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metrics.go
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/
metrics.go
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package metrics
import (
"context"
"net/http"
"github.com/alexfalkowski/go-service/env"
"github.com/alexfalkowski/go-service/os"
shttp "github.com/alexfalkowski/go-service/transport/http"
"github.com/alexfalkowski/go-service/version"
"github.com/prometheus/client_golang/prometheus/promhttp"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/exporters/prometheus"
m "go.opentelemetry.io/otel/metric"
"go.opentelemetry.io/otel/sdk/metric"
semconv "go.opentelemetry.io/otel/semconv/v1.21.0"
"go.uber.org/fx"
)
// Register metrics.
func Register(server *shttp.Server) error {
handler := promhttp.Handler()
return server.Mux.HandlePath("GET", "/metrics", func(w http.ResponseWriter, r *http.Request, p map[string]string) {
handler.ServeHTTP(w, r)
})
}
// NewMeter with otel.
func NewMeter(fc fx.Lifecycle, env env.Environment, ver version.Version) (m.Meter, error) {
exporter, err := prometheus.New(prometheus.WithoutTargetInfo())
if err != nil {
return nil, err
}
provider := metric.NewMeterProvider(metric.WithReader(exporter))
name := os.ExecutableName()
attrs := []attribute.KeyValue{
semconv.ServiceName(name),
semconv.ServiceVersion(string(ver)),
semconv.DeploymentEnvironment(string(env)),
}
meter := provider.Meter(os.ExecutableName(), m.WithInstrumentationVersion(string(ver)), m.WithInstrumentationAttributes(attrs...))
fc.Append(fx.Hook{
OnStart: func(ctx context.Context) error {
return provider.ForceFlush(ctx)
},
OnStop: func(ctx context.Context) error {
return provider.Shutdown(ctx)
},
})
return meter, nil
}