHandler := func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+	}
+
+	srv := NewServer(generalHandler, WithServiceName("test-service"))
+
+	tests := []struct {
+		handler        http.HandlerFunc
+		expectedStatus int
+		expectedBody   string
+	}{
+		{srv.createProbeHandler("liveness"), 200, `{"status":"alive"}`},
+		{srv.createProbeHandler("readiness"), 200, `{"ready":true}`},
+		{srv.createProbeHandler("startup"), 200, `{"started":true}`},
+	}
+
+	for i, tt := range tests {
+		t.Run(fmt.Sprintf("fallback_%d", i), func(t *testing.T) {
+			req := httptest.NewRequest(http.MethodGet, "/", nil)
+			w := httptest.NewRecorder()
+
+			tt.handler(w, req)
+
+			if w.Code != tt.expectedStatus {
+				t.Errorf("expected status %d, got %d", tt.expectedStatus, w.Code)
+			}
+
+			body := w.Body.String()
+			if body != tt.expectedBody+"\n" { // json.Encoder adds newline
+				t.Errorf("expected body %q, got %q", tt.expectedBody, body)
+			}
+		})
+	}
+}
+
+func TestUnhealthyProbeHandlers(t *testing.T) {
+	// Test with handlers that return unhealthy status
+	srv := NewServer(nil,
+		WithLivenessHandler(func(w http.ResponseWriter, r *http.Request) {
+			w.WriteHeader(http.StatusServiceUnavailable)
+		}),
+		WithReadinessHandler(func(w http.ResponseWriter, r *http.Request) {
+			w.WriteHeader(http.StatusServiceUnavailable)
+		}),
+		WithStartupHandler(func(w http.ResponseWriter, r *http.Request) {
+			w.WriteHeader(http.StatusServiceUnavailable)
+		}),
+		WithServiceName("test-service"),
+	)
+
+	tests := []struct {
+		handler        http.HandlerFunc
+		expectedStatus int
+		expectedBody   string
+	}{
+		{srv.createProbeHandler("liveness"), 503, `{"status":"unhealthy"}`},
+		{srv.createProbeHandler("readiness"), 503, `{"ready":false}`},
+		{srv.createProbeHandler("startup"), 503, `{"started":false}`},
+	}
+
+	for i, tt := range tests {
+		t.Run(fmt.Sprintf("unhealthy_%d", i), func(t *testing.T) {
+			req := httptest.NewRequest(http.MethodGet, "/", nil)
+			w := httptest.NewRecorder()
+
+			tt.handler(w, req)
+
+			if w.Code != tt.expectedStatus {
+				t.Errorf("expected status %d, got %d", tt.expectedStatus, w.Code)
+			}
+
+			body := w.Body.String()
+			if body != tt.expectedBody+"\n" { // json.Encoder adds newline
+				t.Errorf("expected body %q, got %q", tt.expectedBody, body)
+			}
+		})
+	}
+}

internal/tracerconfig/config.go

@@ -0,0 +1,378 @@
+// Package tracerconfig provides a bridge to eliminate circular dependencies between
+// the logger and tracing packages. It stores tracer configuration and provides
+// factory functions that can be used by the logger package without importing tracing.
+package tracerconfig
+
+import (
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"errors"
+	"fmt"
+	"net/url"
+	"os"
+	"strings"
+	"sync"
+	"time"
+
+	"go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploggrpc"
+	"go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc"
+	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
+	sdklog "go.opentelemetry.io/otel/sdk/log"
+	sdkmetric "go.opentelemetry.io/otel/sdk/metric"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	"google.golang.org/grpc/credentials"
+)
+
+const (
+	otelExporterOTLPProtoEnvKey        = "OTEL_EXPORTER_OTLP_PROTOCOL"
+	otelExporterOTLPTracesProtoEnvKey  = "OTEL_EXPORTER_OTLP_TRACES_PROTOCOL"
+	otelExporterOTLPLogsProtoEnvKey    = "OTEL_EXPORTER_OTLP_LOGS_PROTOCOL"
+	otelExporterOTLPMetricsProtoEnvKey = "OTEL_EXPORTER_OTLP_METRICS_PROTOCOL"
+)
+
+var errInvalidOTLPProtocol = errors.New("invalid OTLP protocol - should be one of ['grpc', 'http/protobuf']")
+
+// newInvalidProtocolError creates a specific error message for invalid protocols
+func newInvalidProtocolError(protocol, signalType string) error {
+	return fmt.Errorf("invalid OTLP protocol '%s' for %s - should be one of ['grpc', 'http/protobuf', 'http/json']", protocol, signalType)
+}
+
+// Validate checks the configuration for common errors and inconsistencies
+func (c *Config) Validate() error {
+	var errs []error
+
+	// Check that both Endpoint and EndpointURL are not specified
+	if c.Endpoint != "" && c.EndpointURL != "" {
+		errs = append(errs, errors.New("cannot specify both Endpoint and EndpointURL - use one or the other"))
+	}
+
+	// Validate EndpointURL format if specified
+	if c.EndpointURL != "" {
+		if _, err := url.Parse(c.EndpointURL); err != nil {
+			errs = append(errs, fmt.Errorf("invalid EndpointURL format: %w", err))
+		}
+	}
+
+	// Validate Endpoint format if specified
+	if c.Endpoint != "" {
+		// Basic validation - should not contain protocol scheme
+		if strings.Contains(c.Endpoint, "://") {
+			errs = append(errs, errors.New("Endpoint should not include protocol scheme (use EndpointURL for full URLs)"))
+		}
+		// Should not be empty after trimming whitespace
+		if strings.TrimSpace(c.Endpoint) == "" {
+			errs = append(errs, errors.New("Endpoint cannot be empty or whitespace"))
+		}
+	}
+
+	// Validate TLS configuration consistency
+	if c.CertificateProvider != nil && c.RootCAs == nil {
+		// This is just a warning - client cert without custom CAs is valid
+		// but might indicate a configuration issue
+	}
+
+	// Validate service name if specified
+	if c.ServiceName != "" && strings.TrimSpace(c.ServiceName) == "" {
+		errs = append(errs, errors.New("ServiceName cannot be empty or whitespace"))
+	}
+
+	// Combine all errors
+	if len(errs) > 0 {
+		var errMsgs []string
+		for _, err := range errs {
+			errMsgs = append(errMsgs, err.Error())
+		}
+		return fmt.Errorf("configuration validation failed: %s", strings.Join(errMsgs, "; "))
+	}
+
+	return nil
+}
+
+// ValidateAndStore validates the configuration before storing it
+func ValidateAndStore(ctx context.Context, cfg *Config, logFactory LogExporterFactory, metricFactory MetricExporterFactory, traceFactory TraceExporterFactory) error {
+	if cfg != nil {
+		if err := cfg.Validate(); err != nil {
+			return err
+		}
+	}
+	Store(ctx, cfg, logFactory, metricFactory, traceFactory)
+	return nil
+}
+
+// GetClientCertificate defines a function type for providing client certificates for mutual TLS.
+// This is used when exporting telemetry data to secured OTLP endpoints that require
+// client certificate authentication.
+type GetClientCertificate func(*tls.CertificateRequestInfo) (*tls.Certificate, error)
+
+// Config provides configuration options for OpenTelemetry tracing setup.
+// It supplements standard OpenTelemetry environment variables with additional
+// NTP Pool-specific configuration including TLS settings for secure OTLP export.
+type Config struct {
+	ServiceName         string               // Service name for resource identification (overrides OTEL_SERVICE_NAME)
+	Environment         string               // Deployment environment (development, staging, production)
+	Endpoint            string               // OTLP endpoint hostname/port (e.g., "otlp.example.com:4317")
+	EndpointURL         string               // Complete OTLP endpoint URL (e.g., "https://otlp.example.com:4317/v1/traces")
+	CertificateProvider GetClientCertificate // Client certificate provider for mutual TLS
+	RootCAs             *x509.CertPool       // CA certificate pool for server verification
+}
+
+// LogExporterFactory creates an OTLP log exporter using the provided configuration.
+// This allows the logger package to create exporters without importing the tracing package.
+type LogExporterFactory func(context.Context, *Config) (sdklog.Exporter, error)
+
+// MetricExporterFactory creates an OTLP metric exporter using the provided configuration.
+// This allows the metrics package to create exporters without importing the tracing package.
+type MetricExporterFactory func(context.Context, *Config) (sdkmetric.Exporter, error)
+
+// TraceExporterFactory creates an OTLP trace exporter using the provided configuration.
+// This allows for consistent trace exporter creation across packages.
+type TraceExporterFactory func(context.Context, *Config) (sdktrace.SpanExporter, error)
+
+// Global state for sharing configuration between packages
+var (
+	globalConfig          *Config
+	globalContext         context.Context
+	logExporterFactory    LogExporterFactory
+	metricExporterFactory MetricExporterFactory
+	traceExporterFactory  TraceExporterFactory
+	configMu              sync.RWMutex
+)
+
+// Store saves the tracer configuration and exporter factories for use by other packages.
+// This should be called by the tracing package during initialization.
+func Store(ctx context.Context, cfg *Config, logFactory LogExporterFactory, metricFactory MetricExporterFactory, traceFactory TraceExporterFactory) {
+	configMu.Lock()
+	defer configMu.Unlock()
+	globalConfig = cfg
+	globalContext = ctx
+	logExporterFactory = logFactory
+	metricExporterFactory = metricFactory
+	traceExporterFactory = traceFactory
+}
+
+// GetLogExporter returns the stored configuration and log exporter factory.
+// Returns nil values if no configuration has been stored yet.
+func GetLogExporter() (*Config, context.Context, LogExporterFactory) {
+	configMu.RLock()
+	defer configMu.RUnlock()
+	return globalConfig, globalContext, logExporterFactory
+}
+
+// GetMetricExporter returns the stored configuration and metric exporter factory.
+// Returns nil values if no configuration has been stored yet.
+func GetMetricExporter() (*Config, context.Context, MetricExporterFactory) {
+	configMu.RLock()
+	defer configMu.RUnlock()
+	return globalConfig, globalContext, metricExporterFactory
+}
+
+// GetTraceExporter returns the stored configuration and trace exporter factory.
+// Returns nil values if no configuration has been stored yet.
+func GetTraceExporter() (*Config, context.Context, TraceExporterFactory) {
+	configMu.RLock()
+	defer configMu.RUnlock()
+	return globalConfig, globalContext, traceExporterFactory
+}
+
+// Get returns the stored tracer configuration, context, and log exporter factory.
+// This maintains backward compatibility for the logger package.
+// Returns nil values if no configuration has been stored yet.
+func Get() (*Config, context.Context, LogExporterFactory) {
+	return GetLogExporter()
+}
+
+// IsConfigured returns true if tracer configuration has been stored.
+func IsConfigured() bool {
+	configMu.RLock()
+	defer configMu.RUnlock()
+	return globalConfig != nil && globalContext != nil
+}
+
+// Clear removes the stored configuration. This is primarily useful for testing.
+func Clear() {
+	configMu.Lock()
+	defer configMu.Unlock()
+	globalConfig = nil
+	globalContext = nil
+	logExporterFactory = nil
+	metricExporterFactory = nil
+	traceExporterFactory = nil
+}
+
+// getTLSConfig creates a TLS configuration from the provided Config.
+func getTLSConfig(cfg *Config) *tls.Config {
+	if cfg.CertificateProvider == nil {
+		return nil
+	}
+	return &tls.Config{
+		GetClientCertificate: cfg.CertificateProvider,
+		RootCAs:              cfg.RootCAs,
+	}
+}
+
+// getProtocol determines the OTLP protocol to use for the given signal type.
+// It follows OpenTelemetry environment variable precedence.
+func getProtocol(signalSpecificEnv string) string {
+	proto := os.Getenv(signalSpecificEnv)
+	if proto == "" {
+		proto = os.Getenv(otelExporterOTLPProtoEnvKey)
+	}
+	// Fallback to default, http/protobuf.
+	if proto == "" {
+		proto = "http/protobuf"
+	}
+	return proto
+}
+
+// CreateOTLPLogExporter creates an OTLP log exporter using the provided configuration.
+func CreateOTLPLogExporter(ctx context.Context, cfg *Config) (sdklog.Exporter, error) {
+	tlsConfig := getTLSConfig(cfg)
+	proto := getProtocol(otelExporterOTLPLogsProtoEnvKey)
+
+	switch proto {
+	case "grpc":
+		opts := []otlploggrpc.Option{
+			otlploggrpc.WithCompressor("gzip"),
+		}
+		if tlsConfig != nil {
+			opts = append(opts, otlploggrpc.WithTLSCredentials(credentials.NewTLS(tlsConfig)))
+		}
+		if len(cfg.Endpoint) > 0 {
+			opts = append(opts, otlploggrpc.WithEndpoint(cfg.Endpoint))
+		}
+		if len(cfg.EndpointURL) > 0 {
+			opts = append(opts, otlploggrpc.WithEndpointURL(cfg.EndpointURL))
+		}
+
+		return otlploggrpc.New(ctx, opts...)
+	case "http/protobuf", "http/json":
+		opts := []otlploghttp.Option{
+			otlploghttp.WithCompression(otlploghttp.GzipCompression),
+		}
+		if tlsConfig != nil {
+			opts = append(opts, otlploghttp.WithTLSClientConfig(tlsConfig))
+		}
+		if len(cfg.Endpoint) > 0 {
+			opts = append(opts, otlploghttp.WithEndpoint(cfg.Endpoint))
+		}
+		if len(cfg.EndpointURL) > 0 {
+			opts = append(opts, otlploghttp.WithEndpointURL(cfg.EndpointURL))
+		}
+
+		opts = append(opts, otlploghttp.WithRetry(otlploghttp.RetryConfig{
+			Enabled:         true,
+			InitialInterval: 3 * time.Second,
+			MaxInterval:     60 * time.Second,
+			MaxElapsedTime:  5 * time.Minute,
+		}))
+
+		return otlploghttp.New(ctx, opts...)
+	default:
+		return nil, newInvalidProtocolError(proto, "logs")
+	}
+}
+
+// CreateOTLPMetricExporter creates an OTLP metric exporter using the provided configuration.
+func CreateOTLPMetricExporter(ctx context.Context, cfg *Config) (sdkmetric.Exporter, error) {
+	tlsConfig := getTLSConfig(cfg)
+	proto := getProtocol(otelExporterOTLPMetricsProtoEnvKey)
+
+	switch proto {
+	case "grpc":
+		opts := []otlpmetricgrpc.Option{
+			otlpmetricgrpc.WithCompressor("gzip"),
+		}
+		if tlsConfig != nil {
+			opts = append(opts, otlpmetricgrpc.WithTLSCredentials(credentials.NewTLS(tlsConfig)))
+		}
+		if len(cfg.Endpoint) > 0 {
+			opts = append(opts, otlpmetricgrpc.WithEndpoint(cfg.Endpoint))
+		}
+		if len(cfg.EndpointURL) > 0 {
+			opts = append(opts, otlpmetricgrpc.WithEndpointURL(cfg.EndpointURL))
+		}
+
+		return otlpmetricgrpc.New(ctx, opts...)
+	case "http/protobuf", "http/json":
+		opts := []otlpmetrichttp.Option{
+			otlpmetrichttp.WithCompression(otlpmetrichttp.GzipCompression),
+		}
+		if tlsConfig != nil {
+			opts = append(opts, otlpmetrichttp.WithTLSClientConfig(tlsConfig))
+		}
+		if len(cfg.Endpoint) > 0 {
+			opts = append(opts, otlpmetrichttp.WithEndpoint(cfg.Endpoint))
+		}
+		if len(cfg.EndpointURL) > 0 {
+			opts = append(opts, otlpmetrichttp.WithEndpointURL(cfg.EndpointURL))
+		}
+
+		opts = append(opts, otlpmetrichttp.WithRetry(otlpmetrichttp.RetryConfig{
+			Enabled:         true,
+			InitialInterval: 3 * time.Second,
+			MaxInterval:     60 * time.Second,
+			MaxElapsedTime:  5 * time.Minute,
+		}))
+
+		return otlpmetrichttp.New(ctx, opts...)
+	default:
+		return nil, newInvalidProtocolError(proto, "metrics")
+	}
+}
+
+// CreateOTLPTraceExporter creates an OTLP trace exporter using the provided configuration.
+func CreateOTLPTraceExporter(ctx context.Context, cfg *Config) (sdktrace.SpanExporter, error) {
+	tlsConfig := getTLSConfig(cfg)
+	proto := getProtocol(otelExporterOTLPTracesProtoEnvKey)
+
+	var client otlptrace.Client
+
+	switch proto {
+	case "grpc":
+		opts := []otlptracegrpc.Option{
+			otlptracegrpc.WithCompressor("gzip"),
+		}
+		if tlsConfig != nil {
+			opts = append(opts, otlptracegrpc.WithTLSCredentials(credentials.NewTLS(tlsConfig)))
+		}
+		if len(cfg.Endpoint) > 0 {
+			opts = append(opts, otlptracegrpc.WithEndpoint(cfg.Endpoint))
+		}
+		if len(cfg.EndpointURL) > 0 {
+			opts = append(opts, otlptracegrpc.WithEndpointURL(cfg.EndpointURL))
+		}
+
+		client = otlptracegrpc.NewClient(opts...)
+	case "http/protobuf", "http/json":
+		opts := []otlptracehttp.Option{
+			otlptracehttp.WithCompression(otlptracehttp.GzipCompression),
+		}
+		if tlsConfig != nil {
+			opts = append(opts, otlptracehttp.WithTLSClientConfig(tlsConfig))
+		}
+		if len(cfg.Endpoint) > 0 {
+			opts = append(opts, otlptracehttp.WithEndpoint(cfg.Endpoint))
+		}
+		if len(cfg.EndpointURL) > 0 {
+			opts = append(opts, otlptracehttp.WithEndpointURL(cfg.EndpointURL))
+		}
+
+		opts = append(opts, otlptracehttp.WithRetry(otlptracehttp.RetryConfig{
+			Enabled:         true,
+			InitialInterval: 3 * time.Second,
+			MaxInterval:     60 * time.Second,
+			MaxElapsedTime:  5 * time.Minute,
+		}))
+
+		client = otlptracehttp.NewClient(opts...)
+	default:
+		return nil, newInvalidProtocolError(proto, "traces")
+	}
+
+	return otlptrace.New(ctx, client)
+}

