EU - Disruption with some GitHub services
Incident
Report for GitHub Enterprise Cloud - EU
Resolved
On August 27, 2025 between 20:35 and 21:17 UTC, Copilot, Web and REST API traffic experienced degraded performance. Copilot saw an average of 36% of requests fail with a peak failure rate of 77%. Approximately 2% of all non-Copilot Web and REST API traffic requests failed.
This incident occurred after a stale schema cache was used following a database migration. This led to a large number of failed queries. At 21:15 UTC, we applied a fix and by 21:17 UTC, all services had fully recovered.
We have implemented a block for this failure mode as an immediate solution and are actively working to add safeguards to prevent similar issues from occurring in the future.
This incident occurred after a stale schema cache was used following a database migration. This led to a large number of failed queries. At 21:15 UTC, we applied a fix and by 21:17 UTC, all services had fully recovered.
We have implemented a block for this failure mode as an immediate solution and are actively working to add safeguards to prevent similar issues from occurring in the future.
Update
API Requests and Issues are operating normally.
Update
We've discovered the cause of the service disruption and applied a mitigation.
Update
API Requests and Issues are experiencing degraded performance. We are continuing to investigate.
Update
The team is aware of the root cause of this issue and is working to mitigate the issue quickly.
Update
API Requests is experiencing degraded availability. We are continuing to investigate.
Investigating
We are currently investigating this issue.
This incident affected: API Requests and Issues.
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