With GKE you don't necessarily update your load balancer rules with a deploy correct? The linked thread points the blame for app engine deploys on waiting for GCLB to update.
Correct, you have software based load balancing under the covers.
My Google Load Balancers never move.. It is a single thing that points each node (physical machine) in the cluster, and distributes traffic between then.
Each node knows how to route traffic to each app. So when I deploy that app, the software load balancer at the node level will slowly move traffic over from old app to new app. Entire thing is MAGICAL. And 0 downtime, very very fast deploys.
Edit - But yes this explains iy. Changing the google load balancers is like a 5 minute ordeal. Total pain. Nice that with GKE you only need to touch them when your node count changes, which can be very rare (~monthly for me)
