Add new roles for monitoring

ansible/roles/prometheus/handlers/main.yml

@@ -0,0 +1,11 @@
+## Restart Prometheus on changes
+- name: restart prometheus
+  ansible.builtin.service:
+    name: '{{ prometheus_service }}'
+    state: restarted
+
+## Restart Alertmanger on changes
+- name: restart alertmanager
+  ansible.builtin.service:
+    name: '{{ alertmanager_service }}'
+    state: restarted