Ably change history: Elevated Attach Error Rate in eu-west-1

Ably reported a major incident involving elevated attachment errors in eu-west-1, affecting Ably Pub/Sub - Europe (Ireland) and Europe (Ireland). It started at 2026-02-14 05:57 UTC and lasted 8 min, resolving at 2026-02-14 06:05 UTC; Ably implemented a fix but did not state a cause.