feat(statistics) remove AudioOutputProblemDetector

It has been broken for over 3 years now, since ca325f5#diff-9e19da30f465ca5665ac3d7ca1aa03d0498aed1be0cb2d7eeb27684a2636da77

Ever since that change, the "audioLevelReportHistory" property is not
populated, so it justs acts on nothing an generates bogus log lines such
as:

```
[modules/statistics/AudioOutputProblemDetector.js] A potential problem is detected with the audio output for participant b5fb30bc, local audio levels: [null,null], remote audio levels: undefined
```

Since nobody seems to have noticed in 3 years it's safe to assume we
don't need this at all, so it gets the axe treatment.

JitsiConference.js

@@ -30,7 +30,6 @@ import { LiteModeContext } from './modules/litemode/LiteModeContext';
 import { QualityController } from './modules/qualitycontrol/QualityController';
 import RecordingManager from './modules/recording/RecordingManager';
 import Settings from './modules/settings/Settings';
-import AudioOutputProblemDetector from './modules/statistics/AudioOutputProblemDetector';
 import AvgRTPStatsReporter from './modules/statistics/AvgRTPStatsReporter';
 import LocalStatsCollector from './modules/statistics/LocalStatsCollector';
 import SpeakerStatsCollector from './modules/statistics/SpeakerStatsCollector';
@@ -221,14 +220,6 @@ export default function JitsiConference(options) {
     this.avgRtpStatsReporter
         = new AvgRTPStatsReporter(this, options.config.avgRtpStatsN || 15);
 
-    /**
-     * Detects issues with the audio of remote participants.
-     * @type {AudioOutputProblemDetector}
-     */
-    if (!options.config.disableAudioLevels) {
-        this._audioOutputProblemDetector = new AudioOutputProblemDetector(this);
-    }
-
     /**
      * Indicates whether the connection is interrupted or not.
      */
@@ -649,11 +640,6 @@ JitsiConference.prototype.leave = async function(reason) {
         this.avgRtpStatsReporter = null;
     }
 
-    if (this._audioOutputProblemDetector) {
-        this._audioOutputProblemDetector.dispose();
-        this._audioOutputProblemDetector = null;
-    }
-
     if (this.e2eping) {
         this.e2eping.stop();
         this.e2eping = null;

modules/connectivity/ConnectionQuality.js

@@ -366,8 +366,7 @@ export default class ConnectionQuality {
             connectionQuality: this._localStats.connectionQuality,
             jvbRTT: this._localStats.jvbRTT,
             serverRegion: this._localStats.serverRegion,
-            maxEnabledResolution: this._localStats.maxEnabledResolution,
-            avgAudioLevels: this._localStats.localAvgAudioLevels
+            maxEnabledResolution: this._localStats.maxEnabledResolution
         };
 
         try {
@@ -450,8 +449,7 @@ export default class ConnectionQuality {
             connectionQuality: data.connectionQuality,
             jvbRTT: data.jvbRTT,
             serverRegion: data.serverRegion,
-            maxEnabledResolution: data.maxEnabledResolution,
-            avgAudioLevels: data.avgAudioLevels
+            maxEnabledResolution: data.maxEnabledResolution
         };
 
         this.eventEmitter.emit(

modules/statistics/RTPStatsCollector.js

@@ -137,7 +137,6 @@ export default function StatsCollector(peerconnection, audioLevelsInterval, stat
     this.peerconnection = peerconnection;
     this.currentStatsReport = null;
     this.previousStatsReport = null;
-    this.audioLevelReportHistory = {};
     this.audioLevelsIntervalId = null;
     this.eventEmitter = eventEmitter;
     this.conferenceStats = new ConferenceStats();
@@ -385,29 +384,6 @@ StatsCollector.prototype._processAndEmitReport = function() {
             calculatePacketLoss(lostPackets.upload, totalPackets.upload)
     };
 
-    const avgAudioLevels = {};
-    let localAvgAudioLevels;
-
-    Object.keys(this.audioLevelReportHistory).forEach(ssrc => {
-        const { data, isLocal } = this.audioLevelReportHistory[ssrc];
-        const avgAudioLevel = data.reduce((sum, currentValue) => sum + currentValue) / data.length;
-
-        if (isLocal) {
-            localAvgAudioLevels = avgAudioLevel;
-        } else {
-            const track = this.peerconnection.getTrackBySSRC(Number(ssrc));
-
-            if (track) {
-                const participantId = track.getParticipantId();
-
-                if (participantId) {
-                    avgAudioLevels[participantId] = avgAudioLevel;
-                }
-            }
-        }
-    });
-    this.audioLevelReportHistory = {};
-
     this.eventEmitter.emit(
         StatisticsEvents.CONNECTION_STATS,
         this.peerconnection,
@@ -418,9 +394,7 @@ StatsCollector.prototype._processAndEmitReport = function() {
             resolution: resolutions,
             framerate: framerates,
             codec: codecs,
-            transport: this.conferenceStats.transport,
-            localAvgAudioLevels,
-            avgAudioLevels
+            transport: this.conferenceStats.transport
         });
     this.conferenceStats.transport = [];
 };