Circle CI incident

Duplicate Notifications

Resolved on December 2, 2025.

resolved Dec 03, 2025, 04:01 PM UTC

Between Dec 2, 2025 16:20 UTC and Dec 3, 2025 14:27 UTC, a change deployed to our workflow execution system caused duplicate notifications to be sent to some customers and triggered unexpected auto-reruns for a small number of projects. Impact: - Some customers received multiple failure notification emails for the same workflow. - The number of duplicate notifications varied based on how many jobs in the workflow were affected (e.g., marked skipped or cancelled). - A subset of customers may have received duplicate Slack notifications. - A small number of projects experienced duplicated auto-reruns. The issue has been fully mitigated, and notification behavior has returned to normal. We appreciate your patience while our team resolved this issue.

Started
Dec 02, 2025, 02:00 AM UTC
Resolved
Dec 02, 2025, 02:00 AM UTC
Duration
–
Detected by Pingoru
Dec 02, 2025, 02:00 AM UTC

Update timeline

  1. resolved Dec 03, 2025, 04:01 PM UTC

    Between Dec 2, 2025 16:20 UTC and Dec 3, 2025 14:27 UTC, a change deployed to our workflow execution system caused duplicate notifications to be sent to some customers and triggered unexpected auto-reruns for a small number of projects. Impact: - Some customers received multiple failure notification emails for the same workflow. - The number of duplicate notifications varied based on how many jobs in the workflow were affected (e.g., marked skipped or cancelled). - A subset of customers may have received duplicate Slack notifications. - A small number of projects experienced duplicated auto-reruns. The issue has been fully mitigated, and notification behavior has returned to normal. We appreciate your patience while our team resolved this issue.

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