Twice a year, on two predictable Sundays, some scheduled jobs skip and others fire twice. Diagnose without waiting for autumn.

Wall-clock schedules meet daylight-saving transitions: spring forward deletes an hour of cron targets, fall back repeats one. Schedule in UTC, add idempotency keys, rehearse in staging.

Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

Wall-clock schedules meet daylight-saving transitions: spring forward deletes an hour of cron targets, fall back repeats one. Schedule in UTC, add idempotency keys, rehearse in staging.

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Next in this trackA node cannot fork new processes at all, and the culprit pod holds ninety thousand threads. Walk me through this failure.Next in this trackSomeone's load test is hitting production checkout right now and latency is climbing. Give me your first fifteen minutes.Next in this trackTime to first token has tripled on your inference service. Nothing deployed. Walk me through the triage.

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