Add Prometheus as Vitrage datasource

Vitrage has already supported Prometheus as
datasource. Kolla can config it automatically,
just need a little changes, for example in
wsgi config file [1].

Co-Authored-By: Hieu LE <hieulq2@viettel.com.vn>

[1] https://review.openstack.org/#/c/584649/8/devstack/apache-vitrage.template

Change-Id: I64028a0dfd9887813b980a31c30c2c1b1046da61

ansible/group_vars/all.yml

@@ -910,3 +910,8 @@ enable_prometheus_cadvisor: "{{ enable_prometheus | bool }}"
 enable_prometheus_alertmanager: "{{ enable_prometheus | bool }}"
 enable_prometheus_ceph_mgr_exporter: "{{ enable_ceph | bool and enable_prometheus | bool }}"
 prometheus_alertmanager_user: "admin"
+
+############
+# Vitrage
+############
+enable_vitrage_prometheus_datasource: "{{ enable_prometheus | bool }}"

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

@@ -8,4 +8,13 @@ route:
   repeat_interval: 3h
 receivers:
   - name: default-receiver
+{% if enable_vitrage | bool and enable_vitrage_prometheus_datasource | bool %}
+    webhook_configs:
+      - send_resolved: true
+        url: '{{ public_protocol }}://{{ kolla_external_fqdn }}:{{ vitrage_api_port }}/v1/event'
+        http_config:
+          basic_auth:
+            username: '{{ keystone_admin_user }}'
+            password: '{{ keystone_admin_password }}'
+{% endif %}
 templates: []

ansible/roles/vitrage/defaults/main.yml

@@ -152,6 +152,8 @@ vitrage_datasource:
   # Document process to deploy vitrage+heat.
   - name: "heat.stack"
     enabled: "no"
+  - name: "prometheus"
+    enabled: "{{ enable_vitrage_prometheus_datasource | bool }}"
 
 vitrage_datasources: "{{ vitrage_datasource | selectattr('enabled', 'equalto', true) | list }}"
 

ansible/roles/vitrage/templates/wsgi-vitrage.conf.j2

@@ -26,4 +26,7 @@ TraceEnable off
   WSGIDaemonProcess vitrage group=vitrage processes={{ openstack_service_workers }} threads=1 user=vitrage python-path={{ python_path }}
   WSGIProcessGroup vitrage
   WSGIScriptAlias / "/var/www/cgi-bin/vitrage/app.wsgi"
+{% if enable_vitrage_prometheus_datasource | bool %}
+  WSGIPassAuthorization On
+{% endif %}
 </VirtualHost>

releasenotes/notes/add-prometheus-as-vitrage-datasource-3439b3f9925b8e8e.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - |
+    Configure Prometheus as Vitrage datasource automatically.