Posthog add reconnect event (#3953)

* Add Posthog events for Call reconnect including the reason

* Expose single trackCallReconnecting() entry point on PosthogAnalytics

* Track reconnect duration and align with existing analytics pattern

* Refactor combined$ to return [connected, reason] tuple

* Update firefoxUserPrefs to allow getUserMedia and enumerateDevices on CI
---------

Co-authored-by: Valere <bill.carson@valrsoft.com>
Co-authored-by: Robin <robin@robin.town>
Co-authored-by: Timo K <toger5@hotmail.de>

playwright.config.ts

@@ -79,6 +79,11 @@ export default defineConfig({
           firefoxUserPrefs: {
             "permissions.default.microphone": 1,
             "permissions.default.camera": 1,
+            // Equivalent to Chromium's --use-fake-device-for-media-stream:
+            // feeds a synthetic media stream so getUserMedia and
+            // enumerateDevices work on CI runners without real hardware.
+            "media.navigator.streams.fake": true,
+            "media.navigator.permission.disabled": true,
           },
         },
       },

playwright/create-call.spec.ts

@@ -73,6 +73,9 @@ test("BugFix: When unmuting in lobby, you had to click twice to unmute in call",
   const microphoneButton = page.getByTestId("incall_mute");
   const cameraButton = page.getByTestId("incall_videomute");
 
+  // Wait for devices to enumerate before the button enables.
+  await expect(microphoneButton).toBeEnabled({ timeout: 10_000 });
+
   await microphoneButton.click();
   await cameraButton.click();
 

src/analytics/PosthogAnalytics.ts

@@ -26,6 +26,7 @@ import {
   QualitySurveyEventTracker,
   CallDisconnectedEventTracker,
   CallConnectDurationTracker,
+  CallReconnectingTracker,
 } from "./PosthogEvents";
 import { Config } from "../config/Config";
 import { getUrlParams } from "../UrlParams";
@@ -421,4 +422,5 @@ export class PosthogAnalytics {
   public eventQualitySurvey = new QualitySurveyEventTracker();
   public eventCallDisconnected = new CallDisconnectedEventTracker();
   public eventCallConnectDuration = new CallConnectDurationTracker();
+  public eventCallReconnecting = new CallReconnectingTracker();
 }

src/analytics/PosthogEvents.test.ts

@@ -18,7 +18,11 @@ import { logger } from "matrix-js-sdk/lib/logger";
 import { type MatrixRTCSession } from "matrix-js-sdk/lib/matrixrtc";
 
 import { PosthogAnalytics } from "./PosthogAnalytics";
-import { CallEndedTracker } from "./PosthogEvents";
+import {
+  CallEndedTracker,
+  CallReconnectingTracker,
+  type CallReconnectingReason,
+} from "./PosthogEvents";
 import { mockConfig } from "../utils/test";
 
 const defaultCounters = {
@@ -89,6 +93,11 @@ describe("CallEnded", () => {
         roomEventEncryptionKeysSent: 10,
         roomEventEncryptionKeysReceived: 5,
         roomEventEncryptionKeysReceivedAverageAge: 100,
+        callReconnectingCount: 0,
+        callReconnectingCountSync: 0,
+        callReconnectingCountMembership: 0,
+        callReconnectingCountProbablyLeft: 0,
+        callReconnectingCountLivekit: 0,
       },
       { send_instantly: true },
     );
@@ -159,4 +168,70 @@ describe("CallEnded", () => {
       { send_instantly: false },
     );
   });
+
+  it("includes per-reason reconnecting counts in CallEnded", () => {
+    const tracker = new CallEndedTracker();
+    const mockSession = createMockRtcSession();
+
+    tracker.cacheStartCall(new Date());
+    tracker.cacheReconnecting("sync");
+    tracker.cacheReconnecting("sync");
+    tracker.cacheReconnecting("livekit");
+    tracker.cacheReconnecting("membership");
+    tracker.track("test-call-id", 1, false, mockSession);
+
+    expect(PosthogAnalytics.instance.trackEvent).toHaveBeenCalledWith(
+      expect.objectContaining({
+        callReconnectingCount: 4,
+        callReconnectingCountSync: 2,
+        callReconnectingCountMembership: 1,
+        callReconnectingCountProbablyLeft: 0,
+        callReconnectingCountLivekit: 1,
+      }),
+      expect.anything(),
+    );
+  });
+});
+
+describe("CallReconnecting", () => {
+  beforeAll(() => {
+    mockConfig();
+  });
+
+  beforeEach(() => {
+    vi.restoreAllMocks();
+    vi.spyOn(PosthogAnalytics.instance, "trackEvent").mockImplementation(
+      () => {},
+    );
+  });
+
+  afterAll(() => {
+    PosthogAnalytics.resetInstance();
+  });
+
+  it("tracks event with correct shape", () => {
+    const tracker = new CallReconnectingTracker();
+    tracker.track("!room:example.org", "sync", 3.5);
+
+    expect(PosthogAnalytics.instance.trackEvent).toHaveBeenCalledWith({
+      eventName: "CallReconnecting",
+      callId: "!room:example.org",
+      reason: "sync",
+      reconnectDuration: 3.5,
+    });
+  });
+
+  it.each([
+    "sync",
+    "membership",
+    "probablyLeft",
+    "livekit",
+  ] as CallReconnectingReason[])("tracks reason %s correctly", (reason) => {
+    const tracker = new CallReconnectingTracker();
+    tracker.track("!room:example.org", reason, 1.0);
+
+    expect(PosthogAnalytics.instance.trackEvent).toHaveBeenCalledWith(
+      expect.objectContaining({ reason, reconnectDuration: 1.0 }),
+    );
+  });
 });

