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main.go
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main.go
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// 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"
"net/http"
"sync"
"time"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/exporters/prometheus"
"go.opentelemetry.io/otel/metric/global"
"go.opentelemetry.io/otel/metric/instrument"
"go.opentelemetry.io/otel/sdk/metric/aggregator/histogram"
controller "go.opentelemetry.io/otel/sdk/metric/controller/basic"
"go.opentelemetry.io/otel/sdk/metric/export/aggregation"
processor "go.opentelemetry.io/otel/sdk/metric/processor/basic"
selector "go.opentelemetry.io/otel/sdk/metric/selector/simple"
)
var (
lemonsKey = attribute.Key("ex.com/lemons")
)
func initMeter() {
config := prometheus.Config{
DefaultHistogramBoundaries: []float64{1, 2, 5, 10, 20, 50},
}
c := controller.New(
processor.NewFactory(
selector.NewWithHistogramDistribution(
histogram.WithExplicitBoundaries(config.DefaultHistogramBoundaries),
),
aggregation.CumulativeTemporalitySelector(),
processor.WithMemory(true),
),
)
exporter, err := prometheus.New(config, c)
if err != nil {
log.Panicf("failed to initialize prometheus exporter %v", err)
}
global.SetMeterProvider(exporter.MeterProvider())
http.HandleFunc("/", exporter.ServeHTTP)
go func() {
_ = http.ListenAndServe(":2222", nil)
}()
fmt.Println("Prometheus server running on :2222")
}
func main() {
initMeter()
meter := global.Meter("ex.com/basic")
observerLock := new(sync.RWMutex)
observerValueToReport := new(float64)
observerLabelsToReport := new([]attribute.KeyValue)
gaugeObserver, err := meter.AsyncFloat64().Gauge("ex.com.one")
if err != nil {
log.Panicf("failed to initialize instrument: %v", err)
}
_ = meter.RegisterCallback([]instrument.Asynchronous{gaugeObserver}, func(ctx context.Context) {
(*observerLock).RLock()
value := *observerValueToReport
labels := *observerLabelsToReport
(*observerLock).RUnlock()
gaugeObserver.Observe(ctx, value, labels...)
})
histogram, err := meter.SyncFloat64().Histogram("ex.com.two")
if err != nil {
log.Panicf("failed to initialize instrument: %v", err)
}
counter, err := meter.SyncFloat64().Counter("ex.com.three")
if err != nil {
log.Panicf("failed to initialize instrument: %v", err)
}
commonLabels := []attribute.KeyValue{lemonsKey.Int(10), attribute.String("A", "1"), attribute.String("B", "2"), attribute.String("C", "3")}
notSoCommonLabels := []attribute.KeyValue{lemonsKey.Int(13)}
ctx := context.Background()
(*observerLock).Lock()
*observerValueToReport = 1.0
*observerLabelsToReport = commonLabels
(*observerLock).Unlock()
histogram.Record(ctx, 2.0, commonLabels...)
counter.Add(ctx, 12.0, commonLabels...)
time.Sleep(5 * time.Second)
(*observerLock).Lock()
*observerValueToReport = 1.0
*observerLabelsToReport = notSoCommonLabels
(*observerLock).Unlock()
histogram.Record(ctx, 2.0, notSoCommonLabels...)
counter.Add(ctx, 22.0, notSoCommonLabels...)
time.Sleep(5 * time.Second)
(*observerLock).Lock()
*observerValueToReport = 13.0
*observerLabelsToReport = commonLabels
(*observerLock).Unlock()
histogram.Record(ctx, 12.0, commonLabels...)
counter.Add(ctx, 13.0, commonLabels...)
fmt.Println("Example finished updating, please visit :2222")
select {}
}