War Story: How We Survived a 2026 GitHub Outage Using GitLab 16.0 and Mirrored Repos

The morning of March 12, 2026 started like any other sprint day for our 12-person backend engineering team. We had standups at 9 AM, PR reviews queued, and a production deployment scheduled for 2 PM. None of us expected that by 10:15 AM, GitHub’s entire global infrastructure would go dark, taking down code repositories, CI/CD pipelines, and the GitHub Packages registry for 8 hours straight.

The Calm Before the Storm

We’d adopted a multi-provider repo strategy 6 months earlier, after a minor GitHub regional outage in 2025 caused a 4-hour delay in our payment processing service. Our DevOps lead mandated that all critical repositories be mirrored to a self-hosted GitLab 16.0 instance, with hourly sync for active repos and daily sync for low-traffic projects.…