internal/tracerconfig/config_test.go

@@ -0,0 +1,474 @@
+package tracerconfig
+
+import (
+	"context"
+	"crypto/tls"
+	"crypto/x509"
+	"os"
+	"strings"
+	"sync"
+	"testing"
+	"time"
+
+	sdklog "go.opentelemetry.io/otel/sdk/log"
+	sdkmetric "go.opentelemetry.io/otel/sdk/metric"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+)
+
+func TestStore_And_Retrieve(t *testing.T) {
+	// Clear any existing configuration
+	Clear()
+
+	ctx := context.Background()
+	config := &Config{
+		ServiceName: "test-service",
+		Environment: "test",
+		Endpoint:    "localhost:4317",
+	}
+
+	// Create mock factories
+	logFactory := func(context.Context, *Config) (sdklog.Exporter, error) { return nil, nil }
+	metricFactory := func(context.Context, *Config) (sdkmetric.Exporter, error) { return nil, nil }
+	traceFactory := func(context.Context, *Config) (sdktrace.SpanExporter, error) { return nil, nil }
+
+	// Store configuration
+	Store(ctx, config, logFactory, metricFactory, traceFactory)
+
+	// Test IsConfigured
+	if !IsConfigured() {
+		t.Error("IsConfigured() should return true after Store()")
+	}
+
+	// Test GetLogExporter
+	cfg, ctx2, factory := GetLogExporter()
+	if cfg == nil || ctx2 == nil || factory == nil {
+		t.Error("GetLogExporter() should return non-nil values")
+	}
+	if cfg.ServiceName != "test-service" {
+		t.Errorf("Expected ServiceName 'test-service', got '%s'", cfg.ServiceName)
+	}
+
+	// Test GetMetricExporter
+	cfg, ctx3, metricFact := GetMetricExporter()
+	if cfg == nil || ctx3 == nil || metricFact == nil {
+		t.Error("GetMetricExporter() should return non-nil values")
+	}
+
+	// Test GetTraceExporter
+	cfg, ctx4, traceFact := GetTraceExporter()
+	if cfg == nil || ctx4 == nil || traceFact == nil {
+		t.Error("GetTraceExporter() should return non-nil values")
+	}
+
+	// Test backward compatibility Get()
+	cfg, ctx5, logFact := Get()
+	if cfg == nil || ctx5 == nil || logFact == nil {
+		t.Error("Get() should return non-nil values for backward compatibility")
+	}
+}
+
+func TestClear(t *testing.T) {
+	// Store some configuration first
+	ctx := context.Background()
+	config := &Config{ServiceName: "test"}
+	Store(ctx, config, nil, nil, nil)
+
+	if !IsConfigured() {
+		t.Error("Should be configured before Clear()")
+	}
+
+	// Clear configuration
+	Clear()
+
+	if IsConfigured() {
+		t.Error("Should not be configured after Clear()")
+	}
+
+	// All getters should return nil
+	cfg, ctx2, factory := GetLogExporter()
+	if cfg != nil || ctx2 != nil || factory != nil {
+		t.Error("GetLogExporter() should return nil values after Clear()")
+	}
+}
+
+func TestConcurrentAccess(t *testing.T) {
+	Clear()
+
+	ctx := context.Background()
+	config := &Config{ServiceName: "concurrent-test"}
+
+	var wg sync.WaitGroup
+	const numGoroutines = 10
+
+	// Test concurrent Store and Get operations
+	wg.Add(numGoroutines * 2)
+
+	// Concurrent Store operations
+	for i := 0; i < numGoroutines; i++ {
+		go func() {
+			defer wg.Done()
+			Store(ctx, config, nil, nil, nil)
+		}()
+	}
+
+	// Concurrent Get operations
+	for i := 0; i < numGoroutines; i++ {
+		go func() {
+			defer wg.Done()
+			IsConfigured()
+			GetLogExporter()
+			GetMetricExporter()
+			GetTraceExporter()
+		}()
+	}
+
+	wg.Wait()
+
+	// Should be configured after all operations
+	if !IsConfigured() {
+		t.Error("Should be configured after concurrent operations")
+	}
+}
+
+func TestGetTLSConfig(t *testing.T) {
+	tests := []struct {
+		name     string
+		config   *Config
+		expected bool // whether TLS config should be nil
+	}{
+		{
+			name:     "nil certificate provider",
+			config:   &Config{},
+			expected: true, // should be nil
+		},
+		{
+			name: "with certificate provider",
+			config: &Config{
+				CertificateProvider: func(*tls.CertificateRequestInfo) (*tls.Certificate, error) {
+					return &tls.Certificate{}, nil
+				},
+			},
+			expected: false, // should not be nil
+		},
+		{
+			name: "with certificate provider and RootCAs",
+			config: &Config{
+				CertificateProvider: func(*tls.CertificateRequestInfo) (*tls.Certificate, error) {
+					return &tls.Certificate{}, nil
+				},
+				RootCAs: x509.NewCertPool(),
+			},
+			expected: false, // should not be nil
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			tlsConfig := getTLSConfig(tt.config)
+			if tt.expected && tlsConfig != nil {
+				t.Errorf("Expected nil TLS config, got %v", tlsConfig)
+			}
+			if !tt.expected && tlsConfig == nil {
+				t.Error("Expected non-nil TLS config, got nil")
+			}
+			if !tt.expected && tlsConfig != nil {
+				if tlsConfig.GetClientCertificate == nil {
+					t.Error("Expected GetClientCertificate to be set")
+				}
+				if tt.config.RootCAs != nil && tlsConfig.RootCAs != tt.config.RootCAs {
+					t.Error("Expected RootCAs to be set correctly")
+				}
+			}
+		})
+	}
+}
+
+func TestGetProtocol(t *testing.T) {
+	// Save original env vars
+	originalGeneral := os.Getenv(otelExporterOTLPProtoEnvKey)
+	originalLogs := os.Getenv(otelExporterOTLPLogsProtoEnvKey)
+
+	defer func() {
+		// Restore original env vars
+		if originalGeneral != "" {
+			os.Setenv(otelExporterOTLPProtoEnvKey, originalGeneral)
+		} else {
+			os.Unsetenv(otelExporterOTLPProtoEnvKey)
+		}
+		if originalLogs != "" {
+			os.Setenv(otelExporterOTLPLogsProtoEnvKey, originalLogs)
+		} else {
+			os.Unsetenv(otelExporterOTLPLogsProtoEnvKey)
+		}
+	}()
+
+	tests := []struct {
+		name           string
+		signalSpecific string
+		generalProto   string
+		specificProto  string
+		expectedResult string
+	}{
+		{
+			name:           "no env vars set - default",
+			signalSpecific: otelExporterOTLPLogsProtoEnvKey,
+			expectedResult: "http/protobuf",
+		},
+		{
+			name:           "general env var set",
+			signalSpecific: otelExporterOTLPLogsProtoEnvKey,
+			generalProto:   "grpc",
+			expectedResult: "grpc",
+		},
+		{
+			name:           "specific env var overrides general",
+			signalSpecific: otelExporterOTLPLogsProtoEnvKey,
+			generalProto:   "grpc",
+			specificProto:  "http/protobuf",
+			expectedResult: "http/protobuf",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// Clear env vars
+			os.Unsetenv(otelExporterOTLPProtoEnvKey)
+			os.Unsetenv(otelExporterOTLPLogsProtoEnvKey)
+
+			// Set test env vars
+			if tt.generalProto != "" {
+				os.Setenv(otelExporterOTLPProtoEnvKey, tt.generalProto)
+			}
+			if tt.specificProto != "" {
+				os.Setenv(tt.signalSpecific, tt.specificProto)
+			}
+
+			result := getProtocol(tt.signalSpecific)
+			if result != tt.expectedResult {
+				t.Errorf("Expected protocol '%s', got '%s'", tt.expectedResult, result)
+			}
+		})
+	}
+}
+
+func TestCreateExporterErrors(t *testing.T) {
+	ctx := context.Background()
+	config := &Config{
+		ServiceName: "test-service",
+		Endpoint:    "invalid-endpoint",
+	}
+
+	// Test with invalid protocol for logs
+	os.Setenv(otelExporterOTLPLogsProtoEnvKey, "invalid-protocol")
+	defer os.Unsetenv(otelExporterOTLPLogsProtoEnvKey)
+
+	_, err := CreateOTLPLogExporter(ctx, config)
+	if err == nil {
+		t.Error("Expected error for invalid protocol")
+	}
+	// Check that it's a protocol error (the specific message will be different now)
+	if !strings.Contains(err.Error(), "invalid OTLP protocol") {
+		t.Errorf("Expected protocol error, got %v", err)
+	}
+
+	// Test with invalid protocol for metrics
+	os.Setenv(otelExporterOTLPMetricsProtoEnvKey, "invalid-protocol")
+	defer os.Unsetenv(otelExporterOTLPMetricsProtoEnvKey)
+
+	_, err = CreateOTLPMetricExporter(ctx, config)
+	if err == nil {
+		t.Error("Expected error for invalid protocol")
+	}
+	if !strings.Contains(err.Error(), "invalid OTLP protocol") {
+		t.Errorf("Expected protocol error, got %v", err)
+	}
+
+	// Test with invalid protocol for traces
+	os.Setenv(otelExporterOTLPTracesProtoEnvKey, "invalid-protocol")
+	defer os.Unsetenv(otelExporterOTLPTracesProtoEnvKey)
+
+	_, err = CreateOTLPTraceExporter(ctx, config)
+	if err == nil {
+		t.Error("Expected error for invalid protocol")
+	}
+	if !strings.Contains(err.Error(), "invalid OTLP protocol") {
+		t.Errorf("Expected protocol error, got %v", err)
+	}
+}
+
+func TestCreateExporterValidProtocols(t *testing.T) {
+	ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+	defer cancel()
+
+	config := &Config{
+		ServiceName: "test-service",
+		Endpoint:    "localhost:4317", // This will likely fail to connect, but should create exporter
+	}
+
+	protocols := []string{"grpc", "http/protobuf", "http/json"}
+
+	for _, proto := range protocols {
+		t.Run("logs_"+proto, func(t *testing.T) {
+			os.Setenv(otelExporterOTLPLogsProtoEnvKey, proto)
+			defer os.Unsetenv(otelExporterOTLPLogsProtoEnvKey)
+
+			exporter, err := CreateOTLPLogExporter(ctx, config)
+			if err != nil {
+				// Connection errors are expected since we're not running a real OTLP server
+				// but the exporter should be created successfully
+				t.Logf("Connection error expected: %v", err)
+			}
+			if exporter != nil {
+				exporter.Shutdown(ctx)
+			}
+		})
+
+		t.Run("metrics_"+proto, func(t *testing.T) {
+			os.Setenv(otelExporterOTLPMetricsProtoEnvKey, proto)
+			defer os.Unsetenv(otelExporterOTLPMetricsProtoEnvKey)
+
+			exporter, err := CreateOTLPMetricExporter(ctx, config)
+			if err != nil {
+				t.Logf("Connection error expected: %v", err)
+			}
+			if exporter != nil {
+				exporter.Shutdown(ctx)
+			}
+		})
+
+		t.Run("traces_"+proto, func(t *testing.T) {
+			os.Setenv(otelExporterOTLPTracesProtoEnvKey, proto)
+			defer os.Unsetenv(otelExporterOTLPTracesProtoEnvKey)
+
+			exporter, err := CreateOTLPTraceExporter(ctx, config)
+			if err != nil {
+				t.Logf("Connection error expected: %v", err)
+			}
+			if exporter != nil {
+				exporter.Shutdown(ctx)
+			}
+		})
+	}
+}
+
+func TestConfigValidation(t *testing.T) {
+	tests := []struct {
+		name      string
+		config    *Config
+		shouldErr bool
+	}{
+		{
+			name:      "valid empty config",
+			config:    &Config{},
+			shouldErr: false,
+		},
+		{
+			name: "valid config with endpoint",
+			config: &Config{
+				ServiceName: "test-service",
+				Endpoint:    "localhost:4317",
+			},
+			shouldErr: false,
+		},
+		{
+			name: "valid config with endpoint URL",
+			config: &Config{
+				ServiceName: "test-service",
+				EndpointURL: "https://otlp.example.com:4317/v1/traces",
+			},
+			shouldErr: false,
+		},
+		{
+			name: "invalid - both endpoint and endpoint URL",
+			config: &Config{
+				ServiceName: "test-service",
+				Endpoint:    "localhost:4317",
+				EndpointURL: "https://otlp.example.com:4317/v1/traces",
+			},
+			shouldErr: true,
+		},
+		{
+			name: "invalid - endpoint with protocol",
+			config: &Config{
+				ServiceName: "test-service",
+				Endpoint:    "https://localhost:4317",
+			},
+			shouldErr: true,
+		},
+		{
+			name: "invalid - empty endpoint",
+			config: &Config{
+				ServiceName: "test-service",
+				Endpoint:    "   ",
+			},
+			shouldErr: true,
+		},
+		{
+			name: "invalid - malformed endpoint URL",
+			config: &Config{
+				ServiceName: "test-service",
+				EndpointURL: "://invalid-url-missing-scheme",
+			},
+			shouldErr: true,
+		},
+		{
+			name: "invalid - empty service name",
+			config: &Config{
+				ServiceName: "   ",
+				Endpoint:    "localhost:4317",
+			},
+			shouldErr: true,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := tt.config.Validate()
+			if tt.shouldErr && err == nil {
+				t.Error("Expected validation error, got nil")
+			}
+			if !tt.shouldErr && err != nil {
+				t.Errorf("Expected no validation error, got: %v", err)
+			}
+		})
+	}
+}
+
+func TestValidateAndStore(t *testing.T) {
+	Clear()
+
+	ctx := context.Background()
+
+	// Test with valid config
+	validConfig := &Config{
+		ServiceName: "test-service",
+		Endpoint:    "localhost:4317",
+	}
+
+	err := ValidateAndStore(ctx, validConfig, nil, nil, nil)
+	if err != nil {
+		t.Errorf("ValidateAndStore with valid config should not error: %v", err)
+	}
+
+	if !IsConfigured() {
+		t.Error("Should be configured after ValidateAndStore")
+	}
+
+	Clear()
+
+	// Test with invalid config
+	invalidConfig := &Config{
+		ServiceName: "test-service",
+		Endpoint:    "localhost:4317",
+		EndpointURL: "https://example.com:4317", // both specified - invalid
+	}
+
+	err = ValidateAndStore(ctx, invalidConfig, nil, nil, nil)
+	if err == nil {
+		t.Error("ValidateAndStore with invalid config should return error")
+	}
+
+	if IsConfigured() {
+		t.Error("Should not be configured after failed ValidateAndStore")
+	}
+}

kafka/kafka.go

@@ -1,3 +1,32 @@
+// Package kafconn provides a Kafka client wrapper with TLS support for secure log streaming.
+//
+// This package handles Kafka connections with mutual TLS authentication for the NTP Pool
+// project's log streaming infrastructure. It provides factories for creating Kafka readers
+// and writers with automatic broker discovery, TLS configuration, and connection management.
+//
+// The package is designed specifically for the NTP Pool pipeline infrastructure and includes
+// hardcoded bootstrap servers and group configurations. It uses certman for automatic
+// certificate renewal and provides compression and batching optimizations.
+//
+// Key features:
+//   - Mutual TLS authentication with automatic certificate renewal
+//   - Broker discovery and connection pooling
+//   - Reader and writer factory methods with optimized configurations
+//   - LZ4 compression for efficient data transfer
+//   - Configurable batch sizes and load balancing
+//
+// Example usage:
+//
+//	tlsSetup := kafconn.TLSSetup{
+//		CA:   "/path/to/ca.pem",
+//		Cert: "/path/to/client.pem",
+//		Key:  "/path/to/client.key",
+//	}
+//	kafka, err := kafconn.NewKafka(ctx, tlsSetup)
+//	if err != nil {
+//		log.Fatal(err)
+//	}
+//	writer, err := kafka.NewWriter("logs")
 package kafconn
 
 import (
@@ -24,12 +53,17 @@ const (
 	// kafkaMinBatchSize = 1000
 )
 
+// TLSSetup contains file paths for TLS certificate configuration.
+// All fields are required for establishing secure Kafka connections.
 type TLSSetup struct {
-	CA   string
+	CA   string // Path to CA certificate file for server verification
-	Key  string
+	Key  string // Path to client private key file
-	Cert string
+	Cert string // Path to client certificate file
 }
 
+// Kafka represents a configured Kafka client with TLS support.
+// It manages connections, brokers, and provides factory methods for readers and writers.
+// The client handles broker discovery, connection pooling, and TLS configuration automatically.
 type Kafka struct {
 	tls TLSSetup
 
@@ -42,11 +76,9 @@ type Kafka struct {
 	l *log.Logger
 
 	// wr *kafka.Writer
-
 }
 
 func (k *Kafka) tlsConfig() (*tls.Config, error) {
-
 	cm, err := certman.New(k.tls.Cert, k.tls.Key)
 	if err != nil {
 		return nil, err
@@ -118,6 +150,19 @@ func (k *Kafka) kafkaTransport(ctx context.Context) (*kafka.Transport, error) {
 	return transport, nil
 }
 
+// NewKafka creates a new Kafka client with TLS configuration and establishes initial connections.
+// It performs broker discovery, validates TLS certificates, and prepares the client for creating
+// readers and writers.
+//
+// The function validates TLS configuration, establishes a connection to the bootstrap server,
+// discovers all available brokers, and configures transport layers for optimal performance.
+//
+// Parameters:
+//   - ctx: Context for connection establishment and timeouts
+//   - tls: TLS configuration with paths to CA, certificate, and key files
+//
+// Returns a configured Kafka client ready for creating readers and writers, or an error
+// if TLS setup fails, connection cannot be established, or broker discovery fails.
 func NewKafka(ctx context.Context, tls TLSSetup) (*Kafka, error) {
 	l := log.New(os.Stdout, "kafka: ", log.Ldate|log.Ltime|log.LUTC|log.Lmsgprefix|log.Lmicroseconds)
 
@@ -173,6 +218,12 @@ func NewKafka(ctx context.Context, tls TLSSetup) (*Kafka, error) {
 	return k, nil
 }
 
+// NewReader creates a new Kafka reader with the client's broker list and TLS configuration.
+// The provided config is enhanced with the discovered brokers and configured dialer.
+// The reader supports automatic offset management, consumer group coordination, and reconnection.
+//
+// The caller should configure the reader's Topic, GroupID, and other consumer-specific settings
+// in the provided config. The client automatically sets Brokers and Dialer fields.
 func (k *Kafka) NewReader(config kafka.ReaderConfig) *kafka.Reader {
 	config.Brokers = k.brokerAddrs()
 	config.Dialer = k.dialer
@@ -188,8 +239,17 @@ func (k *Kafka) brokerAddrs() []string {
 	return addrs
 }
 
+// NewWriter creates a new Kafka writer for the specified topic with optimized configuration.
+// The writer uses LZ4 compression, least-bytes load balancing, and batching for performance.
+//
+// Configuration includes:
+//   - Batch size: 2000 messages for efficient throughput
+//   - Compression: LZ4 for fast compression with good ratios
+//   - Balancer: LeastBytes for optimal partition distribution
+//   - Transport: TLS-configured transport with connection pooling
+//
+// The writer is ready for immediate use and handles connection management automatically.
 func (k *Kafka) NewWriter(topic string) (*kafka.Writer, error) {
-
 	// https://pkg.go.dev/github.com/segmentio/kafka-go#Writer
 	w := &kafka.Writer{
 		Addr:        kafka.TCP(k.brokerAddrs()...),
@@ -205,6 +265,12 @@ func (k *Kafka) NewWriter(topic string) (*kafka.Writer, error) {
 	return w, nil
 }
 
