Observability

Observability — OpenTelemetry & Distributed Tracing

Instrumentation moderne avec OpenTelemetry pour métriques, traces et logs structurés.

Piliers de l'Observabilité

Pilier	Technologies	Métriques clés
Metrics	Prometheus, Grafana, Datadog	RED (Rate, Errors, Duration), USE (Utilization, Saturation, Errors)
Traces	OpenTelemetry, Jaeger, Tempo	P95 latency, span duration, error rate
Logs	Loki, ElasticSearch, Datadog	Structured JSON, correlation IDs

OpenTelemetry (OTel) Stack

// Node.js — Auto-instrumentation
const { NodeSDK } = require('@opentelemetry/sdk-node');
const { getNodeAutoInstrumentations } = require('@opentelemetry/auto-instrumentations-node');

const sdk = new NodeSDK({
  traceExporter: new OTLPTraceExporter(),
  instrumentations: [getNodeAutoInstrumentations()],
});

sdk.start();