Incident with Pull Requests
On September 20, 2026, between 21:46 and 22:24 UTC the Pull Requests service was degraded and pull request merge and test-merge commits were created late, with delays reaching approximately four minutes at peak. Merge commits were delayed rather than lost. Because some Actions workflow runs start only after a pull request's merge commit is created, a subset of workflow runs for pull request events were also delayed. This was due to a routine repository maintenance job for an unusually large repository consuming nearly all of the memory on a single Git storage server, which left that server unable to serve the Git operations used to create merge commits. We mitigated the incident by removing the affected server from service at 22:18 UTC, after which the queued merge commits were created within six minutes. We have capped the memory a single repository maintenance job may consume so that one repository cannot exhaust a server, and we have improved monitoring and alerting on storage serve
The latest update from GitHub.
State
Resolved
Started
41 d ago
2026-09-20 22:13 UTC
Lasted
1 h 9 min
until 2026-09-20 23:22 UTC
Worst impact
Degraded
Timeline
4 updatesInvestigating
14 min 20%
Monitoring
55 min 80%
Updates
Times in UTCAs posted by GitHub
On September 20, 2026, between 21:46 and 22:24 UTC the Pull Requests service was degraded and pull request merge and test-merge commits were created late, with delays reaching approximately four minutes at peak. Merge commits were delayed rather than lost. Because some Actions workflow runs start only after a pull request's merge commit is created, a subset of workflow runs for pull request events were also delayed. This was due to a routine repository maintenance job for an unusually large repository consuming nearly all of the memory on a single Git storage server, which left that server unable to serve the Git operations used to create merge commits. We mitigated the incident by removing the affected server from service at 22:18 UTC, after which the queued merge commits were created within six minutes. We have capped the memory a single repository maintenance job may consume so that one repository cannot exhaust a server, and we have improved monitoring and alerting on storage serve
A git fileserver issue caused a brief delay in creating some merge commits - we've isolated the underlying server and already observed recovery.
The degradation affecting Pull Requests has been mitigated. We are monitoring to ensure stability.
We are investigating reports of degraded performance for Pull Requests
Affected components
1GitHub in the last 90 days
Full historyIncidents in 90 days
46
Days with an incident
34
Median duration
1 h 29 min
This incident
23% shorter than the median
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