A surge in AI-assisted and agentic coding activity pushed GitHub’s infrastructure past its reliability limits in mid-2026, with AI-agent-opened pull requests rising from about 4 million in September 2025 to more than 17 million by March 2026. GitHub logged nine service-degrading incidents in May 2026 and multiple additional incidents in June, with independent monitoring firms reporting availability below GitHub’s customary 99.9% enterprise threshold. Microsoft confirmed it began routing a portion of GitHub’s traffic through rival cloud provider AWS as overflow capacity to stabilize the platform, and GitHub briefly paused new Copilot subscriptions in April 2026 to manage capacity pressure.