Upstash change history: Fly.io Upstash Redis Service Distruption

A critical Fly.io Upstash Redis degradation caused intermittent hangs and elevated error rates for a subset of instances. It started at 2026-05-12 09:49 UTC and resolved at 2026-05-12 13:48 UTC, lasting 3 h 59 min. Upstash implemented a fix; its postmortem reported Redis processes stalling inside a logging syscall.