GitHub Availability Report: December 2023

In December, GitHub experienced three service degradation incidents linked to a broad secret rotation initiative. The incidents, occurring on December 27, 28, and 29, were due to issues with HMAC secret rotation, failed authentication updates, and credential mismatches respectively, affecting codespace creations, email notifications, and user sign-ins. Each incident prompted immediate mitigation actions and prompted improvements in key rotation playbooks, documentation updates, and monitoring systems to enhance future response and reduce availability risks. GitHub encourages users to follow its status page for real-time updates and consult its Engineering Blog for more insights.