Explained: Canary Releases, Blue/Green Deployments, and A/B Testing

Your team has just merged a significant change to the checkout flow. The pull request looked clean, the tests passed, staging was fine. But the last time you pushed a change like this straight to production, conversion dropped 12% for three hours before anyone noticed. You want to ship it — but not to everyone at once. You want a way to expose it to a small slice of real traffic, watch the numbers, and either expand it or pull it back. That insti… Read More