display individual metrics on hover

since this is stack chart now

assets/grafana/all-nodes-dashboard.json

@@ -320,7 +320,7 @@
             "msResolution": false,
             "shared": true,
             "sort": 0,
-            "value_type": "cumulative"
+            "value_type": "individual"
           },
           "type": "graph",
           "xaxis": {