Add some warning information about deprecating non-kubeadm code (#3759)

upgrade-cluster.yml

@@ -13,6 +13,19 @@
   vars:
     ansible_connection: local
 
+- hosts: localhost
+  tasks:
+    - name: deploy warning for non kubeadm
+      debug:
+        msg: "DEPRECATION: non-kubeadm deployment is deprecated from v2.9. Will be removed in next release."
+      when: not kubeadm_enabled and not skip_non_kubeadm_warning
+
+    - name: deploy cluster for non kubeadm
+      pause:
+        prompt: "Are you sure you want to deploy cluster using the deprecated non-kubeadm mode."
+        echo: no
+      when: not kubeadm_enabled and not skip_non_kubeadm_warning
+
 - hosts: bastion[0]
   gather_facts: False
   roles: