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Automatic merge from submit-queue (batch tested with PRs 67776, 67503, 67679, 67786, 67830). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>. kubeadm - deprecate feature-gates HighAvailability, SelfHosting, CertsInSecrets **What this PR does / why we need it**: As for sig discussion (see meeting notes - August 22 - 2018) we are going to block usage of feature gates HighAvailability, SelfHosting, CertsInSecrets for new clusters and block updates to v1.12 of existing clusters using such features. **Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` Fixes # https://github.com/kubernetes/kubeadm/issues/1058 **Special notes for your reviewer**: I'm going to open issue to track code cleanup in v1.13 **Release note**: ```release-note kubeadm - feature-gates HighAvailability, SelfHosting, CertsInSecrets are now deprecated and can't be used anymore for new clusters. Update of cluster using above feature-gates flag is not supported ``` /sig cluster-lifecycle /kind feature /kind cleanup /assign @timothysc /cc