Enable prometheus pushgateway persistent storage

Change-Id: If539f26909bd56b168a806773bb9c6574c86bf40
Closes-bug: PROD-21073

metadata/service/pushgateway/container.yml

@@ -7,3 +7,5 @@ parameters:
       bind:
         address: 0.0.0.0
         port: 9091
+      dir:
+        data: /srv/volumes/local/pushgateway

prometheus/init.sls

@@ -1,6 +1,7 @@
 {%- if pillar.prometheus.get('server', {}).get('enabled', False) or
        pillar.prometheus.get('relay', {}).get('enabled', False) or
        pillar.prometheus.get('alerta', {}).get('enabled', False) or
+       pillar.prometheus.get('pushgateway', {}).get('enabled', False) or
        pillar.prometheus.alertmanager is defined or
        pillar.prometheus.exporters is defined %}
 include:
@@ -13,6 +14,9 @@ include:
   {%- if pillar.prometheus.get('alerta', {}).get('enabled', False) %}
   - prometheus.alerta
   {%- endif %}
+  {%- if pillar.prometheus.get('pushgateway', {}).get('enabled', False) %}
+  - prometheus.pushgateway
+  {%- endif %}
   {%- if pillar.prometheus.alertmanager is defined %}
   - prometheus.alertmanager
   {%- endif %}

prometheus/map.jinja

@@ -26,6 +26,15 @@
 }, merge=salt['pillar.get']('prometheus:exporters')) %}
 {%- do salt['defaults.merge'](exporters, grains.get('prometheus', {}).get('exporters', {}))  %}
 
+{% set pushgateway = salt['grains.filter_by']({
+  'default': {
+    'enabled': True,
+    'dir': {
+      'data': '/srv/volumes/local/pushgateway',
+    }
+  },
+}, merge=salt['pillar.get']('prometheus:pushgateway')) %}
+
 {%- set monitoring = salt['grains.filter_by']({
   'default': {
     'remote_storage_adapter': {

prometheus/pushgateway.sls

@@ -0,0 +1,12 @@
+{% from "prometheus/map.jinja" import pushgateway with context %}
+{%- if pushgateway.enabled %}
+
+{%- if pillar.docker is defined and pillar.docker.host is defined %}
+
+{{pushgateway.dir.data}}:
+  file.directory:
+    - makedirs: True
+    - mode: 755
+
+{%- endif %}
+{%- endif %}

tests/pillar/pushgateway.sls

@@ -5,3 +5,5 @@ prometheus:
       address: 0.0.0.0
       port: 9091
     external_port: 15012
+    dir:
+      data: /opt/pushgateway/data