topk 25 for popular maps

manifests/grafana-dashboards/exneuland-dashboard.yaml

@@ -294,7 +294,7 @@ data:
               "refId": "A"
             }
           ],
-          "title": "Popular Maps (now)",
+          "title": "Popular Maps (Top 25) (now)",
           "type": "piechart"
         },
         {
@@ -734,13 +734,13 @@ data:
           "targets": [
             {
               "exemplar": true,
-              "expr": "label_replace((sum by (room) (exneuland_cowboy_init_count{namespace=\"$environment\"})) - (sum by (room) (exneuland_cowboy_terminate_count{namespace=\"$environment\"})), \"roomslug\", \"$1\", \"room\", \"https://[^/]+/@/rc3_21/(.+)\")",
+              "expr": "label_replace(topk(25, sum by (room) (exneuland_cowboy_init_count{namespace=\"$environment\"})) - (sum by (room) (exneuland_cowboy_terminate_count{namespace=\"$environment\"})), \"roomslug\", \"$1\", \"room\", \"https://[^/]+/@/rc3_21/(.+)\")",
               "interval": "",
               "legendFormat": "{{roomslug}}",
               "refId": "A"
             }
           ],
-          "title": "Popular Maps (now)",
+          "title": "Popular Maps (Top 25) (now)",
           "type": "timeseries"
         },
         {