GitHub Availability Report: December 2025

In December 2025, GitHub experienced five incidents that affected its services, with varying causes and impacts. From November 26 to December 8, a misconfiguration in the AI Controls page disrupted the display of agent session activities, which was resolved by correcting the configuration and enhancing monitoring and validation. On December 15, a service degradation in Copilot Code Review led to nearly half of review requests failing due to latency in an internal dependency, which was mitigated by adjusting configurations and increasing worker capacity. On December 18, GitHub Actions faced intermittent timeouts due to network packet loss, affecting a small percentage of jobs; traffic routing adjustments helped resolve this. The same day, a database schema drift caused issues with updating Copilot policies, addressed by synchronizing the schema and strengthening the service. On December 22, a traffic spike degraded unauthenticated requests to GitHub, mitigated through traffic management improvements. Post-incident actions include enhancing detection, mitigation strategies, and resilience against future issues.