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metrics.go
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/
metrics.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package tracing
import (
"context"
"fmt"
sync "sync"
"time"
"go.opentelemetry.io/otel/exporters/prometheus"
"go.opentelemetry.io/otel/sdk/metric"
)
var (
mu sync.Mutex
meterProvider *metric.MeterProvider
)
func ProvideMeterProvider(ctx context.Context, _ *NoArgs, deps ExtensionDeps) (*metric.MeterProvider, error) {
mu.Lock()
existing := meterProvider
mu.Unlock()
if existing != nil {
return existing, nil
}
res, err := CreateResource(ctx, deps.ServerInfo, consumeDetectors())
if err != nil {
return nil, fmt.Errorf("failed to create resource: %w", err)
}
prom, err := prometheus.New()
if err != nil {
return nil, err
}
opts := []metric.Option{metric.WithResource(res), metric.WithReader(prom)}
exports := consumeMetricsExporters()
if len(exports) == 0 {
opts = append(opts, metric.WithReader(metric.NewManualReader()))
} else {
for _, exporter := range exports {
opts = append(opts, metric.WithReader(metric.NewPeriodicReader(exporter, metric.WithInterval(10*time.Second))))
}
}
p := metric.NewMeterProvider(opts...)
mu.Lock()
meterProvider = p
mu.Unlock()
return p, nil
}