GitHub Copilot change history: Elevated errors on Fable 5 due to upstream provider

GitHub Copilot reported a major degradation affecting Claude Fable 5, with elevated errors and requests failing mid-response; no other models were impacted. The incident started at 2026-08-24 07:12 UTC and was resolved at 2026-08-24 07:58 UTC, lasting 46 min. An upstream provider issue caused the disruption, and the provider applied a mitigation.