Add BearerTokenFunc to support dynamic bearer token authentication
for OTLP gRPC exporters. Tokens are injected via gRPC PerRPCCredentials
on each export request.
- Add BearerTokenFunc type and Config field in tracerconfig
- Implement bearerCredentials (gRPC) and bearerRoundTripper (HTTP)
- Wire bearer auth into all three gRPC exporter creation functions
- Add token verification before flushing buffered logs
- Fix race condition in buffering exporter initialization
Note: HTTP exporters don't support dynamic bearer tokens due to
OpenTelemetry SDK limitations (no WithHTTPClient option). Use gRPC
protocol for dynamic tokens.
- Create new metrics/ package for OpenTelemetry-native metrics with OTLP export
- Refactor OTLP configuration to internal/tracerconfig/ to eliminate code duplication
- Add consistent retry configuration across all HTTP OTLP exporters
- Add configuration validation and improved error messages
- Include test coverage for all new functionality
- Make OpenTelemetry metrics dependencies explicit in go.mod
Designed for new applications requiring structured metrics export to
observability backends via OTLP protocol.
Add buffering exporter to queue OTLP logs until tracing is configured.
Support TLS configuration for OpenTelemetry log export with client
certificate authentication. Improve logfmt formatting and tracing setup.