+// CheckPartitions verifies that the Kafka connection can read partition metadata.
+// This method is useful for health checks and connection validation.
+//
+// Returns an error if partition metadata cannot be retrieved, which typically
+// indicates connection problems, authentication failures, or broker unavailability.
+// Logs a warning if no partitions are available but does not return an error.
 func (k *Kafka) CheckPartitions() error {
 	partitions, err := k.conn.ReadPartitions()
 	if err != nil {

logger/buffering_exporter.go

@@ -0,0 +1,204 @@
+package logger
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"sync"
+	"time"
+
+	"go.ntppool.org/common/internal/tracerconfig"
+	otellog "go.opentelemetry.io/otel/sdk/log"
+)
+
+// bufferingExporter wraps an OTLP exporter and buffers logs until tracing is configured
+type bufferingExporter struct {
+	mu sync.RWMutex
+
+	// Buffered records while waiting for tracing config
+	buffer      [][]otellog.Record
+	bufferSize  int
+	maxBuffSize int
+
+	// Real exporter (created when tracing is configured)
+	exporter otellog.Exporter
+
+	// Thread-safe initialization state (managed only by checkReadiness)
+	initErr error
+
+	// Background checker
+	stopChecker chan struct{}
+	checkerDone chan struct{}
+}
+
+// newBufferingExporter creates a new exporter that buffers logs until tracing is configured
+func newBufferingExporter() *bufferingExporter {
+	e := &bufferingExporter{
+		maxBuffSize: 1000, // Max number of batches to buffer
+		stopChecker: make(chan struct{}),
+		checkerDone: make(chan struct{}),
+	}
+
+	// Start background readiness checker
+	go e.checkReadiness()
+
+	return e
+}
+
+// Export implements otellog.Exporter
+func (e *bufferingExporter) Export(ctx context.Context, records []otellog.Record) error {
+	// Check if exporter is ready (initialization handled by checkReadiness goroutine)
+	e.mu.RLock()
+	exporter := e.exporter
+	e.mu.RUnlock()
+
+	if exporter != nil {
+		return exporter.Export(ctx, records)
+	}
+
+	// Not ready yet, buffer the records
+	return e.bufferRecords(records)
+}
+
+// initialize attempts to create the real OTLP exporter using tracing config
+func (e *bufferingExporter) initialize() error {
+	cfg, ctx, factory := tracerconfig.Get()
+	if cfg == nil || ctx == nil || factory == nil {
+		return errors.New("tracer not configured yet")
+	}
+
+	// Add timeout for initialization
+	initCtx, cancel := context.WithTimeout(ctx, 10*time.Second)
+	defer cancel()
+
+	exporter, err := factory(initCtx, cfg)
+	if err != nil {
+		return fmt.Errorf("failed to create OTLP exporter: %w", err)
+	}
+
+	e.mu.Lock()
+	e.exporter = exporter
+	flushErr := e.flushBuffer(initCtx)
+	e.mu.Unlock()
+
+	if flushErr != nil {
+		// Log but don't fail initialization
+		Setup().Warn("buffer flush failed during initialization", "error", flushErr)
+	}
+
+	return nil
+}
+
+// bufferRecords adds records to the buffer for later processing
+func (e *bufferingExporter) bufferRecords(records []otellog.Record) error {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+
+	// Buffer the batch if we have space
+	if e.bufferSize < e.maxBuffSize {
+		// Clone records to avoid retention issues
+		cloned := make([]otellog.Record, len(records))
+		for i, r := range records {
+			cloned[i] = r.Clone()
+		}
+		e.buffer = append(e.buffer, cloned)
+		e.bufferSize++
+	}
+
+	// Always return success to BatchProcessor
+	return nil
+}
+
+// checkReadiness periodically attempts initialization until successful
+func (e *bufferingExporter) checkReadiness() {
+	defer close(e.checkerDone)
+
+	ticker := time.NewTicker(1 * time.Second)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ticker.C:
+			// Check if we already have a working exporter
+			e.mu.RLock()
+			hasExporter := e.exporter != nil
+			e.mu.RUnlock()
+
+			if hasExporter {
+				return // Exporter ready, checker no longer needed
+			}
+
+			// Try to initialize
+			err := e.initialize()
+			e.mu.Lock()
+			e.initErr = err
+			e.mu.Unlock()
+
+		case <-e.stopChecker:
+			return
+		}
+	}
+}
+
+// flushBuffer sends all buffered batches through the real exporter
+func (e *bufferingExporter) flushBuffer(ctx context.Context) error {
+	if len(e.buffer) == 0 {
+		return nil
+	}
+
+	flushCtx, cancel := context.WithTimeout(ctx, 30*time.Second)
+	defer cancel()
+
+	var lastErr error
+	for _, batch := range e.buffer {
+		if err := e.exporter.Export(flushCtx, batch); err != nil {
+			lastErr = err
+		}
+	}
+
+	// Clear buffer after flush attempt
+	e.buffer = nil
+	e.bufferSize = 0
+
+	return lastErr
+}
+
+// ForceFlush implements otellog.Exporter
+func (e *bufferingExporter) ForceFlush(ctx context.Context) error {
+	e.mu.RLock()
+	defer e.mu.RUnlock()
+
+	if e.exporter != nil {
+		return e.exporter.ForceFlush(ctx)
+	}
+	return nil
+}
+
+// Shutdown implements otellog.Exporter
+func (e *bufferingExporter) Shutdown(ctx context.Context) error {
+	// Stop the readiness checker from continuing
+	close(e.stopChecker)
+
+	// Wait for readiness checker goroutine to complete
+	<-e.checkerDone
+
+	// Give one final chance for TLS/tracing to become ready for buffer flushing
+	e.mu.RLock()
+	hasExporter := e.exporter != nil
+	e.mu.RUnlock()
+
+	if !hasExporter {
+		err := e.initialize()
+		e.mu.Lock()
+		e.initErr = err
+		e.mu.Unlock()
+	}
+
+	e.mu.Lock()
+	defer e.mu.Unlock()
+
+	if e.exporter != nil {
+		return e.exporter.Shutdown(ctx)
+	}
+	return nil
+}

logger/level_test.go

@@ -0,0 +1,235 @@
+package logger
+
+import (
+	"context"
+	"log/slog"
+	"os"
+	"testing"
+	"time"
+)
+
+func TestParseLevel(t *testing.T) {
+	tests := []struct {
+		name        string
+		input       string
+		expected    slog.Level
+		expectError bool
+	}{
+		{"empty string", "", slog.LevelInfo, false},
+		{"DEBUG upper", "DEBUG", slog.LevelDebug, false},
+		{"debug lower", "debug", slog.LevelDebug, false},
+		{"INFO upper", "INFO", slog.LevelInfo, false},
+		{"info lower", "info", slog.LevelInfo, false},
+		{"WARN upper", "WARN", slog.LevelWarn, false},
+		{"warn lower", "warn", slog.LevelWarn, false},
+		{"ERROR upper", "ERROR", slog.LevelError, false},
+		{"error lower", "error", slog.LevelError, false},
+		{"invalid level", "invalid", slog.LevelInfo, true},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			level, err := ParseLevel(tt.input)
+			if tt.expectError {
+				if err == nil {
+					t.Errorf("expected error for input %q, got nil", tt.input)
+				}
+			} else {
+				if err != nil {
+					t.Errorf("unexpected error for input %q: %v", tt.input, err)
+				}
+				if level != tt.expected {
+					t.Errorf("expected level %v for input %q, got %v", tt.expected, tt.input, level)
+				}
+			}
+		})
+	}
+}
+
+func TestSetLevel(t *testing.T) {
+	// Store original level to restore later
+	originalLevel := Level.Level()
+	defer Level.Set(originalLevel)
+
+	SetLevel(slog.LevelDebug)
+	if Level.Level() != slog.LevelDebug {
+		t.Errorf("expected Level to be Debug, got %v", Level.Level())
+	}
+
+	SetLevel(slog.LevelError)
+	if Level.Level() != slog.LevelError {
+		t.Errorf("expected Level to be Error, got %v", Level.Level())
+	}
+}
+
+func TestSetOTLPLevel(t *testing.T) {
+	// Store original level to restore later
+	originalLevel := OTLPLevel.Level()
+	defer OTLPLevel.Set(originalLevel)
+
+	SetOTLPLevel(slog.LevelWarn)
+	if OTLPLevel.Level() != slog.LevelWarn {
+		t.Errorf("expected OTLPLevel to be Warn, got %v", OTLPLevel.Level())
+	}
+
+	SetOTLPLevel(slog.LevelDebug)
+	if OTLPLevel.Level() != slog.LevelDebug {
+		t.Errorf("expected OTLPLevel to be Debug, got %v", OTLPLevel.Level())
+	}
+}
+
+func TestOTLPLevelHandler(t *testing.T) {
+	// Create a mock handler that counts calls
+	callCount := 0
+	mockHandler := &mockHandler{
+		handleFunc: func(ctx context.Context, r slog.Record) error {
+			callCount++
+			return nil
+		},
+	}
+
+	// Set OTLP level to Warn
+	originalLevel := OTLPLevel.Level()
+	defer OTLPLevel.Set(originalLevel)
+	OTLPLevel.Set(slog.LevelWarn)
+
+	// Create OTLP level handler
+	handler := newOTLPLevelHandler(mockHandler)
+
+	ctx := context.Background()
+
+	// Test that Debug and Info are filtered out
+	if handler.Enabled(ctx, slog.LevelDebug) {
+		t.Error("Debug level should be disabled when OTLP level is Warn")
+	}
+	if handler.Enabled(ctx, slog.LevelInfo) {
+		t.Error("Info level should be disabled when OTLP level is Warn")
+	}
+
+	// Test that Warn and Error are enabled
+	if !handler.Enabled(ctx, slog.LevelWarn) {
+		t.Error("Warn level should be enabled when OTLP level is Warn")
+	}
+	if !handler.Enabled(ctx, slog.LevelError) {
+		t.Error("Error level should be enabled when OTLP level is Warn")
+	}
+
+	// Test that Handle respects level filtering
+	now := time.Now()
+	debugRecord := slog.NewRecord(now, slog.LevelDebug, "debug message", 0)
+	warnRecord := slog.NewRecord(now, slog.LevelWarn, "warn message", 0)
+
+	handler.Handle(ctx, debugRecord)
+	if callCount != 0 {
+		t.Error("Debug record should not be passed to underlying handler")
+	}
+
+	handler.Handle(ctx, warnRecord)
+	if callCount != 1 {
+		t.Error("Warn record should be passed to underlying handler")
+	}
+}
+
+func TestEnvironmentVariables(t *testing.T) {
+	tests := []struct {
+		name         string
+		envVar       string
+		envValue     string
+		configPrefix string
+		testFunc     func(t *testing.T)
+	}{
+		{
+			name:     "LOG_LEVEL sets stderr level",
+			envVar:   "LOG_LEVEL",
+			envValue: "ERROR",
+			testFunc: func(t *testing.T) {
+				// Reset the setup state
+				resetLoggerSetup()
+
+				// Call setupStdErrHandler which should read the env var
+				handler := setupStdErrHandler()
+				if handler == nil {
+					t.Fatal("setupStdErrHandler returned nil")
+				}
+
+				if Level.Level() != slog.LevelError {
+					t.Errorf("expected Level to be Error after setting LOG_LEVEL=ERROR, got %v", Level.Level())
+				}
+			},
+		},
+		{
+			name:         "Prefixed LOG_LEVEL",
+			envVar:       "TEST_LOG_LEVEL",
+			envValue:     "DEBUG",
+			configPrefix: "TEST",
+			testFunc: func(t *testing.T) {
+				ConfigPrefix = "TEST"
+				defer func() { ConfigPrefix = "" }()
+
+				resetLoggerSetup()
+				handler := setupStdErrHandler()
+				if handler == nil {
+					t.Fatal("setupStdErrHandler returned nil")
+				}
+
+				if Level.Level() != slog.LevelDebug {
+					t.Errorf("expected Level to be Debug after setting TEST_LOG_LEVEL=DEBUG, got %v", Level.Level())
+				}
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			// Store original env value and level
+			originalEnv := os.Getenv(tt.envVar)
+			originalLevel := Level.Level()
+			defer func() {
+				os.Setenv(tt.envVar, originalEnv)
+				Level.Set(originalLevel)
+			}()
+
+			// Set test environment variable
+			os.Setenv(tt.envVar, tt.envValue)
+
+			// Run the test
+			tt.testFunc(t)
+		})
+	}
+}
+
+// mockHandler is a simple mock implementation of slog.Handler for testing
+type mockHandler struct {
+	handleFunc func(ctx context.Context, r slog.Record) error
+}
+
+func (m *mockHandler) Enabled(ctx context.Context, level slog.Level) bool {
+	return true
+}
+
+func (m *mockHandler) Handle(ctx context.Context, r slog.Record) error {
+	if m.handleFunc != nil {
+		return m.handleFunc(ctx, r)
+	}
+	return nil
+}
+
+func (m *mockHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
+	return m
+}
+
+func (m *mockHandler) WithGroup(name string) slog.Handler {
+	return m
+}
+
+// resetLoggerSetup resets the sync.Once instances for testing
+func resetLoggerSetup() {
+	// Reset package-level variables
+	textLogger = nil
+	otlpLogger = nil
+	multiLogger = nil
+
+	// Note: We can't easily reset sync.Once instances in tests,
+	// but for the specific test we're doing (environment variable parsing)
+	// we can test the setupStdErrHandler function directly
+}

logger/logfmt.go

@@ -0,0 +1,97 @@
+package logger
+
+import (
+	"bytes"
+	"context"
+	"log/slog"
+	"slices"
+	"strings"
+	"sync"
+)
+
+type logfmt struct {
+	buf  *bytes.Buffer
+	txt  slog.Handler
+	next slog.Handler
+	mu   sync.Mutex
+}
+
+// createTextHandlerOptions creates the common slog.HandlerOptions used by all logfmt handlers
+func createTextHandlerOptions() *slog.HandlerOptions {
+	return &slog.HandlerOptions{
+		ReplaceAttr: func(groups []string, a slog.Attr) slog.Attr {
+			if a.Key == slog.TimeKey && len(groups) == 0 {
+				return slog.Attr{}
+			}
+			if a.Key == slog.LevelKey && len(groups) == 0 {
+				return slog.Attr{}
+			}
+			return a
+		},
+	}
+}
+
+func newLogFmtHandler(next slog.Handler) slog.Handler {
+	buf := bytes.NewBuffer([]byte{})
+
+	h := &logfmt{
+		buf:  buf,
+		next: next,
+		txt:  slog.NewTextHandler(buf, createTextHandlerOptions()),
+	}
+
+	return h
+}
+
+func (h *logfmt) Enabled(ctx context.Context, lvl slog.Level) bool {
+	return h.next.Enabled(ctx, lvl)
+}
+
+func (h *logfmt) WithAttrs(attrs []slog.Attr) slog.Handler {
+	buf := bytes.NewBuffer([]byte{})
+	return &logfmt{
+		buf:  buf,
+		next: h.next.WithAttrs(slices.Clone(attrs)),
+		txt:  slog.NewTextHandler(buf, createTextHandlerOptions()).WithAttrs(slices.Clone(attrs)),
+	}
+}
+
+func (h *logfmt) WithGroup(g string) slog.Handler {
+	if g == "" {
+		return h
+	}
+	buf := bytes.NewBuffer([]byte{})
+	return &logfmt{
+		buf:  buf,
+		next: h.next.WithGroup(g),
+		txt:  slog.NewTextHandler(buf, createTextHandlerOptions()).WithGroup(g),
+	}
+}
+
+func (h *logfmt) Handle(ctx context.Context, r slog.Record) error {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+
+	if h.buf.Len() > 0 {
+		panic("buffer wasn't empty")
+	}
+
+	// Format using text handler to get the formatted message
+	err := h.txt.Handle(ctx, r)
+	if err != nil {
+		return err
+	}
+
+	formattedMessage := h.buf.String()
+	formattedMessage = strings.TrimSuffix(formattedMessage, "\n")
+	h.buf.Reset()
+
+	// Create a new record with the formatted message
+	newRecord := slog.NewRecord(r.Time, r.Level, formattedMessage, r.PC)
+	r.Attrs(func(a slog.Attr) bool {
+		newRecord.AddAttrs(a)
+		return true
+	})
+
+	return h.next.Handle(ctx, newRecord)
+}

logger/logfmt_test.go

@@ -0,0 +1,41 @@
+package logger
+
+import (
+	"bytes"
+	"encoding/json"
+	"log/slog"
+	"strings"
+	"testing"
+)
+
+func TestLogFmt(t *testing.T) {
+	var buf bytes.Buffer
+	jsonh := slog.NewJSONHandler(&buf, nil)
+	h := newLogFmtHandler(jsonh)
+
+	log := slog.New(h)
+	log.Info("test message", "id", 1010)
+	t.Logf("buf: %s", buf.String())
+
+	msg := map[string]any{}
+
+	err := json.Unmarshal(buf.Bytes(), &msg)
+	if err != nil {
+		t.Logf("couldn't unmarshal json log: %s", err)
+		t.Fail()
+	}
+
+	if msgTxt, ok := msg["msg"].(string); ok {
+		if !strings.Contains(msgTxt, "id=1010") {
+			t.Log("didn't find id in msg value")
+			t.Fail()
+		}
+		if strings.Contains(msgTxt, "level=") {
+			t.Log("msg value contains level=")
+			t.Fail()
+		}
+	} else {
+		t.Log("didn't find message in output")
+		t.Fail()
+	}
+}

logger/logger.go

@@ -1,84 +1,303 @@
+// Package logger provides structured logging with OpenTelemetry trace integration.
+//
+// This package offers multiple logging configurations for different deployment scenarios:
+//   - Text logging to stderr with optional timestamp removal for systemd
+//   - OTLP (OpenTelemetry Protocol) logging for observability pipelines
+//   - Multi-logger setup that outputs to both text and OTLP simultaneously
+//   - Context-aware logging with trace ID correlation
+//
+// The package automatically detects systemd environments and adjusts timestamp handling
+// accordingly. It supports debug level configuration via environment variables and
+// provides compatibility bridges for legacy logging interfaces.
+//
+// Key features:
+//   - Automatic OpenTelemetry trace and span ID inclusion in log entries
+//   - Configurable log levels via DEBUG environment variable (with optional prefix)
+//   - Systemd-compatible output (no timestamps when INVOCATION_ID is present)
+//   - Thread-safe logger setup with sync.Once protection
+//   - Context propagation for request-scoped logging
+//
+// Environment variables:
+//   - LOG_LEVEL: Set stderr log level (DEBUG, INFO, WARN, ERROR) (configurable prefix via ConfigPrefix)
+//   - OTLP_LOG_LEVEL: Set OTLP log level independently (configurable prefix via ConfigPrefix)
+//   - DEBUG: Enable debug level logging for backward compatibility (configurable prefix via ConfigPrefix)
+//   - INVOCATION_ID: Systemd detection for timestamp handling
 package logger
 
 import (
 	"context"
+	"fmt"
 	"log"
 	"log/slog"
 	"os"
 	"strconv"
 	"sync"
+	"time"
 
-	slogotel "github.com/remychantenay/slog-otel"
+	slogtraceid "github.com/remychantenay/slog-otel"
+	slogmulti "github.com/samber/slog-multi"
+	"go.opentelemetry.io/contrib/bridges/otelslog"
+	"go.opentelemetry.io/otel/log/global"
+	otellog "go.opentelemetry.io/otel/sdk/log"
 )
 
+// ConfigPrefix allows customizing the environment variable prefix for configuration.
+// When set, environment variables like DEBUG become {ConfigPrefix}_DEBUG.
+// This enables multiple services to have independent logging configuration.
 var ConfigPrefix = ""
 
-var rootLogger *slog.Logger
+var (
-var setup sync.Once
+	// Level controls the log level for the default stderr logger.
+	// Can be changed at runtime to adjust logging verbosity.
+	Level = new(slog.LevelVar) // Info by default
 
