Add support for custom alert notification templates

Change-Id: I9e4e1287ea69960ae3b13734acc3eb0b087a8d86

ansible/roles/prometheus/tasks/config.yml

@@ -115,6 +115,32 @@
   notify:
     - Restart prometheus-alertmanager container
 
+- name: Find custom Alertmanager alert notification templates
+  find:
+    path: "{{ node_custom_config }}/prometheus/"
+    pattern: "*.tmpl"
+  run_once: True
+  delegate_to: localhost
+  register: alertmanager_notification_templates
+  when:
+    - enable_prometheus_alertmanager | bool
+
+- name: Copying over custom Alertmanager alert notification templates
+  become: true
+  vars:
+    service: "{{ prometheus_services['prometheus-alertmanager'] }}"
+  copy:
+    src: "{{ item.path }}"
+    dest: "{{ node_config_directory }}/prometheus-alertmanager/{{ item.path | basename }}"
+    mode: 0660
+  when:
+    - inventory_hostname in groups[service.group]
+    - service.enabled | bool
+    - alertmanager_notification_templates is defined and alertmanager_notification_templates.files | length > 0
+  with_items: "{{ alertmanager_notification_templates.files }}"
+  notify:
+    - Restart prometheus-alertmanager container
+
 - name: Copying over my.cnf for mysqld_exporter
   become: true
   vars:

ansible/roles/prometheus/templates/prometheus-alertmanager.json.j2

@@ -6,6 +6,13 @@
             "dest": "/etc/prometheus/alertmanager.yml",
             "owner": "prometheus",
             "perm": "0600"
+        },
+        {
+            "source": "{{ container_config_directory }}/*.tmpl",
+            "dest": "/etc/prometheus/",
+            "optional": true,
+            "owner": "prometheus",
+            "perm": "0600"
         }
     ],
     "permissions": [

ansible/roles/prometheus/templates/prometheus-alertmanager.yml.j2

@@ -17,4 +17,5 @@ receivers:
             username: '{{ keystone_admin_user }}'
             password: '{{ keystone_admin_password }}'
 {% endif %}
-templates: []
+templates:
+  - '/etc/prometheus/*.tmpl'

releasenotes/notes/add-support-for-custom-alertmanager-notifications-27f5d0474f470512.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Adds possibility for inlcuding custom alert notification templates with
+    Prometheus Alertmanager.