Что такое OpenTelemetry
Коротко:
OpenTelemetry (OTel) — CNCF-graduated vendor-neutral standard и tooling для collection + export observability data. Combines OpenTracing + OpenCensus (слияние 2019). Support: metrics, logs, traces через single SDK для 15+ languages. Auto-instrumentation для popular frameworks (Express, FastAPI, Django, Spring). Export в любой backend: Jaeger, Prometheus, Datadog, New Relic, Grafana Tempo.
Ниже: подробности, пример, смежные термины, FAQ.
Подробности
- SDK (в app): generates spans, metrics
- Collector: receives from SDK, processes (sampling, filtering), exports
- Exporters: Jaeger, Prometheus, OTLP (open protocol), vendor-specific
- Auto-instrumentation: drop-in для Express, Flask, Django, FastAPI, Spring, Rails
- Context propagation: trace_id через HTTP headers (W3C Trace Context)
Пример
// Node.js Express auto-instrumentation
const { NodeSDK } = require('@opentelemetry/sdk-node');
const { getNodeAutoInstrumentations } = require('@opentelemetry/auto-instrumentations-node');
const sdk = new NodeSDK({
instrumentations: [getNodeAutoInstrumentations()],
});
sdk.start(); // Now all Express routes auto-tracedСмежные термины
Больше по теме
Часто задаваемые вопросы
OpenTelemetry vs Datadog agent?
OTel — open standard, vendor-neutral. Datadog agent — vendor-specific, более deep integrations. OTel migration easier if switch vendors.
Производительность overhead?
2-5% CPU overhead с auto-instrumentation. Sampling (1-10% traces) снижает.
Stable release?
Tracing — stable с 2021. Metrics — stable с 2023. Logs — stable с 2024. All three usable в prod.