Add Jenkins to Prometheus targets

Change-Id: Ie9853b9860b34536ded4a7583c48c735e75bb7b7
diff --git a/prometheus/files/prometheus.yml b/prometheus/files/prometheus.yml
index 445c476..25c9832 100644
--- a/prometheus/files/prometheus.yml
+++ b/prometheus/files/prometheus.yml
@@ -243,3 +243,10 @@
       port: {{ target.port }}
   {%- endfor %}
 {%- endif %}
+
+{%- if grains.get('jenkins_plugins', {}).get('prometheus', {}).get('version', False) %}
+  - job_name: jenkins
+    metrics_path: '/prometheus'
+    static_configs:
+    - targets: ['{{ pillar.get('jenkins').get('client').get('master').get('host') }}:{{ pillar.get('jenkins').get('client').get('master').get('port') }}']
+{%- endif %}