Init commit

server/core/lib/opentelemetry/metric-helpers/viewers-observers-builder.ts

@@ -0,0 +1,24 @@
+import { Meter } from '@opentelemetry/api'
+import { VideoScope, ViewerScope } from '@server/lib/views/shared/index.js'
+import { VideoViewsManager } from '@server/lib/views/video-views-manager.js'
+
+export class ViewersObserversBuilder {
+
+  constructor (private readonly meter: Meter) {
+
+  }
+
+  buildObservers () {
+    this.meter.createObservableGauge('peertube_viewers_total', {
+      description: 'Total viewers on the instance'
+    }).addCallback(observableResult => {
+      for (const viewerScope of [ 'local', 'remote' ] as ViewerScope[]) {
+        for (const videoScope of [ 'local', 'remote' ] as VideoScope[]) {
+          const result = VideoViewsManager.Instance.getTotalViewers({ viewerScope, videoScope })
+
+          observableResult.observe(result, { viewerOrigin: viewerScope, videoOrigin: videoScope })
+        }
+      }
+    })
+  }
+}