Glossary term
What is correlation ID? Meaning for developers
In Backend in Depth
A unique ID for each request. It goes on every log line and every call to other services, so you can follow one request from start to end.
Learn it properly · Backend in DepthLesson 5: Logging and Observability: Structured Logs, Correlation IDs, MetricsJSON logs, log levels, request IDs that follow a request through every service, and what you must never log.In Observability & SRE
A unique id given to a request at the door and put on every log line for it, in every service.
Learn it properly · Observability & SRELesson 1: Logging That Helps: Structured Logs, Levels and Correlation IDsStructured JSON logs, levels, what to log and not log, correlation IDs across services, and sampling.