GitHub Availability Report: September 2022

In September, GitHub experienced a significant incident affecting multiple services, particularly impacting Enterprise Managed Users due to a data transition error that removed necessary data for pull request merges, which was resolved by restoring data from a backup. Additionally, a Codespaces incident occurred on September 28, but the investigation is ongoing, with a detailed report expected in October. A previous Codespaces issue from August 29 was traced to an Ubuntu security patch affecting DNS resolution, which was mitigated by disabling systemd's DNS resolver. An August 18 incident involved a spike in traffic to GitHub Actions, overloading a token database, which was resolved by scaling up the database and adjusting concurrent connections. GitHub is making procedural improvements to enhance the reliability of its services, including data transition processes, DNS configurations, and monitoring and alerting systems.

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