On-callHardoc-p086

Subject Incident responseLevel Senior~20 minCommon in Reliability & on-call interviewsIndustries Technology, Software development

Question

A streaming consumer group reset to the beginning of the log (offset 0) and is reprocessing weeks of events — re-sending emails, re-charging, or re-applying updates. How do you respond?

What a strong answer looks like

Stop the bleeding first (mitigate), then form hypotheses from real signals. Separate root cause from symptom, communicate status as you go, and close with what prevents a repeat.

Learn the concepts

Diagram & narrate the incident

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Run or narrate your approach, then ask the coach.