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CircleCI Outage Traced to Scheduled Workflow Deletions Its Earlier Fix Missed

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CircleCI's pipeline and workflow processing stopped for about 12 hours on October 9, 2026, after its Postgres database ran out of disk space. The trigger was a scheduled cleanup of completed Temporal workflow history, not an unexpected load spike. A fix shipped after a near-identical October 6 outage had moved the transaction log to a dedicated volume and reduced write pressure, but it did not account for deletions already scheduled for October 9. Once the log volume filled, Postgres went read-only, and a later failure from bloated cleanup tables and a retry storm caused further slowdowns before the backlog cleared.

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CircleCI Outage Traced to Scheduled Workflow Deletions Its Earlier Fix Missed · ShortSingh