> they are not supposed to see it There's a whole lot of things that are not supposed to happen in the tech world, that happen all the time. Most people do not

> they are not supposed to see it There's a whole lot of things that are not supposed to happen in the tech world, that happen all the time. Most people do not run brand new stateless microservices in K8s. They run stateful apps on VMs in three year old badly configured OpenStack clusters. For what it's worth, moving the client traffic itself is seamless and totally fine. But first you have to get them to stop hard-coding the names of region and zone specific load balancers into their apps. You switch them over... traffic falls over... and it's your fault. Hence, big moves are coordinated with clients, not to mention feature tested, and then tested by sending some real traffic to the new cluster, before you shift all the traffic. The cloud is not magic, and if you treat it that way, it will bite you.