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metrics.go
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/
metrics.go
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package api
import (
"context"
"fmt"
"log"
"os"
promClient "github.com/prometheus/client_golang/prometheus"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
"go.opentelemetry.io/otel/exporters/prometheus"
"go.opentelemetry.io/otel/propagation"
"go.opentelemetry.io/otel/sdk/metric"
"go.opentelemetry.io/otel/sdk/resource"
sdktrace "go.opentelemetry.io/otel/sdk/trace"
semconv "go.opentelemetry.io/otel/semconv/v1.24.0"
)
func newResource() (*resource.Resource, error) {
return resource.Merge(resource.Default(),
resource.NewWithAttributes(semconv.SchemaURL,
semconv.ServiceName("api"),
semconv.ServiceVersion("0.1.0"),
))
}
func newMeterProvider(ctx context.Context) (*metric.MeterProvider, promClient.Gatherer, error) {
res, err := newResource()
if err != nil {
return nil, nil, fmt.Errorf("creating resource: %w", err)
}
reg := promClient.NewRegistry()
metricExporter, err := prometheus.New(
prometheus.WithRegisterer(reg),
)
if err != nil {
return nil, nil, fmt.Errorf("creating prometheus exporter: %w", err)
}
meterProvider := metric.NewMeterProvider(
metric.WithResource(res),
metric.WithReader(metricExporter),
)
otel.SetMeterProvider(meterProvider)
// Only create a trace provider if the environment variable is set
if _, ok := os.LookupEnv("OTEL_EXPORTER_OTLP_ENDPOINT"); ok {
client := otlptracegrpc.NewClient()
exp, err := otlptrace.New(ctx, client)
if err != nil {
log.Fatalf("failed to initialize exporter: %e", err)
}
tp := sdktrace.NewTracerProvider(
sdktrace.WithBatcher(exp),
sdktrace.WithResource(
resource.NewWithAttributes(
semconv.SchemaURL,
semconv.ServiceNameKey.String("api"),
semconv.ServiceNamespace("nais.io"),
)),
)
otel.SetTracerProvider(tp)
}
tc := propagation.TraceContext{}
// Register the TraceContext propagator globally.
otel.SetTextMapPropagator(tc)
return meterProvider, reg, nil
}