feat: Move from datadog to generic otel (#1567)

coderd/tracing/exporter.go

@@ -0,0 +1,41 @@
+package tracing
+
+import (
+	"context"
+
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
+	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
+	"go.opentelemetry.io/otel/sdk/resource"
+	sdktrace "go.opentelemetry.io/otel/sdk/trace"
+	semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
+	"golang.org/x/xerrors"
+)
+
+// TracerProvider creates a grpc otlp exporter and configures a trace provider.
+// Caller is responsible for calling TracerProvider.Shutdown to ensure all data is flushed.
+func TracerProvider(ctx context.Context, service string) (*sdktrace.TracerProvider, error) {
+	res, err := resource.New(ctx,
+		resource.WithAttributes(
+			// the service name used to display traces in backends
+			semconv.ServiceNameKey.String(service),
+		),
+	)
+	if err != nil {
+		return nil, xerrors.Errorf("creating otlp resource: %w", err)
+	}
+
+	// By default we send span data to a local otel collector.
+	// The endpoint we push to can be configured with env vars.
+	// See https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/exporter.md
+	exporter, err := otlptrace.New(ctx, otlptracegrpc.NewClient(otlptracegrpc.WithInsecure()))
+	if err != nil {
+		return nil, xerrors.Errorf("creating otlp exporter: %w", err)
+	}
+
+	tracerProvider := sdktrace.NewTracerProvider(
+		sdktrace.WithBatcher(exporter),
+		sdktrace.WithResource(res),
+	)
+
+	return tracerProvider, nil
+}