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Ensure kube-proxy waits for the services/endpointslices informer caches to be synced *and* all pre-sync events delivered before setting isInitialized=true. Otherwise, in clusters with many services, some services may be missing from svcPortMap when kube-proxy starts (e.g. during daemonset rollout). This can cause kube-proxy to temporarily remove service DNAT rules and then skip cleanup of UDP conntrack entries to a service VIP. Resolves: https://github.com/kubernetes/kubernetes/issues/126468