pkg/metrics/exporters/prometheus/prometheus.go

package prometheus

import (
	crprometheus "github.com/prometheus/client_golang/prometheus"
	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/exporters/prometheus"
	"go.opentelemetry.io/otel/sdk/metric"
	"sigs.k8s.io/controller-runtime/pkg/metrics"
)

const (
	// ExporterName is the name of the exporter
	ExporterName = "prometheus"
)

func InitExporter() error {
	exporter, err := prometheus.New(
		prometheus.WithRegisterer(metrics.Registry.(*crprometheus.Registry)),
	)
	if err != nil {
		return err
	}

	meterProvider := metric.NewMeterProvider(
		metric.WithReader(exporter),
		metric.WithView(metric.NewView(
			metric.Instrument{Name: "azwi_*"},
			metric.Stream{
				Aggregation: metric.AggregationExplicitBucketHistogram{
					Boundaries: []float64{0.001, 0.002, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.5, 2, 2.5, 3},
				}},
		)),
	)

	otel.SetMeterProvider(meterProvider)

	return nil
}