-func Setup() *slog.Logger {
+	// OTLPLevel controls the log level for OTLP output.
+	// Can be changed independently from the stderr logger level.
+	OTLPLevel = new(slog.LevelVar) // Info by default
+)
 
-	setup.Do(func() {
+var (
+	textLogger  *slog.Logger
+	otlpLogger  *slog.Logger
+	multiLogger *slog.Logger
+)
 
-		var programLevel = new(slog.LevelVar) // Info by default
+var (
+	setupText  sync.Once // this sets the default
+	setupOtlp  sync.Once // this never sets the default
+	setupMulti sync.Once // this sets the default, and will always run after the others
+	mu         sync.Mutex
+)
 
-		envVar := "DEBUG"
+// SetLevel sets the log level for the default stderr logger.
+// This affects the primary application logger returned by Setup().
+func SetLevel(level slog.Level) {
+	Level.Set(level)
+}
+
+// SetOTLPLevel sets the log level for OTLP output.
+// This affects the logger returned by SetupOLTP() and the OTLP portion of SetupMultiLogger().
+func SetOTLPLevel(level slog.Level) {
+	OTLPLevel.Set(level)
+}
+
+// ParseLevel converts a string log level to slog.Level.
+// Supported levels: "DEBUG", "INFO", "WARN", "ERROR" (case insensitive).
+// Returns an error for unrecognized level strings.
+func ParseLevel(level string) (slog.Level, error) {
+	switch {
+	case level == "":
+		return slog.LevelInfo, nil
+	case level == "DEBUG" || level == "debug":
+		return slog.LevelDebug, nil
+	case level == "INFO" || level == "info":
+		return slog.LevelInfo, nil
+	case level == "WARN" || level == "warn":
+		return slog.LevelWarn, nil
+	case level == "ERROR" || level == "error":
+		return slog.LevelError, nil
+	default:
+		return slog.LevelInfo, fmt.Errorf("unknown log level: %s", level)
+	}
+}
+
+func setupStdErrHandler() slog.Handler {
+	// Parse LOG_LEVEL environment variable
+	logLevelVar := "LOG_LEVEL"
 	if len(ConfigPrefix) > 0 {
-			envVar = ConfigPrefix + "_" + envVar
+		logLevelVar = ConfigPrefix + "_" + logLevelVar
 	}
 
-		if opt := os.Getenv(envVar); len(opt) > 0 {
+	if levelStr := os.Getenv(logLevelVar); levelStr != "" {
+		if level, err := ParseLevel(levelStr); err == nil {
+			Level.Set(level)
+		}
+	}
+
+	// Maintain backward compatibility with DEBUG environment variable
+	debugVar := "DEBUG"
+	if len(ConfigPrefix) > 0 {
+		debugVar = ConfigPrefix + "_" + debugVar
+	}
+
+	if opt := os.Getenv(debugVar); len(opt) > 0 {
 		if debug, _ := strconv.ParseBool(opt); debug {
-				programLevel.Set(slog.LevelDebug)
+			Level.Set(slog.LevelDebug)
 		}
 	}
 
-		logOptions := &slog.HandlerOptions{Level: programLevel}
+	logOptions := &slog.HandlerOptions{Level: Level}
 
 	if len(os.Getenv("INVOCATION_ID")) > 0 {
 		// don't add timestamps when running under systemd
 		log.Default().SetFlags(0)
 
-			logReplace := func(groups []string, a slog.Attr) slog.Attr {
+		logOptions.ReplaceAttr = logRemoveTime
-				// Remove time
-				if a.Key == slog.TimeKey && len(groups) == 0 {
-					return slog.Attr{}
-				}
-				return a
 	}
 
-			logOptions.ReplaceAttr = logReplace
+	logHandler := slogtraceid.OtelHandler{
-		}
-
-		logHandler := slogotel.OtelHandler{
 		Next: slog.NewTextHandler(os.Stderr, logOptions),
 	}
 
-		// https://github.com/cyrusaf/ctxlog/pull/1
+	return logHandler
-		// log := slog.New(ctxlog.NewHandler(logHandler))
+}
-		log := slog.New(logHandler)
 
-		slog.SetDefault(log)
+func setupOtlpLogger() *slog.Logger {
+	setupOtlp.Do(func() {
+		// Parse OTLP_LOG_LEVEL environment variable
+		otlpLevelVar := "OTLP_LOG_LEVEL"
+		if len(ConfigPrefix) > 0 {
+			otlpLevelVar = ConfigPrefix + "_" + otlpLevelVar
+		}
 
-		rootLogger = log
+		if levelStr := os.Getenv(otlpLevelVar); levelStr != "" {
+			if level, err := ParseLevel(levelStr); err == nil {
+				OTLPLevel.Set(level)
+			}
+		}
 
+		// Create our buffering exporter
+		// It will buffer until tracing is configured
+		bufferingExp := newBufferingExporter()
+
+		// Use BatchProcessor with our custom exporter
+		processor := otellog.NewBatchProcessor(bufferingExp,
+			otellog.WithExportInterval(10*time.Second),
+			otellog.WithMaxQueueSize(2048),
+			otellog.WithExportMaxBatchSize(512),
+		)
+
+		// Create logger provider
+		provider := otellog.NewLoggerProvider(
+			otellog.WithProcessor(processor),
+		)
+
+		// Set global provider
+		global.SetLoggerProvider(provider)
+
+		// Create slog handler with level control
+		baseHandler := newLogFmtHandler(otelslog.NewHandler("common"))
+		handler := newOTLPLevelHandler(baseHandler)
+		otlpLogger = slog.New(handler)
+	})
+	return otlpLogger
+}
+
+// SetupMultiLogger creates a logger that outputs to both text (stderr) and OTLP simultaneously.
+// This is useful for services that need both human-readable logs and structured observability data.
+//
+// The multi-logger combines:
+//   - Text handler: Stderr output with OpenTelemetry trace integration
+//   - OTLP handler: Structured logs sent via OpenTelemetry Protocol
+//
+// On first call, this logger becomes the default logger returned by Setup().
+// The function is thread-safe and uses sync.Once to ensure single initialization.
+func SetupMultiLogger() *slog.Logger {
+	setupMulti.Do(func() {
+		textHandler := Setup().Handler()
+		otlpHandler := setupOtlpLogger().Handler()
+
+		multiHandler := slogmulti.Fanout(
+			textHandler,
+			otlpHandler,
+		)
+		mu.Lock()
+		defer mu.Unlock()
+		multiLogger = slog.New(multiHandler)
+		slog.SetDefault(multiLogger)
 	})
 
-	return rootLogger
+	return multiLogger
+}
+
+// SetupOLTP creates a logger that sends structured logs via OpenTelemetry Protocol.
+// This logger is designed for observability pipelines and log aggregation systems.
+//
+// The OTLP logger formats log messages similarly to the text logger for better
+// compatibility with Loki + Grafana, while still providing structured attributes.
+// Log attributes are available both in the message format and as OTLP attributes.
+//
+// This logger does not become the default logger and must be used explicitly.
+// It requires OpenTelemetry tracing configuration to be set up via the tracing package.
+//
+// See: https://github.com/grafana/loki/issues/14788 for formatting rationale.
+func SetupOLTP() *slog.Logger {
+	return setupOtlpLogger()
+}
+
+// Setup creates and returns the standard text logger for the application.
+// This is the primary logging function that most applications should use.
+//
+// Features:
+//   - Text formatting to stderr with human-readable output
+//   - Automatic OpenTelemetry trace_id and span_id inclusion when available
+//   - Systemd compatibility: omits timestamps when INVOCATION_ID environment variable is present
+//   - Debug level support via DEBUG environment variable (respects ConfigPrefix)
+//   - Thread-safe initialization with sync.Once
+//
+// On first call, this logger becomes the slog default logger. If SetupMultiLogger()
+// has been called previously, Setup() returns the multi-logger instead of the text logger.
+//
+// The logger automatically detects execution context:
+//   - Systemd: Removes timestamps (systemd adds its own)
+//   - Debug mode: Enables debug level logging based on environment variables
+//   - OpenTelemetry: Includes trace correlation when tracing is active
+func Setup() *slog.Logger {
+	setupText.Do(func() {
+		h := setupStdErrHandler()
+		textLogger = slog.New(h)
+		slog.SetDefault(textLogger)
+	})
+
+	mu.Lock()
+	defer mu.Unlock()
+
+	if multiLogger != nil {
+		return multiLogger
+	}
+	return textLogger
 }
 
 type loggerKey struct{}
 
-// NewContext adds the logger to the context.
+// NewContext stores a logger in the context for request-scoped logging.
+// This enables passing request-specific loggers (e.g., with request IDs,
+// user context, or other correlation data) through the call stack.
+//
+// Use this to create context-aware logging where different parts of the
+// application can access the same enriched logger instance.
+//
+// Example:
+//
+//	logger := slog.With("request_id", requestID)
+//	ctx := logger.NewContext(ctx, logger)
+//	// Pass ctx to downstream functions
 func NewContext(ctx context.Context, l *slog.Logger) context.Context {
 	return context.WithValue(ctx, loggerKey{}, l)
 }
 
-// FromContext retrieves a logger from the context. If there is none,
+// FromContext retrieves a logger from the context.
-// it returns the default logger.
+// If no logger is stored in the context, it returns the default logger from Setup().
+//
+// This function provides a safe way to access context-scoped loggers without
+// needing to check for nil values. It ensures that logging is always available,
+// falling back to the application's standard logger configuration.
+//
+// Example:
+//
+//	log := logger.FromContext(ctx)
+//	log.Info("processing request") // Uses context logger or default
 func FromContext(ctx context.Context) *slog.Logger {
 	if l, ok := ctx.Value(loggerKey{}).(*slog.Logger); ok {
 		return l
 	}
 	return Setup()
 }
+
+func logRemoveTime(groups []string, a slog.Attr) slog.Attr {
+	// Remove time
+	if a.Key == slog.TimeKey && len(groups) == 0 {
+		return slog.Attr{}
+	}
+	return a
+}

logger/otlp_handler.go

@@ -0,0 +1,48 @@
+package logger
+
+import (
+	"context"
+	"log/slog"
+)
+
+// otlpLevelHandler is a wrapper that enforces level checking for OTLP handlers.
+// This allows independent level control for OTLP output separate from stderr logging.
+type otlpLevelHandler struct {
+	next slog.Handler
+}
+
+// newOTLPLevelHandler creates a new OTLP level wrapper handler.
+func newOTLPLevelHandler(next slog.Handler) slog.Handler {
+	return &otlpLevelHandler{
+		next: next,
+	}
+}
+
+// Enabled checks if the log level should be processed by the OTLP handler.
+// It uses the OTLPLevel variable to determine if the record should be processed.
+func (h *otlpLevelHandler) Enabled(ctx context.Context, level slog.Level) bool {
+	return level >= OTLPLevel.Level()
+}
+
+// Handle processes the log record if the level is enabled.
+// If disabled by level checking, the record is silently dropped.
+func (h *otlpLevelHandler) Handle(ctx context.Context, r slog.Record) error {
+	if !h.Enabled(ctx, r.Level) {
+		return nil
+	}
+	return h.next.Handle(ctx, r)
+}
+
+// WithAttrs returns a new handler with the specified attributes added.
+func (h *otlpLevelHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
+	return &otlpLevelHandler{
+		next: h.next.WithAttrs(attrs),
+	}
+}
+
+// WithGroup returns a new handler with the specified group name.
+func (h *otlpLevelHandler) WithGroup(name string) slog.Handler {
+	return &otlpLevelHandler{
+		next: h.next.WithGroup(name),
+	}
+}

logger/stdlog.go

@@ -5,12 +5,24 @@ import (
 	"log/slog"
 )
 
+// stdLoggerish provides a bridge between legacy log interfaces and slog.
+// It implements common logging methods (Println, Printf, Fatalf) that
+// delegate to structured logging with a consistent key prefix.
 type stdLoggerish struct {
-	key string
+	key string               // Prefix key for all log messages
-	log *slog.Logger
+	log *slog.Logger         // Underlying structured logger
-	f   func(string, ...any)
+	f   func(string, ...any) // Log function (Info or Debug level)
 }
 
+// NewStdLog creates a legacy-compatible logger that bridges to structured logging.
+// This is useful for third-party libraries that expect a standard log.Logger interface.
+//
+// Parameters:
+//   - key: Prefix added to all log messages for identification
+//   - debug: If true, logs at debug level; otherwise logs at info level
+//   - log: Underlying slog.Logger (uses Setup() if nil)
+//
+// The returned logger implements Println, Printf, and Fatalf methods.
 func NewStdLog(key string, debug bool, log *slog.Logger) *stdLoggerish {
 	if log == nil {
 		log = Setup()
@@ -27,10 +39,19 @@ func NewStdLog(key string, debug bool, log *slog.Logger) *stdLoggerish {
 	return sl
 }
 
-func (l stdLoggerish) Println(msg ...interface{}) {
+// Println logs the arguments using the configured log level with the instance key.
+func (l stdLoggerish) Println(msg ...any) {
 	l.f(l.key, "msg", msg)
 }
 
-func (l stdLoggerish) Printf(msg string, args ...interface{}) {
+// Printf logs a formatted message using the configured log level with the instance key.
+func (l stdLoggerish) Printf(msg string, args ...any) {
 	l.f(l.key, "msg", fmt.Sprintf(msg, args...))
 }
+
+// Fatalf logs a formatted error message and panics.
+// Note: This implementation panics instead of calling os.Exit for testability.
+func (l stdLoggerish) Fatalf(msg string, args ...any) {
+	l.log.Error(l.key, "msg", fmt.Sprintf(msg, args...))
+	panic("fatal error") // todo: does this make sense at all?
+}

logger/type.go

@@ -1,17 +0,0 @@
-package logger
-
-type Error struct {
-	Msg  string
-	Data []any
-}
-
-func NewError(msg string, data ...any) *Error {
-	return &Error{
-		Msg:  msg,
-		Data: data,
-	}
-}
-
-func (e *Error) Error() string {
-	return "not implemented"
-}

metrics/metrics.go

@@ -0,0 +1,122 @@
+// Package metrics provides OpenTelemetry-native metrics with OTLP export support.
+//
+// This package implements a metrics system using the OpenTelemetry metrics data model
+// with OTLP export capabilities. It's designed for new applications that want to use
+// structured metrics export to observability backends.
+//
+// Key features:
+//   - OpenTelemetry native metric types (Counter, Histogram, Gauge, etc.)
+//   - OTLP export for sending metrics to observability backends
+//   - Resource detection and correlation with traces/logs
+//   - Graceful handling when OTLP configuration is not available
+//
+// Example usage:
+//
+//	// Initialize metrics along with tracing
+//	shutdown, err := tracing.InitTracer(ctx, cfg)
+//	if err != nil {
+//		log.Fatal(err)
+//	}
+//	defer shutdown(ctx)
+//
+//	// Get a meter and create instruments
+//	meter := metrics.GetMeter("my-service")
+//	counter, _ := meter.Int64Counter("requests_total")
+//	counter.Add(ctx, 1, metric.WithAttributes(attribute.String("method", "GET")))
+package metrics
+
+import (
+	"context"
+	"log/slog"
+	"sync"
+	"time"
+
+	"go.ntppool.org/common/internal/tracerconfig"
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/metric"
+	sdkmetric "go.opentelemetry.io/otel/sdk/metric"
+)
+
+var (
+	meterProvider metric.MeterProvider
+	setupOnce     sync.Once
+	setupErr      error
+)
+
+// Setup initializes the OpenTelemetry metrics provider with OTLP export.
+// This function uses the configuration stored by the tracing package and
+// creates a metrics provider that exports to the same OTLP endpoint.
+//
+// The function is safe to call multiple times - it will only initialize once.
+// If tracing configuration is not available, it returns a no-op provider that
+// doesn't export metrics.
+//
+// Returns an error only if there's a configuration problem. Missing tracing
+// configuration is handled gracefully with a warning log.
+func Setup(ctx context.Context) error {
+	setupOnce.Do(func() {
+		setupErr = initializeMetrics(ctx)
+	})
+	return setupErr
+}
+
+// GetMeter returns a named meter for creating metric instruments.
+// The meter uses the configured metrics provider, or the global provider
+// if metrics haven't been set up yet.
+//
+// This is the primary entry point for creating metric instruments in your application.
+func GetMeter(name string, opts ...metric.MeterOption) metric.Meter {
+	if meterProvider == nil {
+		// Return the global provider as fallback (no-op if not configured)
+		return otel.GetMeterProvider().Meter(name, opts...)
+	}
+	return meterProvider.Meter(name, opts...)
+}
+
+// initializeMetrics sets up the OpenTelemetry metrics provider with OTLP export.
+func initializeMetrics(ctx context.Context) error {
+	log := slog.Default()
+
+	// Check if tracing configuration is available
+	cfg, configCtx, factory := tracerconfig.GetMetricExporter()
+	if cfg == nil || configCtx == nil || factory == nil {
+		log.Warn("metrics setup: tracing configuration not available, using no-op provider")
+		// Set the global provider as fallback - metrics just won't be exported
+		meterProvider = otel.GetMeterProvider()
+		return nil
+	}
+
+	// Create OTLP metrics exporter
+	exporter, err := factory(ctx, cfg)
+	if err != nil {
+		log.Error("metrics setup: failed to create OTLP exporter", "error", err)
+		// Fall back to global provider
+		meterProvider = otel.GetMeterProvider()
+		return nil
+	}
+
+	// Create metrics provider with the exporter
+	provider := sdkmetric.NewMeterProvider(
+		sdkmetric.WithReader(sdkmetric.NewPeriodicReader(
+			exporter,
+			sdkmetric.WithInterval(15*time.Second),
+		)),
+	)
+
+	// Set the global provider
+	otel.SetMeterProvider(provider)
+	meterProvider = provider
+
+	log.Info("metrics setup: OTLP metrics provider initialized")
+	return nil
+}
+
+// Shutdown gracefully shuts down the metrics provider.
+// This should be called during application shutdown to ensure all metrics
+// are properly flushed and exported.
+func Shutdown(ctx context.Context) error {
+	if provider, ok := meterProvider.(*sdkmetric.MeterProvider); ok {
+		return provider.Shutdown(ctx)
+	}
+	return nil
+}

