Contentful change history: Issues with advanced caching on Content Delivery API

Contentful reported major issues with advanced caching, specifically Stale While Revalidate (SWR), affecting Content Delivery API and EU data residency - Content Delivery API. The incident started 2026-10-01 09:27 UTC and resolved 2026-10-02 09:43 UTC, lasting 24 h 15 min. A fix resolved the issue for remaining customers after most had already recovered.