feat(notifications) skip join notifications when meetings grow large

react/features/notifications/actions.js

 import type { Dispatch } from 'redux';
 
 import { NOTIFICATIONS_ENABLED, getFeatureFlag } from '../base/flags';
+import { getParticipantCount } from '../base/participants/functions';
 
 import {
     CLEAR_NOTIFICATIONS,
     SET_NOTIFICATIONS_ENABLED,
     SHOW_NOTIFICATION
 } from './actionTypes';
-import { NOTIFICATION_TIMEOUT, NOTIFICATION_TYPE } from './constants';
+import {
+    NOTIFICATION_TIMEOUT,
+    NOTIFICATION_TYPE,
+    SILENT_JOIN_THRESHOLD
+} from './constants';
 
 /**
  * Clears (removes) all the notifications.
  * @private
  * @type {Function}
  */
-const _throttledNotifyParticipantConnected = throttle((dispatch: Dispatch<any>) => {
+const _throttledNotifyParticipantConnected = throttle((dispatch: Dispatch<any>, getState: Function) => {
+    const participantCount = getParticipantCount(getState());
+
+    // Skip join notifications altogether for large meetings.
+    if (participantCount > SILENT_JOIN_THRESHOLD) {
+        joinedParticipantsNames = [];
+
+        return;
+    }
+
     const joinedParticipantsCount = joinedParticipantsNames.length;
 
     let notificationProps;
 export function showParticipantJoinedNotification(displayName: string) {
     joinedParticipantsNames.push(displayName);
 
-    return (dispatch: Dispatch<any>) => _throttledNotifyParticipantConnected(dispatch);
+    return (dispatch: Dispatch<any>, getState: Function) => _throttledNotifyParticipantConnected(dispatch, getState);
 }

react/features/notifications/constants.js

     [NOTIFICATION_TYPE.SUCCESS]: 3,
     [NOTIFICATION_TYPE.WARNING]: 4
 };
+
+/**
+ * Amount of participants beyond which no join notification will be emitted.
+ */
+export const SILENT_JOIN_THRESHOLD = 30;