Add prometheus main dashboard

Change-Id: I10c8dcdfe04d9a49924f7cd3c76af04f95b66392
diff --git a/rabbitmq/meta/grafana.yml b/rabbitmq/meta/grafana.yml
index 10976c1..7f25b08 100644
--- a/rabbitmq/meta/grafana.yml
+++ b/rabbitmq/meta/grafana.yml
@@ -7,7 +7,7 @@
     datasource: prometheus
     format: json
     template: rabbitmq/files/grafana_dashboards/rabbitmq_prometheus.json
-  main:
+  main_influxdb:
     datasource: influxdb
     row:
       ost-middleware:
@@ -23,3 +23,18 @@
               cluster_status:
                 rawQuery: true
                 query: SELECT last(value) FROM cluster_status WHERE cluster_name = 'rabbitmq' AND environment_label = '$environment' AND $timeFilter GROUP BY time($interval) fill(null)
+  main_prometheus:
+    datasource: prometheus
+    row:
+      ost-middleware:
+        title: Middleware
+        panel:
+          rabbitmq:
+            title: RabbitMQ
+            links:
+            - dashboard: RabbitMQ
+              title: RabbitMQ
+              type: dashboard
+            target:
+              cluster_status:
+                expr: avg(rabbitmq_up) by (name)