Duplicate Notifications

Incident Report for CircleCI

Resolved

Between Dec 1, 2025 20:55 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.

Posted Dec 02, 2025 - 02:00 UTC