Sample Answer
At a fintech startup I inherited alerts showing CPU spikes and 5xx rates every weekday morning that impacted ~20k users. I dug into logs and correlated traces to find a batch job that ran synchronously during business hours and caused DB connection pool exhaustion. I prioritized it because it affected revenue-generating flows and recovery time was long. I split the batch into smaller chunks, added circuit breakers, and moved non-critical parts to an off-peak scheduler. I also added real-time dashboards and an automated rollback for the job. Over four weeks we cut peak 5xxs from 3.8% to 0.2%, reduced mean time to recovery from 45m to 7m, and eliminated the recurring spike.
Keywords
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