Upstash change history: Fly.io Upstash Redis service distruption (FRA region)

Upstash reported a major degradation affecting some Fly.io Redis databases in FRA, with increased latency or timeouts. It started at 2026-05-11 15:05 UTC and resolved at 2026-05-11 18:22 UTC, lasting 3 h 16 min. The postmortem described Redis processes stalling inside a logging syscall; the supplied root-cause explanation is truncated.