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When joining a control plane node and "upgrading" the cluster setup (for example, to update etcd addresses after adding a new etcd) in the same playbook run, the node can take a bit of time to become ready after joining. This triggers a kubeadm preflight check (ControlPlaneNodesReady) in kubeadm upgrade, which is run directly after the join tasks. Add a configurable wait for the control plane node to become Ready to fix this race condition.