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Two users hit the same bug at once, and I can't tell whose logs are whose.
What you'll have at the end
A request ID that shows up on every log line the request touches, end to end
You need
A running Python web service, built on a framework with request-scoped middleware, whose log lines already come out as one JSON object each instead of scattered print output.
Not covered
Full distributed tracing with spans, parent-child timing, or a tracing backend: this recipe gives every log line and outbound call the same opaque id, not a breakdown of which hop took how long.
Replace print debugging with structured JSON logs
Start there first if your log lines aren't already one JSON object each: this recipe adds one more field to a shape that needs to already exist.
Add distributed tracing so a slow request explains itself
Go there instead when the real question is which hop of a slow request cost the time, not whose log lines belong to whom: that needs real spans, not one shared id.
Checked 19 Aug 2026
Part of the Backend Observability and Monitoring cookbook