GitHub Availability Report: September 2023

In September, GitHub experienced two significant incidents impacting service performance. The first incident on September 5 involved a 19-minute outage due to a file system write error in a primary database, which disrupted multiple services, including SAML login and GitHub Actions. The automatic failover failed to detect this partial failure, but manual intervention restored services, leading to improvements in failover detection and automation. The second incident on September 19, lasting 7.5 hours, occurred during a data migration for GitHub Projects, where a misconfigured index constraint rendered project data unavailable for 3.5 hours. This incident also caused limited availability of some Git operations. GitHub has since enhanced validation processes for data migrations and is implementing measures to reduce data restoration times and address replication issues.

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