Platform & DevOps·Traffic into and inside the cluster
a controller keeps a live list of which instances are ready, and removing one from that list is what actually stops traffic.
Service endpoint
Also calledendpoints, endpoint slice, backend list
The maintained set of addresses currently eligible to receive a service's traffic, updated as instances become ready or unready. It is the join between health checking and routing, and it is the object to look at when a service is sending traffic to something that is not answering. Propagation is not instant — the list, the proxies and the DNS caches all update independently — which is the mechanism behind the handful of errors every rollout produces.