Add png graph handler

go.mod

@@ -7,12 +7,16 @@ go 1.21.3
 require (
 	github.com/ClickHouse/clickhouse-go/v2 v2.16.0
 	github.com/go-sql-driver/mysql v1.7.1
+	github.com/hashicorp/go-retryablehttp v0.7.5
 	github.com/labstack/echo/v4 v4.11.3
 	github.com/samber/slog-echo v1.9.0
 	github.com/spf13/cobra v1.8.0
 	github.com/stretchr/testify v1.8.4
+	go.ntppool.org/api v0.1.8-0.20231210025001-f2c143296511
 	go.ntppool.org/common v0.2.5
 	go.opentelemetry.io/contrib/instrumentation/github.com/labstack/echo/otelecho v0.46.1
+	go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace v0.46.1
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.46.1
 	go.opentelemetry.io/otel v1.21.0
 	go.opentelemetry.io/otel/trace v1.21.0
 	golang.org/x/sync v0.5.0
@@ -26,6 +30,7 @@ require (
 	github.com/cenkalti/backoff/v4 v4.2.1 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/go-faster/city v1.0.1 // indirect
 	github.com/go-faster/errors v0.7.0 // indirect
 	github.com/go-logr/logr v1.3.0 // indirect
@@ -34,6 +39,7 @@ require (
 	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/google/uuid v1.4.0 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.18.1 // indirect
+	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/klauspost/compress v1.17.4 // indirect
 	github.com/labstack/gommon v0.4.1 // indirect
@@ -41,7 +47,7 @@ require (
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/matttproud/golang_protobuf_extensions/v2 v2.0.0 // indirect
 	github.com/paulmach/orb v0.10.0 // indirect
-	github.com/pierrec/lz4/v4 v4.1.18 // indirect
+	github.com/pierrec/lz4/v4 v4.1.19 // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/prometheus/client_golang v1.17.0 // indirect