next-ai-draw-io/instrumentation.ts

import { LangfuseSpanProcessor } from '@langfuse/otel';
import { NodeTracerProvider } from '@opentelemetry/sdk-trace-node';

export function register() {
  // Skip telemetry if Langfuse env vars are not configured
  if (!process.env.LANGFUSE_PUBLIC_KEY || !process.env.LANGFUSE_SECRET_KEY) {
    console.warn('[Langfuse] Environment variables not configured - telemetry disabled');
    return;
  }

  const langfuseSpanProcessor = new LangfuseSpanProcessor({
    publicKey: process.env.LANGFUSE_PUBLIC_KEY,
    secretKey: process.env.LANGFUSE_SECRET_KEY,
    baseUrl: process.env.LANGFUSE_BASEURL,
  });

  const tracerProvider = new NodeTracerProvider({
    spanProcessors: [langfuseSpanProcessor],
  });

  tracerProvider.register();
}