Cache failover clears hot data
Your read path is cache (Redis) in front of a database, ~95% hit rate normally. At 21:00 the managed Redis has a brief blip — it's only unreachable for 8 seconds — but it comes back EMPTY (the failover cleared it). For the next several minutes your database is melting: DB CPU 100%, connection pool exhausted, query latency 10x, app error rate 35%. Redis itself is now healthy and reachable; it's just cold. No deploy. The 8-second blip ended minutes ago. How do you triage and mitigate?
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.
0:00 of about 40 min
Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.
Run or narrate your approach, then ask the coach.