Add basic counts to dashboard

k8s/monitoring/templates/session-telemetry-dashboard.yaml

@@ -65,6 +65,98 @@ data:
           "title": "Overall Video Success Rate",
           "type": "stat"
         },
+        {
+          "datasource": "${logs}",
+          "fieldConfig": {
+            "defaults": {
+              "color": {
+                "mode": "thresholds"
+              },
+              "mappings": [],
+              "thresholds": {
+                "mode": "absolute",
+                "steps": [
+                  { "color": "green", "value": null }
+                ]
+              },
+              "unit": "none"
+            },
+            "overrides": []
+          },
+          "gridPos": {
+            "h": 4,
+            "w": 6,
+            "x": 6,
+            "y": 0
+          },
+          "id": 13,
+          "options": {
+            "orientation": "auto",
+            "reduceOptions": {
+              "calcs": ["lastNotNull"],
+              "fields": "",
+              "values": false
+            },
+            "showThresholdLabels": false,
+            "showThresholdMarkers": true
+          },
+          "pluginVersion": "8.0.0",
+          "targets": [
+            {
+              "expr": "sum(count_over_time({namespace=\"webrtc-be\", container=\"webrtc-be\"} |= \"type=join_telemetry\" [$__range]))",
+              "refId": "A"
+            }
+          ],
+          "description": "Total number of participants who joined a session in the selected time range.",
+          "title": "Participants Joined",
+          "type": "stat"
+        },
+        {
+          "datasource": "${logs}",
+          "fieldConfig": {
+            "defaults": {
+              "color": {
+                "mode": "thresholds"
+              },
+              "mappings": [],
+              "thresholds": {
+                "mode": "absolute",
+                "steps": [
+                  { "color": "blue", "value": null }
+                ]
+              },
+              "unit": "none"
+            },
+            "overrides": []
+          },
+          "gridPos": {
+            "h": 4,
+            "w": 6,
+            "x": 12,
+            "y": 0
+          },
+          "id": 14,
+          "options": {
+            "orientation": "auto",
+            "reduceOptions": {
+              "calcs": ["lastNotNull"],
+              "fields": "",
+              "values": false
+            },
+            "showThresholdLabels": false,
+            "showThresholdMarkers": true
+          },
+          "pluginVersion": "8.0.0",
+          "targets": [
+            {
+              "expr": "count(sum by (room) (count_over_time({namespace=\"webrtc-be\", container=\"webrtc-be\"} |= \"type=join_telemetry\" | logfmt [$__range])))",
+              "refId": "A"
+            }
+          ],
+          "description": "Total number of unique rooms joined in the selected time range.",
+          "title": "Unique Rooms Joined",
+          "type": "stat"
+        },
         {
           "datasource": "Prometheus",
           "gridPos": {