Merge branch 'feature_cumulative_dash' into 'master'

dashboard for cumulative overview of all bbb instances

See merge request !3

dashboards/cumulative.json

+{
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+        "builtIn": 1,
+        "datasource": "-- Grafana --",
+        "enable": true,
+        "hide": true,
+        "iconColor": "rgba(0, 211, 255, 1)",
+        "name": "Annotations & Alerts",
+        "type": "dashboard"
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+  "gnetId": null,
+  "graphTooltip": 0,
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+          "overrides": [],
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+        "showThresholdMarkers": true
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+      "targets": [
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+          "interval": "",
+          "legendFormat": "",
+          "refId": "A"
+        }
+      ],
+      "timeFrom": null,
+      "timeShift": null,
+      "title": "Participants",
+      "type": "gauge"
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+          "interval": "",
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+          "refId": "A"
+        }
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+      "timeShift": null,
+      "title": "Voice Participants",
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+          "interval": "",
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+      "timeFrom": null,
+      "timeShift": null,
+      "title": "Video Participants",
+      "type": "gauge"
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+      "targets": [
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+          "legendFormat": "{{service_id}}",
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+      "title": "Sum Network Transmit",
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