Amigo's answer
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How to approach it
Show a calm, systematic process: stabilise first, then investigate. Explain how you limit impact, gather evidence, form and test hypotheses and prevent it from happening again.
Example answer
"First I focus on impact — can we roll back or feature-flag the change to stop users being affected? Once things are stable, I check dashboards, logs and recent deploys to narrow down when it started. I form one hypothesis at a time and test it, rather than changing several things at once. After the fix, I write a short blameless postmortem with the root cause and a follow-up action, like a new alert or test, so it doesn't happen again."