In March, we experienced two incidents that resulted in degraded performance across GitHub services.
March 15 19:42 UTC (lasting 42 minutes)
On March 15, GitHub experienced service degradation from 19:42 to 20:24 UTC due to a regression in the permissions system. This regression caused failures in GitHub Codespaces, GitHub Actions, and GitHub Pages. The problem stemmed from a framework upgrade that introduced MySQL query syntax that is incompatible with the database proxy service used in some production clusters. GitHub responded by rolling back the deployment and fixing a misconfiguration in development and CI environments to prevent similar issues in the future.
March 11 22:45 UTC (lasting 2 hours and 3 minutes)
On March 11, GitHub experienced service degradation from 22:45 to 00:48 UTC due to an inadvertent deployment of network configuration to the wrong environment. This led to intermittent errors in various services, including API requests, GitHub Copilot, GitHub secret scanning, and 2FA using GitHub Mobile. The issue was detected within 4 minutes, and a rollback was initiated immediately. The majority of impact was mitigated by 22:54 UTC. However, the rollback failed in one data center due to system-created configuration records missing a required field, causing 0.4% of requests to continue failing. Full rollback was successful after manual intervention to correct the configuration data, enabling full service restoration by 00:48 UTC. GitHub has implemented measures for safer configuration changes, such as prevention and automatic cleanup of obsolete configuration and faster issue detection, to prevent similar issues in the future.
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