Vercel change history: Delays in Drains, Observability, and Workflow in Washington (iad1)

Vercel reported a major degradation in Washington (iad1), delaying Drains delivery, logs, metrics, and traces, and leaving Workflow runs pending. It started at 2026-10-10 00:15 UTC and resolved at 2026-10-10 01:37 UTC, lasting 1 h 21 min. A fix restored delivery; delayed data and Build logs were processed, and all services recovered.