metrics/metrics_test.go

@@ -0,0 +1,296 @@
+package metrics
+
+import (
+	"context"
+	"os"
+	"testing"
+	"time"
+
+	"go.ntppool.org/common/internal/tracerconfig"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/metric"
+	sdkmetric "go.opentelemetry.io/otel/sdk/metric"
+	"go.opentelemetry.io/otel/sdk/metric/metricdata"
+)
+
+func TestSetup_NoConfiguration(t *testing.T) {
+	// Clear any existing configuration
+	tracerconfig.Clear()
+
+	ctx := context.Background()
+	err := Setup(ctx)
+	// Should not return an error even when no configuration is available
+	if err != nil {
+		t.Errorf("Setup() returned unexpected error: %v", err)
+	}
+
+	// Should be able to get a meter (even if it's a no-op)
+	meter := GetMeter("test-meter")
+	if meter == nil {
+		t.Error("GetMeter() returned nil")
+	}
+}
+
+func TestGetMeter(t *testing.T) {
+	// Clear any existing configuration
+	tracerconfig.Clear()
+
+	ctx := context.Background()
+	_ = Setup(ctx)
+
+	meter := GetMeter("test-service")
+	if meter == nil {
+		t.Fatal("GetMeter() returned nil")
+	}
+
+	// Test creating a counter instrument
+	counter, err := meter.Int64Counter("test_counter")
+	if err != nil {
+		t.Errorf("Failed to create counter: %v", err)
+	}
+
+	// Test using the counter (should not error even with no-op provider)
+	counter.Add(ctx, 1, metric.WithAttributes(attribute.String("test", "value")))
+}
+
+func TestSetup_MultipleCallsSafe(t *testing.T) {
+	// Clear any existing configuration
+	tracerconfig.Clear()
+
+	ctx := context.Background()
+
+	// Call Setup multiple times
+	err1 := Setup(ctx)
+	err2 := Setup(ctx)
+	err3 := Setup(ctx)
+
+	if err1 != nil {
+		t.Errorf("First Setup() call returned error: %v", err1)
+	}
+	if err2 != nil {
+		t.Errorf("Second Setup() call returned error: %v", err2)
+	}
+	if err3 != nil {
+		t.Errorf("Third Setup() call returned error: %v", err3)
+	}
+
+	// Should still be able to get meters
+	meter := GetMeter("test-meter")
+	if meter == nil {
+		t.Error("GetMeter() returned nil after multiple Setup() calls")
+	}
+}
+
+func TestSetup_WithConfiguration(t *testing.T) {
+	// Clear any existing configuration
+	tracerconfig.Clear()
+
+	ctx := context.Background()
+	config := &tracerconfig.Config{
+		ServiceName: "test-metrics-service",
+		Environment: "test",
+		Endpoint:    "localhost:4317", // Will likely fail to connect, but should set up provider
+	}
+
+	// Create a mock exporter factory that returns a working exporter
+	mockFactory := func(ctx context.Context, cfg *tracerconfig.Config) (sdkmetric.Exporter, error) {
+		// Create a simple in-memory exporter for testing
+		return &mockMetricExporter{}, nil
+	}
+
+	// Store configuration with mock factory
+	tracerconfig.Store(ctx, config, nil, mockFactory, nil)
+
+	// Setup metrics
+	err := Setup(ctx)
+	if err != nil {
+		t.Errorf("Setup() returned error: %v", err)
+	}
+
+	// Should be able to get a meter
+	meter := GetMeter("test-service")
+	if meter == nil {
+		t.Fatal("GetMeter() returned nil")
+	}
+
+	// Test creating and using instruments
+	counter, err := meter.Int64Counter("test_counter")
+	if err != nil {
+		t.Errorf("Failed to create counter: %v", err)
+	}
+
+	histogram, err := meter.Float64Histogram("test_histogram")
+	if err != nil {
+		t.Errorf("Failed to create histogram: %v", err)
+	}
+
+	gauge, err := meter.Int64UpDownCounter("test_gauge")
+	if err != nil {
+		t.Errorf("Failed to create gauge: %v", err)
+	}
+
+	// Use the instruments
+	counter.Add(ctx, 1, metric.WithAttributes(attribute.String("test", "value")))
+	histogram.Record(ctx, 1.5, metric.WithAttributes(attribute.String("test", "value")))
+	gauge.Add(ctx, 10, metric.WithAttributes(attribute.String("test", "value")))
+
+	// Test shutdown
+	err = Shutdown(ctx)
+	if err != nil {
+		t.Errorf("Shutdown() returned error: %v", err)
+	}
+}
+
+func TestSetup_WithRealOTLPConfig(t *testing.T) {
+	// Skip this test in short mode since it may try to make network connections
+	if testing.Short() {
+		t.Skip("Skipping integration test in short mode")
+	}
+
+	// Clear any existing configuration
+	tracerconfig.Clear()
+
+	// Set environment variables for OTLP configuration
+	originalEndpoint := os.Getenv("OTEL_EXPORTER_OTLP_ENDPOINT")
+	originalProtocol := os.Getenv("OTEL_EXPORTER_OTLP_PROTOCOL")
+
+	defer func() {
+		if originalEndpoint != "" {
+			os.Setenv("OTEL_EXPORTER_OTLP_ENDPOINT", originalEndpoint)
+		} else {
+			os.Unsetenv("OTEL_EXPORTER_OTLP_ENDPOINT")
+		}
+		if originalProtocol != "" {
+			os.Setenv("OTEL_EXPORTER_OTLP_PROTOCOL", originalProtocol)
+		} else {
+			os.Unsetenv("OTEL_EXPORTER_OTLP_PROTOCOL")
+		}
+	}()
+
+	os.Setenv("OTEL_EXPORTER_OTLP_ENDPOINT", "http://localhost:4318") // HTTP endpoint
+	os.Setenv("OTEL_EXPORTER_OTLP_PROTOCOL", "http/protobuf")
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	config := &tracerconfig.Config{
+		ServiceName: "test-metrics-e2e",
+		Environment: "test",
+		Endpoint:    "localhost:4318",
+	}
+
+	// Store configuration with real factory
+	tracerconfig.Store(ctx, config, nil, tracerconfig.CreateOTLPMetricExporter, nil)
+
+	// Setup metrics - this may fail if no OTLP collector is running, which is okay
+	err := Setup(ctx)
+	if err != nil {
+		t.Logf("Setup() returned error (expected if no OTLP collector): %v", err)
+	}
+
+	// Should still be able to get a meter
+	meter := GetMeter("test-service-e2e")
+	if meter == nil {
+		t.Fatal("GetMeter() returned nil")
+	}
+
+	// Create and use instruments
+	counter, err := meter.Int64Counter("e2e_test_counter")
+	if err != nil {
+		t.Errorf("Failed to create counter: %v", err)
+	}
+
+	// Add some metrics
+	for i := 0; i < 5; i++ {
+		counter.Add(ctx, 1, metric.WithAttributes(
+			attribute.String("iteration", string(rune('0'+i))),
+			attribute.String("test_type", "e2e"),
+		))
+	}
+
+	// Give some time for export (if collector is running)
+	time.Sleep(100 * time.Millisecond)
+
+	// Test shutdown
+	err = Shutdown(ctx)
+	if err != nil {
+		t.Logf("Shutdown() returned error (may be expected): %v", err)
+	}
+}
+
+func TestConcurrentMetricUsage(t *testing.T) {
+	// Clear any existing configuration
+	tracerconfig.Clear()
+
+	ctx := context.Background()
+	config := &tracerconfig.Config{
+		ServiceName: "concurrent-test",
+	}
+
+	// Use mock factory
+	mockFactory := func(ctx context.Context, cfg *tracerconfig.Config) (sdkmetric.Exporter, error) {
+		return &mockMetricExporter{}, nil
+	}
+
+	tracerconfig.Store(ctx, config, nil, mockFactory, nil)
+	Setup(ctx)
+
+	meter := GetMeter("concurrent-test")
+	counter, err := meter.Int64Counter("concurrent_counter")
+	if err != nil {
+		t.Fatalf("Failed to create counter: %v", err)
+	}
+
+	// Test concurrent metric usage
+	const numGoroutines = 10
+	const metricsPerGoroutine = 100
+
+	done := make(chan bool, numGoroutines)
+
+	for i := 0; i < numGoroutines; i++ {
+		go func(goroutineID int) {
+			for j := 0; j < metricsPerGoroutine; j++ {
+				counter.Add(ctx, 1, metric.WithAttributes(
+					attribute.Int("goroutine", goroutineID),
+					attribute.Int("iteration", j),
+				))
+			}
+			done <- true
+		}(i)
+	}
+
+	// Wait for all goroutines to complete
+	for i := 0; i < numGoroutines; i++ {
+		<-done
+	}
+
+	// Shutdown
+	err = Shutdown(ctx)
+	if err != nil {
+		t.Errorf("Shutdown() returned error: %v", err)
+	}
+}
+
+// mockMetricExporter is a simple mock exporter for testing
+type mockMetricExporter struct{}
+
+func (m *mockMetricExporter) Export(ctx context.Context, rm *metricdata.ResourceMetrics) error {
+	// Just pretend to export
+	return nil
+}
+
+func (m *mockMetricExporter) ForceFlush(ctx context.Context) error {
+	return nil
+}
+
+func (m *mockMetricExporter) Shutdown(ctx context.Context) error {
+	return nil
+}
+
+func (m *mockMetricExporter) Temporality(kind sdkmetric.InstrumentKind) metricdata.Temporality {
+	return metricdata.CumulativeTemporality
+}
+
+func (m *mockMetricExporter) Aggregation(kind sdkmetric.InstrumentKind) sdkmetric.Aggregation {
+	return sdkmetric.DefaultAggregationSelector(kind)
+}

metricsserver/metrics.go

@@ -1,3 +1,8 @@
+// Package metricsserver provides a standalone HTTP server for exposing Prometheus metrics.
+//
+// This package implements a dedicated metrics server that exposes application metrics
+// via HTTP. It uses a custom Prometheus registry to avoid conflicts with other metric
+// collectors and provides graceful shutdown capabilities.
 package metricsserver
 
 import (
@@ -13,10 +18,13 @@ import (
 	"go.ntppool.org/common/logger"
 )
 
+// Metrics provides a custom Prometheus registry and HTTP handlers for metrics exposure.
+// It isolates application metrics from the default global registry.
 type Metrics struct {
 	r *prometheus.Registry
 }
 
+// New creates a new Metrics instance with a custom Prometheus registry.
 func New() *Metrics {
 	r := prometheus.NewRegistry()
 
@@ -27,12 +35,14 @@ func New() *Metrics {
 	return m
 }
 
+// Registry returns the custom Prometheus registry.
+// Use this to register your application's metrics collectors.
 func (m *Metrics) Registry() *prometheus.Registry {
 	return m.r
 }
 
+// Handler returns an HTTP handler for the /metrics endpoint with OpenMetrics support.
 func (m *Metrics) Handler() http.Handler {
-
 	log := logger.NewStdLog("prom http", false, nil)
 
 	return promhttp.HandlerFor(m.r, promhttp.HandlerOpts{
@@ -42,11 +52,9 @@ func (m *Metrics) Handler() http.Handler {
 	})
 }
 
-// ListenAndServe starts a goroutine with a server running on
+// ListenAndServe starts a metrics server on the specified port and blocks until ctx is done.
-// the specified port. The server will shutdown and return when
+// The server exposes the metrics handler and shuts down gracefully when the context is cancelled.
-// the provided context is done
 func (m *Metrics) ListenAndServe(ctx context.Context, port int) error {
-
 	log := logger.Setup()
 
 	srv := &http.Server{

metricsserver/metrics_test.go

@@ -0,0 +1,242 @@
+package metricsserver
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+func TestNew(t *testing.T) {
+	metrics := New()
+
+	if metrics == nil {
+		t.Fatal("New returned nil")
+	}
+
+	if metrics.r == nil {
+		t.Error("metrics registry is nil")
+	}
+}
+
+func TestRegistry(t *testing.T) {
+	metrics := New()
+	registry := metrics.Registry()
+
+	if registry == nil {
+		t.Fatal("Registry() returned nil")
+	}
+
+	if registry != metrics.r {
+		t.Error("Registry() did not return the metrics registry")
+	}
+
+	// Test that we can register a metric
+	counter := prometheus.NewCounter(prometheus.CounterOpts{
+		Name: "test_counter",
+		Help: "A test counter",
+	})
+
+	err := registry.Register(counter)
+	if err != nil {
+		t.Errorf("failed to register metric: %v", err)
+	}
+
+	// Test that the metric is registered
+	metricFamilies, err := registry.Gather()
+	if err != nil {
+		t.Errorf("failed to gather metrics: %v", err)
+	}
+
+	found := false
+	for _, mf := range metricFamilies {
+		if mf.GetName() == "test_counter" {
+			found = true
+			break
+		}
+	}
+
+	if !found {
+		t.Error("registered metric not found in registry")
+	}
+}
+
+func TestHandler(t *testing.T) {
+	metrics := New()
+
+	// Register a test metric
+	counter := prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "test_requests_total",
+			Help: "Total number of test requests",
+		},
+		[]string{"method"},
+	)
+	metrics.Registry().MustRegister(counter)
+	counter.WithLabelValues("GET").Inc()
+
+	// Test the handler
+	handler := metrics.Handler()
+	if handler == nil {
+		t.Fatal("Handler() returned nil")
+	}
+
+	// Create a test request
+	req := httptest.NewRequest("GET", "/metrics", nil)
+	recorder := httptest.NewRecorder()
+
+	// Call the handler
+	handler.ServeHTTP(recorder, req)
+
+	// Check response
+	resp := recorder.Result()
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		t.Errorf("expected status 200, got %d", resp.StatusCode)
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		t.Fatalf("failed to read response body: %v", err)
+	}
+
+	bodyStr := string(body)
+
+	// Check for our test metric
+	if !strings.Contains(bodyStr, "test_requests_total") {
+		t.Error("test metric not found in metrics output")
+	}
+
+	// Check for OpenMetrics format indicators
+	if !strings.Contains(bodyStr, "# TYPE") {
+		t.Error("metrics output missing TYPE comments")
+	}
+}
+
+func TestListenAndServe(t *testing.T) {
+	metrics := New()
+
+	// Register a test metric
+	counter := prometheus.NewCounterVec(
+		prometheus.CounterOpts{
+			Name: "test_requests_total",
+			Help: "Total number of test requests",
+		},
+		[]string{"method"},
+	)
+	metrics.Registry().MustRegister(counter)
+	counter.WithLabelValues("GET").Inc()
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	// Start server in a goroutine
+	errCh := make(chan error, 1)
+	go func() {
+		// Use a high port number to avoid conflicts
+		errCh <- metrics.ListenAndServe(ctx, 9999)
+	}()
+
+	// Give the server a moment to start
+	time.Sleep(100 * time.Millisecond)
+
+	// Test metrics endpoint
+	resp, err := http.Get("http://localhost:9999/metrics")
+	if err != nil {
+		t.Fatalf("failed to GET /metrics: %v", err)
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		t.Errorf("expected status 200, got %d", resp.StatusCode)
+	}
+
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		t.Fatalf("failed to read response body: %v", err)
+	}
+
+	bodyStr := string(body)
+
+	// Check for our test metric
+	if !strings.Contains(bodyStr, "test_requests_total") {
+		t.Error("test metric not found in metrics output")
+	}
+
+	// Cancel context to stop server
+	cancel()
+
+	// Wait for server to stop
+	select {
+	case err := <-errCh:
+		if err != nil {
+			t.Errorf("server returned error: %v", err)
+		}
+	case <-time.After(5 * time.Second):
+		t.Error("server did not stop within timeout")
+	}
+}
+
+func TestListenAndServeContextCancellation(t *testing.T) {
+	metrics := New()
+
+	ctx, cancel := context.WithCancel(context.Background())
+
+	// Start server
+	errCh := make(chan error, 1)
+	go func() {
+		errCh <- metrics.ListenAndServe(ctx, 9998)
+	}()
+
+	// Give server time to start
+	time.Sleep(100 * time.Millisecond)
+
+	// Cancel context
+	cancel()
+
+	// Server should stop gracefully
+	select {
+	case err := <-errCh:
+		if err != nil {
+			t.Errorf("server returned error on graceful shutdown: %v", err)
+		}
+	case <-time.After(5 * time.Second):
+		t.Error("server did not stop within timeout after context cancellation")
+	}
+}
+
+// Benchmark the metrics handler response time
+func BenchmarkMetricsHandler(b *testing.B) {
+	metrics := New()
+
+	// Register some test metrics
+	for i := 0; i < 10; i++ {
+		counter := prometheus.NewCounter(prometheus.CounterOpts{
+			Name: fmt.Sprintf("bench_counter_%d", i),
+			Help: "A benchmark counter",
+		})
+		metrics.Registry().MustRegister(counter)
+		counter.Add(float64(i * 100))
+	}
+
+	handler := metrics.Handler()
+
+	b.ResetTimer()
+
+	for i := 0; i < b.N; i++ {
+		req := httptest.NewRequest("GET", "/metrics", nil)
+		recorder := httptest.NewRecorder()
+		handler.ServeHTTP(recorder, req)
+
+		if recorder.Code != http.StatusOK {
+			b.Fatalf("unexpected status code: %d", recorder.Code)
+		}
+	}
+}

scripts/download-release

@@ -15,7 +15,7 @@ mkdir -p $DIR
 
 BASE=https://geodns.bitnames.com/${BASE}/builds/${BUILD}
 
-files=`curl -sSf ${BASE}/checksums.txt | awk '{print $2}'`
+files=`curl -sSf ${BASE}/checksums.txt | sed 's/^[a-f0-9]*[[:space:]]*//'`
 metafiles="checksums.txt metadata.json CHANGELOG.md artifacts.json"
 
 for f in $metafiles; do

scripts/run-goreleaser

@@ -2,7 +2,7 @@
 
 set -euo pipefail
 
-go install github.com/goreleaser/goreleaser@v1.24.0
+go install github.com/goreleaser/goreleaser/v2@v2.11.0
 
 if [ ! -z "${harbor_username:-}" ]; then
   DOCKER_FILE=~/.docker/config.json

timeutil/duration.go

@@ -1,3 +1,4 @@
+// Package timeutil provides JSON-serializable time utilities.
 package timeutil
 
 import (
@@ -6,16 +7,39 @@ import (
 	"time"
 )
 
+// Duration is a wrapper around time.Duration that supports JSON marshaling/unmarshaling.
+//
+// When marshaling to JSON, it outputs the duration as a string using time.Duration.String().
+// When unmarshaling from JSON, it accepts both:
+//   - String values that can be parsed by time.ParseDuration (e.g., "30s", "5m", "1h30m")
+//   - Numeric values that represent nanoseconds as a float64
+//
+// This makes it compatible with configuration files and APIs that need to represent
+// durations in a human-readable format.
+//
+// Example usage:
+//
+//	type Config struct {
+//		Timeout timeutil.Duration `json:"timeout"`
+//	}
+//
+//	// JSON: {"timeout": "30s"}
+//	// or:   {"timeout": 30000000000}
 type Duration struct {
 	time.Duration
 }
 
+// MarshalJSON implements json.Marshaler.
+// It marshals the duration as a string using time.Duration.String().
 func (d Duration) MarshalJSON() ([]byte, error) {
 	return json.Marshal(time.Duration(d.Duration).String())
 }
 
+// UnmarshalJSON implements json.Unmarshaler.
+// It accepts both string values (parsed via time.ParseDuration) and
+// numeric values (interpreted as nanoseconds).
 func (d *Duration) UnmarshalJSON(b []byte) error {
-	var v interface{}
+	var v any
 	if err := json.Unmarshal(b, &v); err != nil {
 		return err
 	}

timeutil/duration_test.go

@@ -18,5 +18,4 @@ func TestDuration(t *testing.T) {
 	if foo.Foo.Seconds() != 30 {
 		t.Fatalf("parsed time.Duration wasn't 30 seconds: %s", foo.Foo)
 	}
-
 }

tracing/tracing.go

@@ -1,3 +1,36 @@
+// Package tracing provides OpenTelemetry distributed tracing setup with OTLP export support.
+//
+// This package handles the complete OpenTelemetry SDK initialization including:
+//   - Trace provider configuration with batching and resource detection
+//   - Log provider setup for structured log export via OTLP
+//   - Automatic resource discovery (service name, version, host, container, process info)
+//   - Support for both gRPC and HTTP OTLP exporters with TLS configuration
+//   - Propagation context setup for distributed tracing across services
+//   - Graceful shutdown handling for all telemetry components
+//
+// The package supports various deployment scenarios:
+//   - Development: Local OTLP collectors or observability backends
+//   - Production: Secure OTLP export with mutual TLS authentication
+//   - Container environments: Automatic container and Kubernetes resource detection
+//
+// Configuration is primarily handled via standard OpenTelemetry environment variables:
+//   - OTEL_SERVICE_NAME: Service identification
+//   - OTEL_EXPORTER_OTLP_PROTOCOL: Protocol selection (grpc, http/protobuf)
+//   - OTEL_TRACES_EXPORTER: Exporter type (otlp, autoexport)
+//   - OTEL_RESOURCE_ATTRIBUTES: Additional resource attributes
+//
+// Example usage:
+//
+//	cfg := &tracing.TracerConfig{
+//		ServiceName: "my-service",
+//		Environment: "production",
+//		Endpoint:    "https://otlp.example.com:4317",
+//	}
+//	shutdown, err := tracing.InitTracer(ctx, cfg)
+//	if err != nil {
+//		log.Fatal(err)
+//	}
+//	defer shutdown(ctx)
 package tracing
 
