Question: Support for Otel Metrics

[romerod]

Thanks for this great project.

I wanted to ask whether OpenTelemetry Metrics are also supported or whether you have planned to add support for them?

[zanio]

It would be great to a support for metrics and logs as well

[devurandom]

Something was started in this regard a year ago: #128

and logs as well

Log support is tracked in #142.

[golightlyb]

I can't get any metrics to show up. Here's what I have so far. What am I doing wrong? Thanks

// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0

package main

import (
	"context"
	"log"
	"time"

	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp"
	"go.opentelemetry.io/otel/sdk/metric"
	"go.opentelemetry.io/otel/sdk/resource"
	semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
)

func main() {
	ctx := context.Background()
	exp, err := otlpmetrichttp.New(ctx,
		otlpmetrichttp.WithEndpoint("localhost:4318"),
		otlpmetrichttp.WithInsecure(),
	)
	if err != nil {
		panic(err)
	}

	res, err := resource.New(ctx,
		resource.WithSchemaURL(semconv.SchemaURL),
		resource.WithAttributes(
			semconv.ServiceName("runtime-instrumentation-example"),
		),
	)

	if err != nil {
		log.Fatalf("failed to initialize resource: %e", err)
	}

	meterProvider := metric.NewMeterProvider(
		metric.WithResource(res),
		metric.WithReader(
			metric.NewPeriodicReader(exp, metric.WithInterval(1*time.Second)),
		),
	)
	defer func() {
		if err := meterProvider.Shutdown(ctx); err != nil {
			panic(err)
		}
	}()

	m := meterProvider.Meter("mymeter")
	counter, err := m.Int64Counter("counter")
	if err != nil {
		panic(err)
	}

	otel.SetMeterProvider(meterProvider)

	f := func() {
		for {
			counter.Add(ctx, 1)
			time.Sleep(200 * time.Millisecond)
			// meterProvider.ForceFlush(ctx) // shouldn't need
		}
	}
	go f()

	<-ctx.Done()
}