Add prometheus main dashboard

Change-Id: I75d0d49a63d0ae8ca463c36df190da0e1aa8810c
diff --git a/apache/meta/grafana.yml b/apache/meta/grafana.yml
index 2ee1595..e7b85bf 100644
--- a/apache/meta/grafana.yml
+++ b/apache/meta/grafana.yml
@@ -7,7 +7,7 @@
     datasource: prometheus
     format: json
     template: apache/files/grafana_dashboards/apache_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 = 'apache' AND environment_label = '$environment' AND $timeFilter GROUP BY time($interval) fill(null)
+  main_prometheus:
+    datasource: prometheus
+    row:
+      ost-middleware:
+        title: Middleware
+        panel:
+          apache:
+            title: Apache
+            links:
+            - dashboard: Apache
+              title: Apache
+              type: dashboard
+            target:
+              cluster_status:
+                expr: avg(apache_up) by (name)