 // todo, review:
@@ -5,168 +38,251 @@ package tracing
 
 import (
 	"context"
-	"crypto/tls"
 	"crypto/x509"
+	"errors"
+	"log/slog"
 	"os"
+	"slices"
+	"time"
 
-	"go.ntppool.org/common/logger"
+	"go.ntppool.org/common/internal/tracerconfig"
 	"go.ntppool.org/common/version"
 
+	"go.opentelemetry.io/contrib/exporters/autoexport"
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/attribute"
-	"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
+	"go.opentelemetry.io/otel/log/global"
-	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
 	"go.opentelemetry.io/otel/propagation"
+	sdklog "go.opentelemetry.io/otel/sdk/log"
+	sdkmetric "go.opentelemetry.io/otel/sdk/metric"
 	"go.opentelemetry.io/otel/sdk/resource"
-	otelsdktrace "go.opentelemetry.io/otel/sdk/trace"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
-	semconv "go.opentelemetry.io/otel/semconv/v1.24.0"
+	semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
 	"go.opentelemetry.io/otel/trace"
 )
 
+const (
+	// svcNameKey is the environment variable name that Service Name information will be read from.
+	svcNameKey = "OTEL_SERVICE_NAME"
+)
+
+// createOTLPLogExporter creates an OTLP log exporter using the provided configuration.
+// This function is used as the LogExporterFactory for the tracerconfig bridge.
+func createOTLPLogExporter(ctx context.Context, cfg *tracerconfig.Config) (sdklog.Exporter, error) {
+	return tracerconfig.CreateOTLPLogExporter(ctx, cfg)
+}
+
+// createOTLPMetricExporter creates an OTLP metric exporter using the provided configuration.
+// This function is used as the MetricExporterFactory for the tracerconfig bridge.
+func createOTLPMetricExporter(ctx context.Context, cfg *tracerconfig.Config) (sdkmetric.Exporter, error) {
+	return tracerconfig.CreateOTLPMetricExporter(ctx, cfg)
+}
+
+// createOTLPTraceExporter creates an OTLP trace exporter using the provided configuration.
+// This function is used as the TraceExporterFactory for the tracerconfig bridge.
+func createOTLPTraceExporter(ctx context.Context, cfg *tracerconfig.Config) (sdktrace.SpanExporter, error) {
+	return tracerconfig.CreateOTLPTraceExporter(ctx, cfg)
+}
+
 // https://github.com/open-telemetry/opentelemetry-go/blob/main/exporters/otlp/otlptrace/otlptracehttp/example_test.go
 
+// TpShutdownFunc represents a function that gracefully shuts down telemetry providers.
+// It should be called during application shutdown to ensure all telemetry data is flushed
+// and exporters are properly closed. The context can be used to set shutdown timeouts.
 type TpShutdownFunc func(ctx context.Context) error
 
+// Tracer returns the configured OpenTelemetry tracer for the NTP Pool project.
+// This tracer should be used for creating spans and distributed tracing throughout
+// the application. It uses the global tracer provider set up by InitTracer/SetupSDK.
 func Tracer() trace.Tracer {
 	traceProvider := otel.GetTracerProvider()
 	return traceProvider.Tracer("ntppool-tracer")
 }
 
+// Start creates a new span with the given name and options using the configured tracer.
+// This is a convenience function that wraps the standard OpenTelemetry span creation.
+// It returns a new context containing the span and the span itself for further configuration.
+//
+// The returned context should be used for downstream operations to maintain trace correlation.
 func Start(ctx context.Context, spanName string, opts ...trace.SpanStartOption) (context.Context, trace.Span) {
 	return Tracer().Start(ctx, spanName, opts...)
 }
 
-type GetClientCertificate func(*tls.CertificateRequestInfo) (*tls.Certificate, error)
+// GetClientCertificate is an alias for the type defined in tracerconfig.
+// This maintains backward compatibility for existing code.
+type GetClientCertificate = tracerconfig.GetClientCertificate
 
+// TracerConfig provides configuration options for OpenTelemetry tracing setup.
+// It supplements standard OpenTelemetry environment variables with additional
+// NTP Pool-specific configuration including TLS settings for secure OTLP export.
 type TracerConfig struct {
-	ServiceName string
+	ServiceName string // Service name for resource identification (overrides OTEL_SERVICE_NAME)
-	Environment string
+	Environment string // Deployment environment (development, staging, production)
-	Endpoint    string
+	Endpoint    string // OTLP endpoint hostname/port (e.g., "otlp.example.com:4317")
-	EndpointURL string
+	EndpointURL string // Complete OTLP endpoint URL (e.g., "https://otlp.example.com:4317/v1/traces")
 
-	CertificateProvider GetClientCertificate
+	CertificateProvider GetClientCertificate // Client certificate provider for mutual TLS
-	RootCAs             *x509.CertPool
+	RootCAs             *x509.CertPool       // CA certificate pool for server verification
-}
-
-var emptyTpShutdownFunc = func(_ context.Context) error {
-	return nil
 }
 
+// InitTracer initializes the OpenTelemetry SDK with the provided configuration.
+// This is the main entry point for setting up distributed tracing in applications.
+//
+// The function configures trace and log providers, sets up OTLP exporters,
+// and returns a shutdown function that must be called during application termination.
+//
+// Returns a shutdown function and an error. The shutdown function should be called
+// with a context that has an appropriate timeout for graceful shutdown.
 func InitTracer(ctx context.Context, cfg *TracerConfig) (TpShutdownFunc, error) {
+	// todo: setup environment from cfg
+	return SetupSDK(ctx, cfg)
+}
 
-	log := logger.Setup()
+// SetupSDK performs the complete OpenTelemetry SDK initialization including resource
+// discovery, exporter configuration, provider setup, and shutdown function creation.
+//
+// The function automatically discovers system resources (service info, host, container,
+// process details) and configures both trace and log exporters. It supports multiple
+// OTLP protocols (gRPC, HTTP) and handles TLS configuration for secure deployments.
+//
+// The returned shutdown function coordinates graceful shutdown of all telemetry
+// components in the reverse order of their initialization.
+func SetupSDK(ctx context.Context, cfg *TracerConfig) (shutdown TpShutdownFunc, err error) {
+	if cfg == nil {
+		cfg = &TracerConfig{}
+	}
 
-	// exporter, err := srv.newStdoutExporter(os.Stdout)
+	// Store configuration for use by logger and metrics packages via bridge
+	bridgeConfig := &tracerconfig.Config{
+		ServiceName:         cfg.ServiceName,
+		Environment:         cfg.Environment,
+		Endpoint:            cfg.Endpoint,
+		EndpointURL:         cfg.EndpointURL,
+		CertificateProvider: cfg.CertificateProvider,
+		RootCAs:             cfg.RootCAs,
+	}
+	tracerconfig.Store(ctx, bridgeConfig, createOTLPLogExporter, createOTLPMetricExporter, createOTLPTraceExporter)
+
+	log := slog.Default()
+
+	if serviceName := os.Getenv(svcNameKey); len(serviceName) == 0 {
+		if len(cfg.ServiceName) > 0 {
+			os.Setenv(svcNameKey, cfg.ServiceName)
+		}
+	}
+
+	resources := []resource.Option{
+		resource.WithFromEnv(),      // Discover and provide attributes from OTEL_RESOURCE_ATTRIBUTES and OTEL_SERVICE_NAME environment variables.
+		resource.WithTelemetrySDK(), // Discover and provide information about the OpenTelemetry SDK used.
+		resource.WithProcess(),      // Discover and provide process information.
+		resource.WithOS(),           // Discover and provide OS information.
+		resource.WithContainer(),    // Discover and provide container information.
+		resource.WithHost(),         // Discover and provide host information.
+
+		// set above via os.Setenv() for WithFromEnv to find
+		// resource.WithAttributes(semconv.ServiceNameKey.String(cfg.ServiceName)),
+
+		resource.WithAttributes(semconv.ServiceVersionKey.String(version.Version())),
+	}
+
+	if len(cfg.Environment) > 0 {
+		resources = append(resources,
+			resource.WithAttributes(attribute.String("environment", cfg.Environment)),
+		)
+	}
+
+	res, err := resource.New(
+		context.Background(),
+		resources...,
+	)
+	if errors.Is(err, resource.ErrPartialResource) || errors.Is(err, resource.ErrSchemaURLConflict) {
+		log.Warn("otel resource setup", "err", err) // Log non-fatal issues.
+	} else if err != nil {
+		log.Error("otel resource setup", "err", err)
+		return
+	}
+
+	var shutdownFuncs []func(context.Context) error
+	shutdown = func(ctx context.Context) error {
+		// Force flush the global logger provider before shutting down anything else
+		if loggerProvider := global.GetLoggerProvider(); loggerProvider != nil {
+			if sdkProvider, ok := loggerProvider.(*sdklog.LoggerProvider); ok {
+				if flushErr := sdkProvider.ForceFlush(ctx); flushErr != nil {
+					log.Warn("logger provider force flush failed", "err", flushErr)
+				}
+			}
+		}
 
 		var err error
-	var exporter otelsdktrace.SpanExporter
+		// need to shutdown the providers first,
-
+		// exporters after which is the opposite
-	if otlpEndPoint := os.Getenv("OTEL_EXPORTER_OTLP_ENDPOINT"); len(otlpEndPoint) > 0 || len(cfg.Endpoint) > 0 {
+		// order they are setup.
-		exporter, err = newOLTPExporter(ctx, cfg)
+		slices.Reverse(shutdownFuncs)
+		for _, fn := range shutdownFuncs {
+			err = errors.Join(err, fn(ctx))
 		}
+		shutdownFuncs = nil
+		if err != nil {
+			log.Warn("shutdown returned errors", "err", err)
+		}
+		return err
+	}
+
+	// handleErr calls shutdown for cleanup and makes sure that all errors are returned.
+	handleErr := func(inErr error) {
+		err = errors.Join(inErr, shutdown(ctx))
+	}
+
+	prop := newPropagator()
+	otel.SetTextMapPropagator(prop)
+
+	var spanExporter sdktrace.SpanExporter
+
+	switch os.Getenv("OTEL_TRACES_EXPORTER") {
+	case "":
+		spanExporter, err = createOTLPTraceExporter(ctx, bridgeConfig)
+	case "otlp":
+		spanExporter, err = createOTLPTraceExporter(ctx, bridgeConfig)
+	default:
+		// log.Debug("OTEL_TRACES_EXPORTER", "fallback", os.Getenv("OTEL_TRACES_EXPORTER"))
+		spanExporter, err = autoexport.NewSpanExporter(ctx)
+	}
+	if err != nil {
+		handleErr(err)
+		return
+	}
+	shutdownFuncs = append(shutdownFuncs, spanExporter.Shutdown)
+
+	// Set up trace provider.
+	tracerProvider, err := newTraceProvider(spanExporter, res)
+	if err != nil {
+		handleErr(err)
+		return
+	}
+	shutdownFuncs = append(shutdownFuncs, tracerProvider.Shutdown)
+	otel.SetTracerProvider(tracerProvider)
 
 	if err != nil {
-		return emptyTpShutdownFunc, err
+		handleErr(err)
+		return
 	}
 
-	if exporter == nil {
+	return
-		log.Warn("tracing not configured")
+}
-		return emptyTpShutdownFunc, nil
-	}
 
-	resource, err := newResource(cfg)
+func newTraceProvider(traceExporter sdktrace.SpanExporter, res *resource.Resource) (*sdktrace.TracerProvider, error) {
-	if err != nil {
+	traceProvider := sdktrace.NewTracerProvider(
-		return nil, err
+		sdktrace.WithResource(res),
-	}
+		sdktrace.WithBatcher(traceExporter,
-
+			sdktrace.WithBatchTimeout(time.Second*3),
-	tp := otelsdktrace.NewTracerProvider(
-		otelsdktrace.WithSampler(otelsdktrace.AlwaysSample()),
-		otelsdktrace.WithBatcher(exporter),
-		otelsdktrace.WithResource(resource),
-	)
-
-	otel.SetTracerProvider(tp)
-
-	otel.SetTextMapPropagator(
-		propagation.NewCompositeTextMapPropagator(
-			propagation.TraceContext{}, // W3C Trace Context format; https://www.w3.org/TR/trace-context/
-			propagation.Baggage{},
 		),
 	)
-
+	return traceProvider, nil
-	return tp.Shutdown, nil
 }
 
-func newOLTPExporter(ctx context.Context, cfg *TracerConfig) (otelsdktrace.SpanExporter, error) {
+func newPropagator() propagation.TextMapPropagator {
-
+	return propagation.NewCompositeTextMapPropagator(
-	log := logger.Setup()
+		propagation.TraceContext{},
-
+		propagation.Baggage{},
-	opts := []otlptracehttp.Option{
+	)
-		otlptracehttp.WithCompression(otlptracehttp.GzipCompression),
-	}
-
-	if cfg.CertificateProvider != nil {
-		log.InfoContext(ctx, "setting up cert provider")
-		opts = append(opts, otlptracehttp.WithTLSClientConfig(&tls.Config{
-			GetClientCertificate: cfg.CertificateProvider,
-			RootCAs:              cfg.RootCAs,
-		}))
-	}
-
-	if len(cfg.Endpoint) > 0 {
-		opts = append(opts, otlptracehttp.WithEndpoint(cfg.Endpoint))
-	}
-
-	if len(cfg.EndpointURL) > 0 {
-		opts = append(opts, otlptracehttp.WithEndpointURL(cfg.EndpointURL))
-	}
-
-	client := otlptracehttp.NewClient(opts...)
-	exporter, err := otlptrace.New(ctx, client)
-	if err != nil {
-		log.ErrorContext(ctx, "creating OTLP trace exporter", "err", err)
-	}
-	return exporter, err
-}
-
-// func (srv *Server) newStdoutExporter(w io.Writer) (sdktrace.SpanExporter, error) {
-// 	return stdouttrace.New(
-// 		stdouttrace.WithWriter(w),
-// 		// Use human-readable output.
-// 		stdouttrace.WithPrettyPrint(),
-// 		// Do not print timestamps for the demo.
-// 		stdouttrace.WithoutTimestamps(),
-// 	)
-// }
-
-// newResource returns a resource describing this application.
-func newResource(cfg *TracerConfig) (*resource.Resource, error) {
-
-	log := logger.Setup()
-
-	defaultResource := resource.Default()
-	log.Debug("default semconv", "url", defaultResource.SchemaURL())
-
-	newResource := resource.NewWithAttributes(
-		semconv.SchemaURL,
-		semconv.ServiceNameKey.String(cfg.ServiceName),
-		semconv.ServiceVersionKey.String(version.Version()),
-		attribute.String("environment", cfg.Environment),
-	)
-
-	log.Debug("new resource semconv", "url", newResource.SchemaURL())
-
-	r, err := resource.Merge(
-		defaultResource,
-		newResource,
-	)
-	if err != nil {
-		log.Error("could not setup otel resource",
-			"err", err,
-			"default", defaultResource.SchemaURL(),
-			"local", newResource.SchemaURL(),
-		)
-	}
-
-	return r, nil
 }

tracing/tracing_test.go

@@ -7,7 +7,6 @@ import (
 )
 
 func TestInit(t *testing.T) {
-
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
@@ -18,5 +17,4 @@ func TestInit(t *testing.T) {
 		t.FailNow()
 	}
 	defer shutdownFn(ctx)
-
 }

types/log_scores.go

@@ -1,3 +1,17 @@
+// Package types provides shared data structures for the NTP Pool project.
+//
+// This package contains common types used across different NTP Pool services
+// for data exchange, logging, and database operations. The types are designed
+// to support JSON serialization for API responses and SQL database storage
+// with automatic marshaling/unmarshaling.
+//
+// Current types include:
+//   - LogScoreAttributes: NTP server scoring metadata for monitoring and analysis
+//
+// All types implement appropriate interfaces for:
+//   - JSON serialization (json.Marshaler/json.Unmarshaler)
+//   - SQL database storage (database/sql/driver.Valuer/sql.Scanner)
+//   - String representation for logging and debugging
 package types
 
 import (
@@ -6,17 +20,26 @@ import (
 	"errors"
 )
 
+// LogScoreAttributes contains metadata about NTP server scoring and monitoring results.
+// This structure captures both NTP protocol-specific information (leap, stratum) and
+// operational data (errors, warnings, response status) for analysis and alerting.
+//
+// The type supports JSON serialization for API responses and database storage
+// via the database/sql/driver interfaces. Fields use omitempty tags to minimize
+// JSON payload size when values are at their zero state.
 type LogScoreAttributes struct {
-	Leap       int8   `json:"leap,omitempty"`
+	Leap       int8   `json:"leap,omitempty"`        // NTP leap indicator (0=no warning, 1=+1s, 2=-1s, 3=unsynchronized)
-	Stratum    int8   `json:"stratum,omitempty"`
+	Stratum    int8   `json:"stratum,omitempty"`     // NTP stratum level (1=primary, 2-15=secondary, 16=unsynchronized)
-	NoResponse bool   `json:"no_response,omitempty"`
+	NoResponse bool   `json:"no_response,omitempty"` // True if server failed to respond to NTP queries
-	Error      string `json:"error,omitempty"`
+	Error      string `json:"error,omitempty"`       // Error message if scoring failed
-	Warning    string `json:"warning,omitempty"`
+	Warning    string `json:"warning,omitempty"`     // Warning message for non-fatal issues
 
-	FromLSID int `json:"from_ls_id,omitempty"`
+	FromLSID int `json:"from_ls_id,omitempty"` // Source log server ID for traceability
-	FromSSID int `json:"from_ss_id,omitempty"`
+	FromSSID int `json:"from_ss_id,omitempty"` // Source scoring system ID for traceability
 }
 
+// String returns a JSON representation of the LogScoreAttributes for logging and debugging.
+// Returns an empty string if JSON marshaling fails.
 func (lsa *LogScoreAttributes) String() string {
 	b, err := json.Marshal(lsa)
 	if err != nil {
@@ -25,11 +48,18 @@ func (lsa *LogScoreAttributes) String() string {
 	return string(b)
 }
 
+// Value implements the database/sql/driver.Valuer interface for database storage.
+// It serializes the LogScoreAttributes to JSON for storage in SQL databases.
+// Returns the JSON bytes or an error if marshaling fails.
 func (lsa *LogScoreAttributes) Value() (driver.Value, error) {
 	return json.Marshal(lsa)
 }
 
-func (lsa *LogScoreAttributes) Scan(value interface{}) error {
+// Scan implements the database/sql.Scanner interface for reading from SQL databases.
+// It deserializes JSON data from the database back into LogScoreAttributes.
+// Supports both []byte and string input types, with nil values treated as no-op.
+// Returns an error if the input type is unsupported or JSON unmarshaling fails.
+func (lsa *LogScoreAttributes) Scan(value any) error {
 	var source []byte
 	_t := LogScoreAttributes{}
 

ulid/ulid.go

@@ -1,48 +1,44 @@
+// Package ulid provides thread-safe ULID (Universally Unique Lexicographically Sortable Identifier) generation.
+//
+// ULIDs are 128-bit identifiers that are lexicographically sortable and contain
+// a timestamp component. This package uses cryptographically secure random
+// generation optimized for simplicity and performance in concurrent environments.
 package ulid
 
 import (
 	cryptorand "crypto/rand"
-	"encoding/binary"
-	"io"
-	mathrand "math/rand"
-	"os"
-	"sync"
 	"time"
 
 	oklid "github.com/oklog/ulid/v2"
-	"go.ntppool.org/common/logger"
 )
 
-var monotonicPool = sync.Pool{
+// MakeULID generates a new ULID with the specified timestamp using cryptographically secure randomness.
-	New: func() interface{} {
+// The function is thread-safe and optimized for high-concurrency environments.
-
+//
-		log := logger.Setup()
+// This implementation prioritizes simplicity and performance over strict monotonicity within
-
+// the same millisecond. Each ULID is guaranteed to be unique and lexicographically sortable
-		var seed int64
+// across different timestamps.
-		err := binary.Read(cryptorand.Reader, binary.BigEndian, &seed)
+//
-		if err != nil {
+// Returns a pointer to the generated ULID or an error if generation fails.
-			log.Error("crypto/rand error", "err", err)
+// Generation should only fail under extreme circumstances (entropy exhaustion).
-			os.Exit(10)
-		}
-
-		rand := mathrand.New(mathrand.NewSource(seed))
-
-		inc := uint64(mathrand.Int63())
-
-		// log.Printf("seed: %d", seed)
-		// log.Printf("inc:  %d", inc)
-
-		// inc = inc & ^uint64(1<<63) // only want 63 bits
-		mono := oklid.Monotonic(rand, inc)
-		return mono
-	},
-}
-
 func MakeULID(t time.Time) (*oklid.ULID, error) {
-
+	id, err := oklid.New(oklid.Timestamp(t), cryptorand.Reader)
-	mono := monotonicPool.Get().(io.Reader)
+	if err != nil {
-
+		return nil, err
-	id, err := oklid.New(oklid.Timestamp(t), mono)
+	}
+
+	return &id, nil
+}
+
+// Make generates a new ULID with the current timestamp using cryptographically secure randomness.
+// This is a convenience function equivalent to MakeULID(time.Now()).
+//
+// The function is thread-safe and optimized for high-concurrency environments.
+//
+// Returns a pointer to the generated ULID or an error if generation fails.
+// Generation should only fail under extreme circumstances (entropy exhaustion).
+func Make() (*oklid.ULID, error) {
+	id, err := oklid.New(oklid.Now(), cryptorand.Reader)
 	if err != nil {
 		return nil, err
 	}

ulid/ulid_test.go

@@ -1,25 +1,336 @@
 package ulid
 
 import (
+	cryptorand "crypto/rand"
+	"sort"
+	"sync"
 	"testing"
 	"time"
+
+	oklid "github.com/oklog/ulid/v2"
 )
 
-func TestULID(t *testing.T) {
+func TestMakeULID(t *testing.T) {
 	tm := time.Now()
 	ul1, err := MakeULID(tm)
 	if err != nil {
-		t.Logf("makeULID failed: %s", err)
+		t.Fatalf("MakeULID failed: %s", err)
-		t.Fail()
 	}
 	ul2, err := MakeULID(tm)
 	if err != nil {
-		t.Logf("MakeULID failed: %s", err)
+		t.Fatalf("MakeULID failed: %s", err)
-		t.Fail()
 	}
+
+	if ul1 == nil || ul2 == nil {
+		t.Fatal("MakeULID returned nil ULID")
+	}
+
 	if ul1.String() == ul2.String() {
-		t.Logf("ul1 and ul2 got the same string: %s", ul1.String())
+		t.Errorf("ul1 and ul2 should be different: %s", ul1.String())
-		t.Fail()
 	}
+
+	// Verify they have the same timestamp
+	if ul1.Time() != ul2.Time() {
+		t.Errorf("ULIDs with same input time should have same timestamp: %d != %d", ul1.Time(), ul2.Time())
+	}
+
 	t.Logf("ulid string 1 and 2: %s | %s", ul1.String(), ul2.String())
 }
+
+func TestMake(t *testing.T) {
+	// Test Make() function (uses current time)
+	ul1, err := Make()
+	if err != nil {
+		t.Fatalf("Make failed: %s", err)
+	}
+
+	if ul1 == nil {
+		t.Fatal("Make returned nil ULID")
+	}
+
+	// Sleep a bit and generate another
+	time.Sleep(2 * time.Millisecond)
+
+	ul2, err := Make()
+	if err != nil {
+		t.Fatalf("Make failed: %s", err)
+	}
+
+	// Should be different ULIDs
+	if ul1.String() == ul2.String() {
+		t.Errorf("ULIDs from Make() should be different: %s", ul1.String())
+	}
+
+	// Second should be later (or at least not earlier)
+	if ul1.Time() > ul2.Time() {
+		t.Errorf("second ULID should not have earlier timestamp: %d > %d", ul1.Time(), ul2.Time())
+	}
+
+	t.Logf("Make() ULIDs: %s | %s", ul1.String(), ul2.String())
+}
+
+func TestMakeULIDUniqueness(t *testing.T) {
+	tm := time.Now()
+	seen := make(map[string]bool)
+
+	for i := 0; i < 1000; i++ {
+		ul, err := MakeULID(tm)
+		if err != nil {
+			t.Fatalf("MakeULID failed on iteration %d: %s", i, err)
+		}
+
+		str := ul.String()
+		if seen[str] {
+			t.Errorf("duplicate ULID generated: %s", str)
+		}
+		seen[str] = true
+	}
+}
+
+func TestMakeUniqueness(t *testing.T) {
+	seen := make(map[string]bool)
+
+	for i := 0; i < 1000; i++ {
+		ul, err := Make()
+		if err != nil {
+			t.Fatalf("Make failed on iteration %d: %s", i, err)
+		}
+
+		str := ul.String()
+		if seen[str] {
+			t.Errorf("duplicate ULID generated: %s", str)
+		}
+		seen[str] = true
+	}
+}
+
+func TestMakeULIDTimestampProgression(t *testing.T) {
+	t1 := time.Now()
+	ul1, err := MakeULID(t1)
+	if err != nil {
+		t.Fatalf("MakeULID failed: %s", err)
+	}
+
+	// Wait to ensure different timestamp
+	time.Sleep(2 * time.Millisecond)
+
+	t2 := time.Now()
+	ul2, err := MakeULID(t2)
+	if err != nil {
+		t.Fatalf("MakeULID failed: %s", err)
+	}
+
+	if ul1.Time() >= ul2.Time() {
+		t.Errorf("second ULID should have later timestamp: %d >= %d", ul1.Time(), ul2.Time())
+	}
+
+	if ul1.Compare(*ul2) >= 0 {
+		t.Errorf("second ULID should be greater: %s >= %s", ul1.String(), ul2.String())
+	}
+}
+
+func TestMakeULIDConcurrency(t *testing.T) {
+	const numGoroutines = 10
+	const numULIDsPerGoroutine = 100
+
+	var wg sync.WaitGroup
+	ulidChan := make(chan *oklid.ULID, numGoroutines*numULIDsPerGoroutine)
+	tm := time.Now()
+
+	// Start multiple goroutines generating ULIDs concurrently
+	for i := 0; i < numGoroutines; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			for j := 0; j < numULIDsPerGoroutine; j++ {
+				ul, err := MakeULID(tm)
+				if err != nil {
+					t.Errorf("MakeULID failed: %s", err)
+					return
+				}
+				ulidChan <- ul
+			}
+		}()
+	}
+
+	wg.Wait()
+	close(ulidChan)
+
+	// Collect all ULIDs and check uniqueness
+	seen := make(map[string]bool)
+	count := 0
+
+	for ul := range ulidChan {
+		str := ul.String()
+		if seen[str] {
+			t.Errorf("duplicate ULID generated in concurrent test: %s", str)
+		}
+		seen[str] = true
+		count++
+	}
+
+	if count != numGoroutines*numULIDsPerGoroutine {
+		t.Errorf("expected %d ULIDs, got %d", numGoroutines*numULIDsPerGoroutine, count)
+	}
+}
+
+func TestMakeConcurrency(t *testing.T) {
+	const numGoroutines = 10
+	const numULIDsPerGoroutine = 100
+
+	var wg sync.WaitGroup
+	ulidChan := make(chan *oklid.ULID, numGoroutines*numULIDsPerGoroutine)
+
+	// Start multiple goroutines generating ULIDs concurrently
+	for i := 0; i < numGoroutines; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			for j := 0; j < numULIDsPerGoroutine; j++ {
+				ul, err := Make()
+				if err != nil {
+					t.Errorf("Make failed: %s", err)
+					return
+				}
+				ulidChan <- ul
+			}
+		}()
+	}
+
+	wg.Wait()
+	close(ulidChan)
+
+	// Collect all ULIDs and check uniqueness
+	seen := make(map[string]bool)
+	count := 0
+
+	for ul := range ulidChan {
+		str := ul.String()
+		if seen[str] {
+			t.Errorf("duplicate ULID generated in concurrent test: %s", str)
+		}
+		seen[str] = true
+		count++
+	}
+
+	if count != numGoroutines*numULIDsPerGoroutine {
+		t.Errorf("expected %d ULIDs, got %d", numGoroutines*numULIDsPerGoroutine, count)
+	}
+}
+
+func TestMakeULIDErrorHandling(t *testing.T) {
+	// Test with various timestamps
+	timestamps := []time.Time{
+		time.Unix(0, 0),           // Unix epoch
+		time.Now(),                // Current time
+		time.Now().Add(time.Hour), // Future time
+	}
+
+	for i, tm := range timestamps {
+		ul, err := MakeULID(tm)
+		if err != nil {
+			t.Errorf("MakeULID failed with timestamp %d: %s", i, err)
+		}
+		if ul == nil {
+			t.Errorf("MakeULID returned nil ULID with timestamp %d", i)
+		}
+	}
+}
+
+func TestMakeULIDLexicographicOrdering(t *testing.T) {
+	var ulids []*oklid.ULID
+	var timestamps []time.Time
+
+	// Generate ULIDs with increasing timestamps
+	for i := 0; i < 10; i++ {
+		tm := time.Now().Add(time.Duration(i) * time.Millisecond)
+		timestamps = append(timestamps, tm)
+
+		ul, err := MakeULID(tm)
+		if err != nil {
+			t.Fatalf("MakeULID failed: %s", err)
+		}
+		ulids = append(ulids, ul)
+
+		// Small delay to ensure different timestamps
+		time.Sleep(time.Millisecond)
+	}
+
+	// Sort ULID strings lexicographically
+	ulidStrings := make([]string, len(ulids))
+	for i, ul := range ulids {
+		ulidStrings[i] = ul.String()
+	}
+
+	originalOrder := make([]string, len(ulidStrings))
+	copy(originalOrder, ulidStrings)
+
+	sort.Strings(ulidStrings)
+
+	// Verify lexicographic order matches chronological order
+	for i := 0; i < len(originalOrder); i++ {
+		if originalOrder[i] != ulidStrings[i] {
+			t.Errorf("lexicographic order doesn't match chronological order at index %d: %s != %s",
+				i, originalOrder[i], ulidStrings[i])
+		}
+	}
+}
+
+// Benchmark ULID generation performance
+func BenchmarkMakeULID(b *testing.B) {
+	tm := time.Now()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_, err := MakeULID(tm)
+		if err != nil {
+			b.Fatalf("MakeULID failed: %s", err)
+		}
+	}
+}
+
+// Benchmark Make function
+func BenchmarkMake(b *testing.B) {
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_, err := Make()
+		if err != nil {
+			b.Fatalf("Make failed: %s", err)
+		}
+	}
+}
+
+// Benchmark concurrent ULID generation
+func BenchmarkMakeULIDConcurrent(b *testing.B) {
+	tm := time.Now()
+
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			_, err := MakeULID(tm)
+			if err != nil {
+				b.Fatalf("MakeULID failed: %s", err)
+			}
+		}
+	})
+}
+
+// Benchmark concurrent Make function
+func BenchmarkMakeConcurrent(b *testing.B) {
+	b.RunParallel(func(pb *testing.PB) {
+		for pb.Next() {
+			_, err := Make()
+			if err != nil {
+				b.Fatalf("Make failed: %s", err)
+			}
+		}
+	})
+}
+
+// Benchmark random number generation
+func BenchmarkCryptoRand(b *testing.B) {
+	buf := make([]byte, 10) // ULID entropy size
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		cryptorand.Read(buf)
+	}
+}

version/version.go

@@ -1,34 +1,88 @@
+// Package version provides build metadata and version information management.
+//
+// This package manages application version information including semantic version,
+// Git revision, build time, and provides integration with CLI frameworks (Cobra, Kong)
+// and Prometheus metrics for operational visibility.
+//
+// Version information can be injected at build time using ldflags:
+//
+//	go build -ldflags "-X go.ntppool.org/common/version.VERSION=v1.0.0 \
+//	  -X go.ntppool.org/common/version.buildTime=2023-01-01T00:00:00Z \
+//	  -X go.ntppool.org/common/version.gitVersion=abc123"
+//
+// Build time supports both Unix epoch timestamps and RFC3339 format:
+//
+//	# Unix epoch (simpler, recommended)
+//	go build -ldflags "-X go.ntppool.org/common/version.buildTime=$(date +%s)"
+//
+//	# RFC3339 format
+//	go build -ldflags "-X go.ntppool.org/common/version.buildTime=$(date -u +%Y-%m-%dT%H:%M:%SZ)"
+//
+// Both formats are automatically converted to RFC3339 for consistent output. The buildTime
+// parameter takes priority over Git commit time. If buildTime is not specified, the package
+// automatically extracts build information from Go's debug.BuildInfo when available,
+// providing fallback values for VCS time and revision.
 package version
 
 import (
 	"fmt"
+	"log/slog"
 	"runtime"
 	"runtime/debug"
+	"strconv"
 	"strings"
+	"time"
 
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/spf13/cobra"
-	"go.ntppool.org/common/logger"
 	"golang.org/x/mod/semver"
 )
 
-// VERSION has the current software version (set in the build process)
+// VERSION contains the current software version (typically set during the build process via ldflags).
-var VERSION string
+// If not set, defaults to "dev-snapshot". The version should follow semantic versioning.
-var buildTime string
+var (
-var gitVersion string
+	VERSION     string // Semantic version (e.g., "1.0.0" or "v1.0.0")
-var gitModified bool
+	buildTime   string // Build timestamp (Unix epoch or RFC3339, normalized to RFC3339)
+	gitVersion  string // Git commit hash
+	gitModified bool   // Whether the working tree was modified during build
+)
 
+// info holds the consolidated version information extracted from build variables and debug.BuildInfo.
 var info Info
 
+// parseBuildTime converts a build time string to RFC3339 format.
+// Supports both Unix epoch timestamps (numeric strings) and RFC3339 format.
+// Returns the input unchanged if it cannot be parsed as either format.
+func parseBuildTime(s string) string {
+	if s == "" {
+		return s
+	}
+
+	// Try parsing as Unix epoch timestamp (numeric string)
+	if epoch, err := strconv.ParseInt(s, 10, 64); err == nil {
+		return time.Unix(epoch, 0).UTC().Format(time.RFC3339)
+	}
+
+	// Try parsing as RFC3339 to validate format
+	if _, err := time.Parse(time.RFC3339, s); err == nil {
+		return s // Already in RFC3339 format
+	}
+
+	// Return original string if neither format works (graceful fallback)
+	return s
+}
+
+// Info represents structured version and build information.
+// This struct is used for JSON serialization and programmatic access to build metadata.
 type Info struct {
-	Version     string `json:",omitempty"`
+	Version     string `json:",omitempty"` // Semantic version with "v" prefix
-	GitRev      string `json:",omitempty"`
+	GitRev      string `json:",omitempty"` // Full Git commit hash
-	GitRevShort string `json:",omitempty"`
+	GitRevShort string `json:",omitempty"` // Shortened Git commit hash (7 characters)
-	BuildTime   string `json:",omitempty"`
+	BuildTime   string `json:",omitempty"` // Build timestamp
 }
 
 func init() {
-
+	buildTime = parseBuildTime(buildTime)
 	info.BuildTime = buildTime
 	info.GitRev = gitVersion
 
@@ -39,7 +93,7 @@ func init() {
 			VERSION = "v" + VERSION
 		}
 		if !semver.IsValid(VERSION) {
-			logger.Setup().Warn("invalid version number", "version", VERSION)
+			slog.Default().Warn("invalid version number", "version", VERSION)
 		}
 	}
 	if bi, ok := debug.ReadBuildInfo(); ok {
@@ -48,9 +102,9 @@ func init() {
 			switch h.Key {
 			case "vcs.time":
 				if len(buildTime) == 0 {
-					buildTime = h.Value
+					buildTime = parseBuildTime(h.Value)
+					info.BuildTime = buildTime
 				}
-				info.BuildTime = h.Value
 			case "vcs.revision":
 				// https://blog.carlmjohnson.net/post/2023/golang-git-hash-how-to/
 				// todo: use BuildInfo.Main.Version if revision is empty
@@ -78,10 +132,16 @@ func init() {
 	Version()
 }
 
+// VersionCmd creates a Cobra command for displaying version information.
+// The name parameter is used as a prefix in the output (e.g., "myapp v1.0.0").
+// Returns a configured cobra.Command that can be added to any CLI application.
 func VersionCmd(name string) *cobra.Command {
 	versionCmd := &cobra.Command{
 		Use:   "version",
 		Short: "Print version and build information",
+		Long: `Print detailed version information including semantic version,
+Git revision, build time, and Go version. Build information is automatically
+extracted from Go's debug.BuildInfo when available.`,
 		Run: func(cmd *cobra.Command, args []string) {
 			ver := Version()
 			fmt.Printf("%s %s\n", name, ver)
@@ -90,6 +150,23 @@ func VersionCmd(name string) *cobra.Command {
 	return versionCmd
 }
 
