/
main.go
64 lines (52 loc) · 1.25 KB
/
main.go
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package main
import (
"context"
"fmt"
"log"
"math/rand"
"net/http"
"time"
"github.com/prometheus/client_golang/prometheus/promhttp"
runtimemetrics "go.opentelemetry.io/contrib/instrumentation/runtime"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/prometheus"
"go.opentelemetry.io/otel/metric"
sdkmetric "go.opentelemetry.io/otel/sdk/metric"
)
func main() {
ctx := context.Background()
configureOpentelemetry()
meter := otel.GetMeterProvider().Meter("example")
counter, err := meter.Int64Counter(
"test.my_counter",
metric.WithDescription("Just a test counter"),
)
if err != nil {
panic(err)
}
for {
n := rand.Intn(1000)
time.Sleep(time.Duration(n) * time.Millisecond)
counter.Add(ctx, 1)
}
}
func configureOpentelemetry() {
if err := runtimemetrics.Start(); err != nil {
panic(err)
}
_ = configureMetrics()
http.Handle("/metrics", promhttp.Handler())
fmt.Println("listenening on http://localhost:8088/metrics")
go func() {
_ = http.ListenAndServe(":8088", nil)
}()
}
func configureMetrics() *prometheus.Exporter {
exporter, err := prometheus.New()
if err != nil {
log.Fatal(err)
}
provider := sdkmetric.NewMeterProvider(sdkmetric.WithReader(exporter))
otel.SetMeterProvider(provider)
return exporter
}