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* remove usage of the "certificates" API for cert renewal "--use-api" option is removed from kubeadm alpha certs renew command since k8s 1.19 * Update kubeadm-certs.md * Update content/en/docs/tasks/administer-cluster/kubeadm/kubeadm-certs.md Co-authored-by: Lubomir I. Ivanov <neolit123@gmail.com> Co-authored-by: Lubomir I. Ivanov <neolit123@gmail.com>