mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2024-12-30 21:20:04 +02:00
f5b4e99025
Part of #5412 - Use the recommended package name for the instrumentation exemplified in the repository. - Use the recommended detection of a `TracerProvider` from passed context.
95 lines
2.4 KiB
Go
95 lines
2.4 KiB
Go
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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package main
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import (
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"context"
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"fmt"
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"log"
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"math/rand"
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"net/http"
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"os"
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"os/signal"
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"time"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/exporters/prometheus"
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api "go.opentelemetry.io/otel/metric"
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"go.opentelemetry.io/otel/sdk/metric"
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)
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const meterName = "go.opentelemetry.io/otel/example/prometheus"
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func main() {
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rng := rand.New(rand.NewSource(time.Now().UnixNano()))
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ctx := context.Background()
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// The exporter embeds a default OpenTelemetry Reader and
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// implements prometheus.Collector, allowing it to be used as
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// both a Reader and Collector.
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exporter, err := prometheus.New()
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if err != nil {
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log.Fatal(err)
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}
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provider := metric.NewMeterProvider(metric.WithReader(exporter))
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meter := provider.Meter(meterName)
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// Start the prometheus HTTP server and pass the exporter Collector to it
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go serveMetrics()
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opt := api.WithAttributes(
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attribute.Key("A").String("B"),
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attribute.Key("C").String("D"),
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)
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// This is the equivalent of prometheus.NewCounterVec
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counter, err := meter.Float64Counter("foo", api.WithDescription("a simple counter"))
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if err != nil {
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log.Fatal(err)
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}
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counter.Add(ctx, 5, opt)
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gauge, err := meter.Float64ObservableGauge("bar", api.WithDescription("a fun little gauge"))
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if err != nil {
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log.Fatal(err)
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}
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_, err = meter.RegisterCallback(func(_ context.Context, o api.Observer) error {
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n := -10. + rng.Float64()*(90.) // [-10, 100)
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o.ObserveFloat64(gauge, n, opt)
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return nil
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}, gauge)
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if err != nil {
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log.Fatal(err)
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}
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// This is the equivalent of prometheus.NewHistogramVec
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histogram, err := meter.Float64Histogram(
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"baz",
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api.WithDescription("a histogram with custom buckets and rename"),
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api.WithExplicitBucketBoundaries(64, 128, 256, 512, 1024, 2048, 4096),
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)
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if err != nil {
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log.Fatal(err)
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}
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histogram.Record(ctx, 136, opt)
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histogram.Record(ctx, 64, opt)
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histogram.Record(ctx, 701, opt)
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histogram.Record(ctx, 830, opt)
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ctx, _ = signal.NotifyContext(ctx, os.Interrupt)
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<-ctx.Done()
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}
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func serveMetrics() {
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log.Printf("serving metrics at localhost:2223/metrics")
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http.Handle("/metrics", promhttp.Handler())
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err := http.ListenAndServe(":2223", nil) //nolint:gosec // Ignoring G114: Use of net/http serve function that has no support for setting timeouts.
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if err != nil {
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fmt.Printf("error serving http: %v", err)
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return
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}
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}
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