Fix deployment of Grafana

Some tasks were improperly generalized in change:
I4f1aa03e9a9faaf8aecd556dfeafdb834042e4cd
(simplify handlers)
This patch reverts that.

Change-Id: I38fbe319da50fc7d5a3fa3c4890f039ae900a60c
Closes-bug: #1845258
Signed-off-by: Radosław Piliszek <radoslaw.piliszek@gmail.com>

ansible/roles/grafana/tasks/config.yml

@@ -60,7 +60,7 @@
   with_items:
     - "{{ check_extra_conf_grafana.files }}"
   notify:
-    - Restart {{ item.key }} container
+    - Restart grafana container
 
 - name: Check if custom grafana home dashboard exists
   local_action: "stat path={{ node_custom_config }}/grafana/grafana_home_dashboard.json"
@@ -74,7 +74,7 @@
     mode: "0660"
   when: grafana_custom_dashboard_file.stat.exists
   notify:
-    - Restart {{ item.key }} container
+    - Restart grafana container
 
 - name: Configuring Prometheus as data source for Grafana
   vars:
@@ -93,7 +93,7 @@
     - "{{ node_custom_config }}/grafana/prometheus.yaml"
     - "prometheus.yaml.j2"
   notify:
-    - Restart {{ item.key }} container
+    - Restart grafana container
 
 - name: Check grafana containers
   become: true