If anyone interested in k8s cluster downgrade please refer the attached.
I didn’t find any downgrade docs in https://kubernetes.io/
you just downgraded the tools kubeadm,kubelet and kubectl not the actual cluster components
its just a reverse process of this one: https://kubernetes.io/docs/tasks/administer-cluster/kubeadm/kubeadm-upgrade/
Then where are the below steps?
kubeadm upgrade plan
sudo kubeadm upgrade apply v1.21.x