Prometheus metrics jaeger

tracer.go

package tracer

import (
	"io"

	opentracing "github.com/opentracing/opentracing-go"
	"github.com/prometheus/client_golang/prometheus"
	jaegercfg "github.com/uber/jaeger-client-go/config"
	"github.com/uber/jaeger-client-go/rpcmetrics"
	jprom "github.com/uber/jaeger-lib/metrics/prometheus"
)

func New(registry prometheus.Registerer) (opentracing.Tracer, io.Closer, error) {
	cfg, err := jaegercfg.FromEnv()
	if err != nil {
		return nil, nil, err
	}

	metrics := jprom.New(jprom.WithRegisterer(registry)).Namespace("my_service_tracing", nil)

	return cfg.New("my-service",
		jaegercfg.Metrics(metrics),
		jaegercfg.Observer(rpcmetrics.NewObserver(metrics, rpcmetrics.DefaultNameNormalizer)),
	)
}