+// KongVersionCmd provides a Kong CLI framework compatible version command.
+// The Name field should be set to the application name for proper output formatting.
+type KongVersionCmd struct {
+	Name string `kong:"-"` // Application name, excluded from Kong parsing
+}
+
+// Run executes the version command for Kong CLI framework.
+// Prints the application name and version information to stdout.
+func (cmd *KongVersionCmd) Run() error {
+	fmt.Printf("%s %s\n", cmd.Name, Version())
+	return nil
+}
+
+// RegisterMetric registers a Prometheus gauge metric with build information.
+// If name is provided, it creates a metric named "{name}_build_info", otherwise "build_info".
+// The metric includes labels for version, build time, Git time, and Git revision.
+// This is useful for exposing build information in monitoring systems.
 func RegisterMetric(name string, registry prometheus.Registerer) {
 	if len(name) > 0 {
 		name = strings.ReplaceAll(name, "-", "_")
@@ -100,13 +177,13 @@ func RegisterMetric(name string, registry prometheus.Registerer) {
 	buildInfo := prometheus.NewGaugeVec(
 		prometheus.GaugeOpts{
 			Name: name,
-			Help: "Build information",
+			Help: "Build information including version, build time, and git revision",
 		},
 		[]string{
-			"version",
+			"version",   // Combined version/git format (e.g., "v1.0.0/abc123")
-			"buildtime",
+			"buildtime", // Build timestamp from ldflags
-			"gittime",
+			"gittime",   // Git commit timestamp from VCS info
-			"git",
+			"git",       // Full Git commit hash
 		},
 	)
 	registry.MustRegister(buildInfo)
@@ -121,12 +198,20 @@ func RegisterMetric(name string, registry prometheus.Registerer) {
 	).Set(1)
 }
 
+// v caches the formatted version string to avoid repeated computation.
 var v string
 
+// VersionInfo returns the structured version information.
+// This provides programmatic access to version details for JSON serialization
+// or other structured uses.
 func VersionInfo() Info {
 	return info
 }
 
+// Version returns a human-readable version string suitable for display.
+// The format includes semantic version, Git revision, build time, and Go version.
+// Example: "v1.0.0/abc123f-M (2023-01-01T00:00:00Z, go1.21.0)"
+// The "-M" suffix indicates the working tree was modified during build.
 func Version() string {
 	if len(v) > 0 {
 		return v
@@ -153,3 +238,27 @@ func Version() string {
 	v = fmt.Sprintf("%s (%s)", v, strings.Join(extra, ", "))
 	return v
 }
+
+// CheckVersion compares a version against a minimum required version.
+// Returns true if the version meets or exceeds the minimum requirement.
+//
+// Special handling:
+//   - "dev-snapshot" is always considered valid (returns true)
+//   - Git hash suffixes (e.g., "v1.0.0/abc123") are stripped before comparison
+//   - Uses semantic version comparison rules
+//
+// Both version and minimumVersion should follow semantic versioning with "v" prefix.
+func CheckVersion(version, minimumVersion string) bool {
+	if version == "dev-snapshot" {
+		return true
+	}
+	// Strip Git hash suffix if present (e.g., "v1.0.0/abc123" -> "v1.0.0")
+	if idx := strings.Index(version, "/"); idx >= 0 {
+		version = version[0:idx]
+	}
+	if semver.Compare(version, minimumVersion) < 0 {
+		// log.Debug("version too old", "v", cl.Version.Version)
+		return false
+	}
+	return true
+}

version/version_test.go

@@ -0,0 +1,414 @@
+package version
+
+import (
+	"runtime"
+	"strings"
+	"testing"
+
+	"github.com/prometheus/client_golang/prometheus"
+	dto "github.com/prometheus/client_model/go"
+)
+
+func TestCheckVersion(t *testing.T) {
+	tests := []struct {
+		In       string
+		Min      string
+		Expected bool
+	}{
+		// Basic version comparisons
+		{"v3.8.4", "v3.8.5", false},
+		{"v3.9.3", "v3.8.5", true},
+		{"v3.8.5", "v3.8.5", true},
+		// Dev snapshot should always pass
+		{"dev-snapshot", "v3.8.5", true},
+		{"dev-snapshot", "v99.99.99", true},
+		// Versions with Git hashes should be stripped
+		{"v3.8.5/abc123", "v3.8.5", true},
+		{"v3.8.4/abc123", "v3.8.5", false},
+		{"v3.9.0/def456", "v3.8.5", true},
+		// Pre-release versions
+		{"v3.8.5-alpha", "v3.8.5", false},
+		{"v3.8.5", "v3.8.5-alpha", true},
+		{"v3.8.5-beta", "v3.8.5-alpha", true},
+	}
+
+	for _, d := range tests {
+		r := CheckVersion(d.In, d.Min)
+		if r != d.Expected {
+			t.Errorf("CheckVersion(%q, %q) = %t, expected %t", d.In, d.Min, r, d.Expected)
+		}
+	}
+}
+
+func TestVersionInfo(t *testing.T) {
+	info := VersionInfo()
+
+	// Check that we get a valid Info struct
+	if info.Version == "" {
+		t.Error("VersionInfo().Version should not be empty")
+	}
+
+	// Version should start with "v" or be "dev-snapshot"
+	if !strings.HasPrefix(info.Version, "v") && info.Version != "dev-snapshot" {
+		t.Errorf("Version should start with 'v' or be 'dev-snapshot', got: %s", info.Version)
+	}
+
+	// GitRevShort should be <= 7 characters if set
+	if info.GitRevShort != "" && len(info.GitRevShort) > 7 {
+		t.Errorf("GitRevShort should be <= 7 characters, got: %s", info.GitRevShort)
+	}
+
+	// GitRevShort should be prefix of GitRev if both are set
+	if info.GitRev != "" && info.GitRevShort != "" {
+		if !strings.HasPrefix(info.GitRev, info.GitRevShort) {
+			t.Errorf("GitRevShort should be prefix of GitRev: %s not prefix of %s",
+				info.GitRevShort, info.GitRev)
+		}
+	}
+}
+
+func TestVersion(t *testing.T) {
+	version := Version()
+
+	if version == "" {
+		t.Error("Version() should not return empty string")
+	}
+
+	// Should contain Go version
+	if !strings.Contains(version, runtime.Version()) {
+		t.Errorf("Version should contain Go version %s, got: %s", runtime.Version(), version)
+	}
+
+	// Should contain the VERSION variable (or dev-snapshot)
+	info := VersionInfo()
+	if !strings.Contains(version, info.Version) {
+		t.Errorf("Version should contain %s, got: %s", info.Version, version)
+	}
+
+	// Should be in expected format: "version (extras)"
+	if !strings.Contains(version, "(") || !strings.Contains(version, ")") {
+		t.Errorf("Version should be in format 'version (extras)', got: %s", version)
+	}
+}
+
+func TestVersionCmd(t *testing.T) {
+	appName := "testapp"
+	cmd := VersionCmd(appName)
+
+	// Test basic command properties
+	if cmd.Use != "version" {
+		t.Errorf("Expected command use to be 'version', got: %s", cmd.Use)
+	}
+
+	if cmd.Short == "" {
+		t.Error("Command should have a short description")
+	}
+
+	if cmd.Long == "" {
+		t.Error("Command should have a long description")
+	}
+
+	if cmd.Run == nil {
+		t.Error("Command should have a Run function")
+	}
+
+	// Test that the command can be executed without error
+	cmd.SetArgs([]string{})
+	err := cmd.Execute()
+	if err != nil {
+		t.Errorf("VersionCmd execution should not return error, got: %s", err)
+	}
+}
+
+func TestKongVersionCmd(t *testing.T) {
+	cmd := &KongVersionCmd{Name: "testapp"}
+
+	// Test that Run() doesn't return an error
+	err := cmd.Run()
+	if err != nil {
+		t.Errorf("KongVersionCmd.Run() should not return error, got: %s", err)
+	}
+}
+
+func TestRegisterMetric(t *testing.T) {
+	// Create a test registry
+	registry := prometheus.NewRegistry()
+
+	// Test registering metric without name
+	RegisterMetric("", registry)
+
+	// Gather metrics
+	metricFamilies, err := registry.Gather()
+	if err != nil {
+		t.Fatalf("Failed to gather metrics: %s", err)
+	}
+
+	// Find the build_info metric
+	var buildInfoFamily *dto.MetricFamily
+	for _, family := range metricFamilies {
+		if family.GetName() == "build_info" {
+			buildInfoFamily = family
+			break
+		}
+	}
+
+	if buildInfoFamily == nil {
+		t.Fatal("build_info metric not found")
+	}
+
+	if buildInfoFamily.GetHelp() == "" {
+		t.Error("build_info metric should have help text")
+	}
+
+	metrics := buildInfoFamily.GetMetric()
+	if len(metrics) == 0 {
+		t.Fatal("build_info metric should have at least one sample")
+	}
+
+	// Check that the metric has the expected labels
+	metric := metrics[0]
+	labels := metric.GetLabel()
+
+	expectedLabels := []string{"version", "buildtime", "gittime", "git"}
+	labelMap := make(map[string]string)
+
+	for _, label := range labels {
+		labelMap[label.GetName()] = label.GetValue()
+	}
+
+	for _, expectedLabel := range expectedLabels {
+		if _, exists := labelMap[expectedLabel]; !exists {
+			t.Errorf("Expected label %s not found in metric", expectedLabel)
+		}
+	}
+
+	// Check that the metric value is 1
+	if metric.GetGauge().GetValue() != 1 {
+		t.Errorf("Expected build_info metric value to be 1, got %f", metric.GetGauge().GetValue())
+	}
+}
+
+func TestRegisterMetricWithName(t *testing.T) {
+	// Create a test registry
+	registry := prometheus.NewRegistry()
+
+	// Test registering metric with custom name
+	appName := "my-test-app"
+	RegisterMetric(appName, registry)
+
+	// Gather metrics
+	metricFamilies, err := registry.Gather()
+	if err != nil {
+		t.Fatalf("Failed to gather metrics: %s", err)
+	}
+
+	// Find the my_test_app_build_info metric
+	expectedName := "my_test_app_build_info"
+	var buildInfoFamily *dto.MetricFamily
+	for _, family := range metricFamilies {
+		if family.GetName() == expectedName {
+			buildInfoFamily = family
+			break
+		}
+	}
+
+	if buildInfoFamily == nil {
+		t.Fatalf("%s metric not found", expectedName)
+	}
+}
+
+func TestVersionConsistency(t *testing.T) {
+	// Call Version() multiple times and ensure it returns the same result
+	v1 := Version()
+	v2 := Version()
+
+	if v1 != v2 {
+		t.Errorf("Version() should return consistent results: %s != %s", v1, v2)
+	}
+}
+
+func TestVersionInfoConsistency(t *testing.T) {
+	// Ensure VersionInfo() is consistent with Version()
+	info := VersionInfo()
+	version := Version()
+
+	// Version string should contain the semantic version
+	if !strings.Contains(version, info.Version) {
+		t.Errorf("Version() should contain VersionInfo().Version: %s not in %s",
+			info.Version, version)
+	}
+
+	// If GitRevShort is set, version should contain it
+	if info.GitRevShort != "" {
+		if !strings.Contains(version, info.GitRevShort) {
+			t.Errorf("Version() should contain GitRevShort: %s not in %s",
+				info.GitRevShort, version)
+		}
+	}
+}
+
+// Test edge cases
+func TestCheckVersionEdgeCases(t *testing.T) {
+	// Test with empty strings
+	if CheckVersion("", "v1.0.0") {
+		t.Error("Empty version should not be >= v1.0.0")
+	}
+
+	// Test with malformed versions (should be handled gracefully)
+	// Note: semver.Compare might panic or return unexpected results for invalid versions
+	// but our function should handle the common cases
+	tests := []struct {
+		version string
+		minimum string
+		desc    string
+	}{
+		{"v1.0.0/", "v1.0.0", "version with trailing slash"},
+		{"v1.0.0/abc/def", "v1.0.0", "version with multiple slashes"},
+	}
+
+	for _, test := range tests {
+		// This should not panic
+		result := CheckVersion(test.version, test.minimum)
+		t.Logf("%s: CheckVersion(%q, %q) = %t", test.desc, test.version, test.minimum, result)
+	}
+}
+
+// Benchmark version operations
+func BenchmarkVersion(b *testing.B) {
+	// Reset the cached version to test actual computation
+	v = ""
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_ = Version()
+	}
+}
+
+func BenchmarkVersionInfo(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		_ = VersionInfo()
+	}
+}
+
+func BenchmarkCheckVersion(b *testing.B) {
+	version := "v1.2.3/abc123"
+	minimum := "v1.2.0"
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_ = CheckVersion(version, minimum)
+	}
+}
+
+func BenchmarkCheckVersionDevSnapshot(b *testing.B) {
+	version := "dev-snapshot"
+	minimum := "v1.2.0"
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_ = CheckVersion(version, minimum)
+	}
+}
+
+func TestParseBuildTime(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    string
+		expected string
+	}{
+		{
+			name:     "Unix epoch timestamp",
+			input:    "1672531200", // 2023-01-01T00:00:00Z
+			expected: "2023-01-01T00:00:00Z",
+		},
+		{
+			name:     "Unix epoch zero",
+			input:    "0",
+			expected: "1970-01-01T00:00:00Z",
+		},
+		{
+			name:     "Valid RFC3339 format",
+			input:    "2023-12-25T15:30:45Z",
+			expected: "2023-12-25T15:30:45Z",
+		},
+		{
+			name:     "RFC3339 with timezone",
+			input:    "2023-12-25T10:30:45-05:00",
+			expected: "2023-12-25T10:30:45-05:00",
+		},
+		{
+			name:     "Empty string",
+			input:    "",
+			expected: "",
+		},
+		{
+			name:     "Invalid format - return unchanged",
+			input:    "not-a-date",
+			expected: "not-a-date",
+		},
+		{
+			name:     "Invalid timestamp - return unchanged",
+			input:    "invalid-timestamp",
+			expected: "invalid-timestamp",
+		},
+		{
+			name:     "Partial date - return unchanged",
+			input:    "2023-01-01",
+			expected: "2023-01-01",
+		},
+		{
+			name:     "Negative epoch - should work",
+			input:    "-1",
+			expected: "1969-12-31T23:59:59Z",
+		},
+		{
+			name:     "Large epoch timestamp",
+			input:    "4102444800", // 2100-01-01T00:00:00Z
+			expected: "2100-01-01T00:00:00Z",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			result := parseBuildTime(tt.input)
+			if result != tt.expected {
+				t.Errorf("parseBuildTime(%q) = %q, expected %q", tt.input, result, tt.expected)
+			}
+		})
+	}
+}
+
+func TestParseBuildTimeConsistency(t *testing.T) {
+	// Test that calling parseBuildTime multiple times with the same input returns the same result
+	testInputs := []string{
+		"1672531200",
+		"2023-01-01T00:00:00Z",
+		"invalid-date",
+		"",
+	}
+
+	for _, input := range testInputs {
+		result1 := parseBuildTime(input)
+		result2 := parseBuildTime(input)
+		if result1 != result2 {
+			t.Errorf("parseBuildTime(%q) not consistent: %q != %q", input, result1, result2)
+		}
+	}
+}
+
+func BenchmarkParseBuildTime(b *testing.B) {
+	inputs := []string{
+		"1672531200",                 // Unix epoch
+		"2023-01-01T00:00:00Z",      // RFC3339
+		"invalid-timestamp",          // Invalid
+		"",                          // Empty
+	}
+
+	for _, input := range inputs {
+		b.Run(input, func(b *testing.B) {
+			for i := 0; i < b.N; i++ {
+				_ = parseBuildTime(input)
+			}
+		})
+	}
+}

xff/fastlyxff/xff.go

@@ -1,3 +1,27 @@
+// Package fastlyxff provides Fastly CDN IP range management for trusted proxy handling.
+//
+// This package parses Fastly's public IP ranges JSON file and generates Echo framework
+// trust options for proper client IP extraction from X-Forwarded-For headers.
+// It's designed specifically for services deployed behind Fastly's CDN that need
+// to identify real client IPs for logging, rate limiting, and security purposes.
+//
+// Fastly publishes their edge server IP ranges in a JSON format that this package
+// consumes to automatically configure trusted proxy ranges. This ensures that
+// X-Forwarded-For headers are only trusted when they originate from legitimate
+// Fastly edge servers.
+//
+// Key features:
+//   - Automatic parsing of Fastly's IP ranges JSON format
+//   - Support for both IPv4 and IPv6 address ranges
+//   - Echo framework integration via TrustOption generation
+//   - CIDR notation parsing and validation
+//
+// The JSON file typically contains IP ranges in this format:
+//
+//	{
+//	  "addresses": ["23.235.32.0/20", "43.249.72.0/22", ...],
+//	  "ipv6_addresses": ["2a04:4e40::/32", "2a04:4e42::/32", ...]
+//	}
 package fastlyxff
 
 import (
@@ -9,15 +33,29 @@ import (
 	"github.com/labstack/echo/v4"
 )
 
+// FastlyXFF represents Fastly's published IP ranges for their CDN edge servers.
+// This structure matches the JSON format provided by Fastly for their public IP ranges.
+// It contains separate lists for IPv4 and IPv6 CIDR ranges.
 type FastlyXFF struct {
-	IPv4 []string `json:"addresses"`
+	IPv4 []string `json:"addresses"`      // IPv4 CIDR ranges (e.g., "23.235.32.0/20")
-	IPv6 []string `json:"ipv6_addresses"`
+	IPv6 []string `json:"ipv6_addresses"` // IPv6 CIDR ranges (e.g., "2a04:4e40::/32")
 }
 
+// TrustedNets holds parsed network prefixes for efficient IP range checking.
+// This type is currently unused but reserved for future optimizations
+// where frequent IP range lookups might benefit from pre-parsed prefixes.
 type TrustedNets struct {
-	prefixes []netip.Prefix
+	prefixes []netip.Prefix // Parsed network prefixes for efficient lookups
 }
 
+// New loads and parses Fastly IP ranges from a JSON file.
+// The file should contain Fastly's published IP ranges in their standard JSON format.
+//
+// Parameters:
+//   - fileName: Path to the Fastly IP ranges JSON file
+//
+// Returns the parsed FastlyXFF structure or an error if the file cannot be
+// read or the JSON format is invalid.
 func New(fileName string) (*FastlyXFF, error) {
 	b, err := os.ReadFile(fileName)
 	if err != nil {
@@ -34,6 +72,19 @@ func New(fileName string) (*FastlyXFF, error) {
 	return &d, nil
 }
 
+// EchoTrustOption converts Fastly IP ranges into Echo framework trust options.
+// This method generates trust configurations that tell Echo to accept X-Forwarded-For
+// headers only from Fastly's edge servers, ensuring accurate client IP extraction.
+//
+// The generated trust options should be used with Echo's IP extractor:
+//
+//	options, err := fastlyRanges.EchoTrustOption()
+//	if err != nil {
+//		return err
+//	}
+//	e.IPExtractor = echo.ExtractIPFromXFFHeader(options...)
+//
+// Returns a slice of Echo trust options or an error if any CIDR range cannot be parsed.
 func (xff *FastlyXFF) EchoTrustOption() ([]echo.TrustOption, error) {
 	ranges := []echo.TrustOption{}
 

xff/fastlyxff/xff_test.go

@@ -3,14 +3,12 @@ package fastlyxff
 import "testing"
 
 func TestFastlyIPRanges(t *testing.T) {
-
 	fastlyxff, err := New("fastly.json")
 	if err != nil {
 		t.Fatalf("could not load test data: %s", err)
 	}
 
 	data, err := fastlyxff.EchoTrustOption()
-
 	if err != nil {
 		t.Fatalf("could not parse test data: %s", err)
 	}
@@ -19,5 +17,4 @@ func TestFastlyIPRanges(t *testing.T) {
 		t.Logf("only got %d prefixes, expected more", len(data))
 		t.Fail()
 	}
-
 }