mariadb: Deprecate wsrep-notify.sh

Change-Id: I14376dac46809f8bb466ec41f279be8d323d459d

ansible/roles/mariadb/tasks/config.yml

@@ -82,6 +82,12 @@
   notify:
     - restart mariadb
 
+- name: Warn about deprecation
+  debug:
+    msg: >
+      wsrep-notify.sh script is deprecated and will be removed in Xena
+  when: not enable_mariadb_clustercheck | bool
+
 - name: Copying over wsrep-notify.sh
   template:
     src: "{{ role_path }}/templates/wsrep-notify.sh.j2"

releasenotes/notes/deprecate-wsrep-notify-d21ab17425e5065c.yaml

+---
+deprecations:
+  - |
+    The ``wsrep-notify.sh`` script used for disabling ``haproxy`` user when
+    node is not ready for accepting connections in deployments without
+    ``mariadb-clustercheck`` is deprecated and will be removed in Xena
+    release. It has been unreliable and the recommended (enabled by default)
+    approach is to deploy ``mariadb-clustercheck``.