GitHub Availability Report: November 2020

In November, GitHub experienced two significant incidents affecting their services, primarily issues, pull requests, and GitHub Actions. On November 2nd, an expired SSL certificate for *.githubassets.com caused disruptions for 32 minutes, highlighting a gap in the automated alerts system that was not addressed in time. The incident prompted a reevaluation of processes and automation to prevent future occurrences. Later, on November 27th, replication lag in a MySQL cluster led to an hour-long service disruption affecting GitHub Actions, with investigations into the root cause still ongoing. GitHub emphasizes its commitment to service reliability and user trust and plans to provide further updates on their engineering blog.