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Automatic merge from submit-queue (batch tested with PRs 45247, 45810, 45034, 45898, 45899) [Federation] Segregate DNS related code to separate controller **What this PR does / why we need it**: This is the continuation of service controller re-factor work as outlined in #41253 This PR segregates DNS related code from service controller to another controller `service-dns controller` which manages the DNS records on the configured DNS provider. `service-dns controller` monitors the federated services for the ingress annotations and create/update/delete DNS records accordingly. `service-dns controller` can be optionally disabled and DNS record management could be done by third party components by monitoring the ingress annotations on federated services. (This would enable something like federation middleware for CoreDNS where federation api server could be used as a backend to CoreDNS eliminating the need for etcd storage.) **Special notes for your reviewer**: **Release note**: ``` Federation: A new controller for managing DNS records is introduced which can be optionally disabled to enable third party components to manage DNS records for federated services. ``` cc @kubernetes/sig-federation-pr-reviews |
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