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Aaron Clawson
b6a22abab7
This change will automatically register a created exporter with a prometheus registerer, if none are provided it will use prometheus' DefaultRegisterer. Co-authored-by: Chester Cheung <cheung.zhy.csu@gmail.com>
91 lines
2.6 KiB
Go
91 lines
2.6 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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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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"net/http"
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"os"
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"os/signal"
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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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"go.opentelemetry.io/otel/metric/instrument"
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"go.opentelemetry.io/otel/sdk/metric"
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)
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func main() {
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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("github.com/open-telemetry/opentelemetry-go/example/prometheus")
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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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attrs := []attribute.KeyValue{
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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.SyncFloat64().Counter("foo", instrument.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, attrs...)
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gauge, err := meter.SyncFloat64().UpDownCounter("bar", instrument.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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gauge.Add(ctx, 100, attrs...)
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gauge.Add(ctx, -25, attrs...)
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// This is the equivalent of prometheus.NewHistogramVec
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histogram, err := meter.SyncFloat64().Histogram("baz", instrument.WithDescription("a very nice histogram"))
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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, 23, attrs...)
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histogram.Record(ctx, 7, attrs...)
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histogram.Record(ctx, 101, attrs...)
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histogram.Record(ctx, 105, attrs...)
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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)
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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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