GitHub's October Report: Scaling Up Azure While Battling Outages

GitHub published its monthly availability update for October, detailing its ongoing migration to Microsoft Azure's Central US region. The platform has moved a majority of its production services and databases to Azure, significantly scaled its Kubernetes capacity, and handled substantial traffic growth. Specific reliability improvements were implemented, including changes to GitHub Actions and database optimizations that dramatically reduced query loads.

Despite the infrastructure progress, October saw notable service disruptions. A 'write outage' on October 7th stemmed from an unsafe interaction between database orchestration and routing. Later, on October 29th, an Azure network disruption affected all three Central US availability zones, impacting over 34,000 signed-in users. The report concludes that capacity growth must be paired with safer operations and stronger isolation to improve reliability.