Sample Answer
When I see latency and 5xx spikes I start by correlating metrics and logs: I open Grafana dashboards tied to Prometheus for request latency percentiles, error rates, and resource metrics (CPU, memory, I/O) across the last 30–60 minutes. I then tail application logs in ELK or CloudWatch to find error patterns and stack traces, focusing on the first error timestamps. For a recent incident impacting ~12% of users, I identified a surge in DB connection wait time and a few downstream timeouts. Immediate mitigations I used were: enable a degraded route (circuit-breaker) to failfast noncritical features, scale the service horizontally by adding 3 replicas (autoscaler rules applied), and increase DB connection pool temporarily. I snapshot logs and metrics, set retention and export for postmortem, and created a brief timeline with root-cause candidates for the on-call rotation.
Keywords
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