add node-based upgrade (#7785)

docs/upgrades.md

@@ -62,6 +62,29 @@ If you want to manually control the upgrade procedure, you can use the variables
 `upgrade_node_confirm: true` - waiting to confirmation to upgrade next node
 `upgrade_node_pause_seconds: 60` - pause 60 seconds before upgrade next node
 
+## Node-based upgrade
+
+If you don't want to upgrade all nodes in one run, you can use `--limit` [patterns](https://docs.ansible.com/ansible/latest/user_guide/intro_patterns.html#patterns-and-ansible-playbook-flags).
+
+Before using `--limit` run playbook `facts.yml` without the limit to refresh facts cache for all nodes:
+
+```ShellSession
+ansible-playbook facts.yml -b -i inventory/sample/hosts.ini
+```
+
+After this upgrade control plane and etcd groups [#5147](https://github.com/kubernetes-sigs/kubespray/issues/5147):
+
+```ShellSession
+ansible-playbook upgrade-cluster.yml -b -i inventory/sample/hosts.ini -e kube_version=v1.20.7 --limit "kube_control_plane:etcd"
+```
+
+Now you can upgrade other nodes in any order and quantity:
+
+```ShellSession
+ansible-playbook upgrade-cluster.yml -b -i inventory/sample/hosts.ini -e kube_version=v1.20.7 --limit "node4:node6:node7:node12"
+ansible-playbook upgrade-cluster.yml -b -i inventory/sample/hosts.ini -e kube_version=v1.20.7 --limit "node5*"
+```
+
 ## Multiple upgrades
 
 :warning: [Do not skip releases when upgrading--upgrade by one tag at a time.](https://github.com/kubernetes-sigs/kubespray/issues/3849#issuecomment-451386515) :warning: