mirror of
https://github.com/open-telemetry/opentelemetry-go.git
synced 2024-12-14 10:13:10 +02:00
69b18e62a7
* Update RegisterCallback and Callback declerations RegisterCallback accepts variadic Asynchronous instruments instead of a slice. Callback accepts an observation result recorder to ensure instruments that are observed by a callback. * Update global, noop, SDK implementations * Fix examples * Add changes to changelog * Test RegisterCallback for invalid observers * Test callbacks from foreign sources not collected * Support registering delegating instruments
104 lines
2.8 KiB
Go
104 lines
2.8 KiB
Go
// Copyright The OpenTelemetry Authors
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package main
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"log"
|
|
"math/rand"
|
|
"net/http"
|
|
"os"
|
|
"os/signal"
|
|
"time"
|
|
|
|
"github.com/prometheus/client_golang/prometheus/promhttp"
|
|
|
|
"go.opentelemetry.io/otel/attribute"
|
|
"go.opentelemetry.io/otel/exporters/prometheus"
|
|
api "go.opentelemetry.io/otel/metric"
|
|
"go.opentelemetry.io/otel/metric/instrument"
|
|
"go.opentelemetry.io/otel/sdk/metric"
|
|
)
|
|
|
|
func init() {
|
|
rand.Seed(time.Now().UnixNano())
|
|
}
|
|
|
|
func main() {
|
|
ctx := context.Background()
|
|
|
|
// The exporter embeds a default OpenTelemetry Reader and
|
|
// implements prometheus.Collector, allowing it to be used as
|
|
// both a Reader and Collector.
|
|
exporter, err := prometheus.New()
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
provider := metric.NewMeterProvider(metric.WithReader(exporter))
|
|
meter := provider.Meter("github.com/open-telemetry/opentelemetry-go/example/prometheus")
|
|
|
|
// Start the prometheus HTTP server and pass the exporter Collector to it
|
|
go serveMetrics()
|
|
|
|
attrs := []attribute.KeyValue{
|
|
attribute.Key("A").String("B"),
|
|
attribute.Key("C").String("D"),
|
|
}
|
|
|
|
// This is the equivalent of prometheus.NewCounterVec
|
|
counter, err := meter.Float64Counter("foo", instrument.WithDescription("a simple counter"))
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
counter.Add(ctx, 5, attrs...)
|
|
|
|
gauge, err := meter.Float64ObservableGauge("bar", instrument.WithDescription("a fun little gauge"))
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
_, err = meter.RegisterCallback(func(_ context.Context, o api.Observer) error {
|
|
n := -10. + rand.Float64()*(90.) // [-10, 100)
|
|
o.ObserveFloat64(gauge, n, attrs...)
|
|
return nil
|
|
}, gauge)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
// This is the equivalent of prometheus.NewHistogramVec
|
|
histogram, err := meter.Float64Histogram("baz", instrument.WithDescription("a very nice histogram"))
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
histogram.Record(ctx, 23, attrs...)
|
|
histogram.Record(ctx, 7, attrs...)
|
|
histogram.Record(ctx, 101, attrs...)
|
|
histogram.Record(ctx, 105, attrs...)
|
|
|
|
ctx, _ = signal.NotifyContext(ctx, os.Interrupt)
|
|
<-ctx.Done()
|
|
}
|
|
|
|
func serveMetrics() {
|
|
log.Printf("serving metrics at localhost:2223/metrics")
|
|
http.Handle("/metrics", promhttp.Handler())
|
|
err := http.ListenAndServe(":2223", nil)
|
|
if err != nil {
|
|
fmt.Printf("error serving http: %v", err)
|
|
return
|
|
}
|
|
}
|