Logging, Metrics ve Tracing
Structured logging (pino, bunyan), metrics (Prometheus + client), distributed tracing (OpenTelemetry), correlation id, log aggregation ve alerting. Production debugging ve incident response playbook'ları.
OpenTelemetry örneği (pseudo)
import { trace } from '@opentelemetry/api';
const span = trace.getTracer('app').startSpan('operation');
// ...
span.end();