Buildkite change history: Buildkite service disruption

Buildkite reported a major site-wide outage starting 2026-08-25 22:55 UTC, resolved 2026-08-26 00:18 UTC (1 h 22 min). Internal DNS failure blocked new builds and delayed job dispatch; web, APIs and notifications were affected. Mitigations restored service; no build requests were lost. The postmortem places customer disruption at 22:47 UTC to 23:16 UTC.