Merge branch 'feature_cumulative_dash' into 'master'

dashboard for cumulative overview of all bbb instances

See merge request !3

dashboards/cumulative.json

+{
+  "annotations": {
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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,
+  "id": null,
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+                  "value": 800
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+          "overrides": [],
+          "values": false
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+        "orientation": "auto",
+        "showThresholdLabels": false,
+        "showThresholdMarkers": true
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+      "pluginVersion": "6.7.1",
+      "targets": [
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+          "expr": "sum(bbb_meetings_participants)",
+          "interval": "",
+          "legendFormat": "",
+          "refId": "A"
+        }
+      ],
+      "timeFrom": null,
+      "timeShift": null,
+      "title": "Participants",
+      "type": "gauge"
+    },
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+        "showThresholdMarkers": true
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+          "interval": "",
+          "legendFormat": "",
+          "refId": "A"
+        }
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+      "timeFrom": null,
+      "timeShift": null,
+      "title": "Voice Participants",
+      "type": "gauge"
+    },
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+          "interval": "",
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+      "timeFrom": null,
+      "timeShift": null,
+      "title": "Video Participants",
+      "type": "gauge"
+    },
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+      "spaceLength": 10,
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+          "legendFormat": "{{service_id}}",
+          "refId": "A"
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+      "timeRegions": [],
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+      "title": "Participants",
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+      "spaceLength": 10,
+      "stack": true,
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+      "targets": [
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+          "interval": "",
+          "legendFormat": "{{service_id}}",
+          "refId": "A"
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+      "title": "Sum Network Transmit",
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