Start here. This is the direct spoken answer to practice first.
Why this question matters
Handle a production support case where logs exist but related request events cannot be connected. It matters in real backend work because the team needs observability, ownership, and rollback room to recover without guessing. The practical angle is incident triage, logging gaps, observability remediation, safe diagnostics, and support workflows, tied to a concrete production decision.
Immediately, I would narrow the incident using what still exists: timestamp, endpoint, status code, user or tenant if safe, deployment version, and dependency logs. I would avoid guessing from one log line. If the issue is active, I would reproduce it and capture a clean trace. Then I would add correlation ID handling so the next incident is traceable.