GitHub Availability Report: January 2021

In January, GitHub experienced a significant incident affecting the availability of its Actions service due to an infrastructure error in the SQL database layer, which lasted nearly four hours on January 28. This issue caused the delay or failure of some queued jobs and was traced back to a core microservice responsible for authentication and communication, which was not adequately recognized by automated processes due to an unrecognized failure pattern and insufficient telemetry. To prevent similar occurrences, GitHub is enhancing its SQL database layer's automation processes for better error detection and failovers, as well as investing in strategies to localize failures and minimize their impact. The company commits to ongoing updates on efforts to ensure service reliability and encourages readers to explore their engineering blog for more insights into system improvements.

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