review handler to prometheus container

handlers/main.yml

@@ -1,10 +1,10 @@
 ---
 - name: 'prometheus | server | restart container'
-  systemd:
-    name: openvpn@{{ ansible_hostname }}.service
-    state: started
-    enabled: yes
-  tags: ['prometheus']
+  docker_container:
+    name: prometheus
+    restart: yes
+  when:
+  - 'not register_docker_container_grafana.changed'
 
 - name: 'prometheus | node exporter | restart service'
   systemd: