Add Prometheus Mysqld exporter

Change-Id: I670597179b701aab1ca8e433be2f3abf1e78650a

prometheus/README.rst

@@ -34,3 +34,26 @@ Install node_exporter
 
     cd /opt/openstack-ansible-ops/prometheus
     openstack-ansible installNodeExporter.yml
+
+
+If you want to deploy the mysqld_exporter, you need to create the Galera user for it first
+
+.. code-block:: yaml
+
+    galera_additional_users:
+      - name: "exporter"
+        host: '%'
+        password: "{{ prometheus_mysqld_exporter_galera_password }}"
+        priv: '*.*:PROCESS,REPLICATION CLIENT,SELECT,SLAVE MONITOR'
+        resource_limits:
+          MAX_USER_CONNECTIONS: 3
+        check_hostname: false
+        state: present
+
+
+Then install the mysqld_exporter
+
+.. code-block:: bash
+
+    cd /opt/openstack-ansible-ops/prometheus
+    openstack-ansible installMysqldExporter.yml

prometheus/installMysqldExporter.yml

@@ -0,0 +1,17 @@
+---
+
+
+- name: Refresh local facts
+  hosts: galera_all
+  tasks:
+    - name: refresh local facts
+      setup:
+
+- name: mysqld_exporter
+  hosts: galera_all
+  roles:
+    - role: prometheus.prometheus.mysqld_exporter
+      vars:
+        mysqld_exporter_host: "{{ ansible_host }}"
+        mysqld_exporter_password: "{{ prometheus_mysqld_exporter_galera_password }}"
+        mysqld_exporter_web_listen_address: "{{ ansible_host }}:9104"