Minor dashboard updates (#783)

Author: tmiddlet2666

dashboards/grafana/federation-details-dashboard.json

@@ -706,7 +706,10 @@
       "id": 30,
       "options": {
         "legend": {
-          "calcs": [],
+          "calcs": [
+            "max",
+            "mean"
+          ],
           "displayMode": "list",
           "placement": "bottom",
           "showLegend": true
@@ -723,7 +726,7 @@
           "editorMode": "code",
           "expr": "sum(irate(coherence_federation_destination_total_bytes_sent{namespace=~\"${Namespace:.*}\",cluster=\"${ClusterName:raw}\", coherence_service='$ServiceName', name='$Destination'}[1m]) * 8 / 1000000)",
           "interval": "",
-          "legendFormat": "Total Rate",
+          "legendFormat": "Rate",
           "range": true,
           "refId": "A"
         }

dashboards/grafana/federation-summary-dashboard.json

@@ -672,8 +672,8 @@
       "options": {
         "legend": {
           "calcs": [
-            "lastNotNull",
-            "max"
+            "max",
+            "mean"
           ],
           "displayMode": "list",
           "placement": "bottom",