Canary deployment strategy also known as blue/green deployment, is an industry standard protocol for deployment with zero downtime by utilizing two separate environments and switching during source code updates or rollbacks. Canary deployments have a lot of advantages when it comes to multi-server configuration and aids in technical cases like version rollbacks, and a/b testing.
We live in a world built by our collective ingenuity and imagination. We see further and more than our predecessors, not because of keener vision or greater heights but because we are standing on the shoulders of giants that came before us. The Japanese word "sensei" literally means the person who came before.