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Set up Flask performance monitoring with request metrics and traces. Find slow routes, database calls, and failed exports before users report them.

Monitor FastAPI routes with request metrics and OpenTelemetry traces. Check latency, errors, and downstream work before setting alerts.

Fix dd-trace init order in Node.js with correct CommonJS, ESM, TypeScript, and bundler startup patterns when spans or routes disappear.

Set up Python application performance monitoring with OpenTelemetry. Measure latency, errors, throughput, and dependency spans across production requests.

Set up Node.js application performance monitoring with route latency, event loop metrics, traces, and a clear test for missing coverage.