Buildkite change history: macOS hosted agent jobs not starting

Buildkite reported a major outage preventing macOS hosted agent jobs from starting because of a misconfigured agent image update. Recorded start: 2026-09-30 06:30 UTC; recorded resolution: 2026-09-28 01:30 UTC; duration unknown. The vendor reported a fix and normal operation for new jobs; affected jobs still in Scheduled must be canceled and retried.