Noisy neighbor disk latency
Your read-heavy Postgres replica that powers a customer dashboard starts showing periodic 3-5 second query stalls, but only in 10-minute bursts a few times a day, and never reproduces in staging. Your own QPS, connection count, buffer cache hit ratio, and query plans are all unchanged. The instance is a shared-tenant managed DB. During the stalls, you see disk read latency spike to 40ms (normally 1ms) and 'IO wait' climb, while your logical read volume is flat. There was no deploy on your side. How do you triage and what's your mitigation path?
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 35 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.