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System Observability: Logging, Metrics & Tracing (ELK + OpenTelemetry) · Lesson

Signals and Semantic Conventions

Learn the three OpenTelemetry signals, how they share resources and context, and why semantic conventions make telemetry portable across tools.

The Three Signals

OpenTelemetry defines three signals of telemetry: traces, metrics, and logs. One specification and SDK produce all three in a consistent way.

Traces

Traces capture the path of a request across services as a tree of spans, answering where time went and what failed.

span: GET /checkout
  span: query inventory
  span: charge payment

All lessons in this course

  1. The OpenTelemetry Standard
  2. OTel Collectors and Exporters
  3. Instrumenting Apps with OTel SDKs
  4. Signals and Semantic Conventions
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