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Automatic merge from submit-queue. 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>. Allow version arg to be optional in "kubeadm upgrade apply" **What this PR does / why we need it**: This PR make the version arg optional if --config is specified and .KuberneteVersion is available. **Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes # fixes https://github.com/kubernetes/kubeadm/issues/460 **Special notes for your reviewer**: ```release-note Allow version arg in kubeadm upgrade apply to be optional if config file already have version info ```