src/analytics/PosthogEvents.ts

@@ -17,6 +17,7 @@ import {
 
 interface CallEnded extends IPosthogEvent {
   eventName: "CallEnded";
+  // the callId posthog key is essentially a Matrix roomId
   callId: string;
   callParticipantsOnLeave: number;
   callParticipantsMax: number;
@@ -24,16 +25,43 @@ interface CallEnded extends IPosthogEvent {
   roomEventEncryptionKeysSent: number;
   roomEventEncryptionKeysReceived: number;
   roomEventEncryptionKeysReceivedAverageAge: number;
+  callReconnectingCount: number;
+  callReconnectingCountSync: number;
+  callReconnectingCountMembership: number;
+  callReconnectingCountProbablyLeft: number;
+  callReconnectingCountLivekit: number;
 }
 
 export class CallEndedTracker {
-  private cache: { startTime?: Date; maxParticipantsCount: number } = {
+  private cache: {
+    startTime?: Date;
+    maxParticipantsCount: number;
+    reconnectingCount: number;
+    reconnectingCountByReason: Record<CallReconnectingReason, number>;
+  } = {
     startTime: undefined,
     maxParticipantsCount: 0,
+    reconnectingCount: 0,
+    reconnectingCountByReason: {
+      sync: 0,
+      membership: 0,
+      probablyLeft: 0,
+      livekit: 0,
+    },
   };
 
   public cacheStartCall(time: Date): void {
-    this.cache.startTime = time;
+    this.cache = {
+      startTime: time,
+      maxParticipantsCount: 0,
+      reconnectingCount: 0,
+      reconnectingCountByReason: {
+        sync: 0,
+        membership: 0,
+        probablyLeft: 0,
+        livekit: 0,
+      },
+    };
   }
 
   public cacheParticipantCountChanged(count: number): void {
@@ -43,6 +71,11 @@ export class CallEndedTracker {
     );
   }
 
+  public cacheReconnecting(reason: CallReconnectingReason): void {
+    this.cache.reconnectingCount++;
+    this.cache.reconnectingCountByReason[reason]++;
+  }
+
   public track(
     callId: string,
     callParticipantsNow: number,
@@ -67,6 +100,14 @@ export class CallEndedTracker {
                   .roomEventEncryptionKeysReceivedTotalAge /
                 rtcSession.statistics.counters.roomEventEncryptionKeysReceived
               : 0,
+          callReconnectingCount: this.cache.reconnectingCount,
+          callReconnectingCountSync: this.cache.reconnectingCountByReason.sync,
+          callReconnectingCountMembership:
+            this.cache.reconnectingCountByReason.membership,
+          callReconnectingCountProbablyLeft:
+            this.cache.reconnectingCountByReason.probablyLeft,
+          callReconnectingCountLivekit:
+            this.cache.reconnectingCountByReason.livekit,
         },
         { send_instantly: sendInstantly },
       );
@@ -80,6 +121,7 @@ export class CallEndedTracker {
 
 interface CallStarted extends IPosthogEvent {
   eventName: "CallStarted";
+  // the callId posthog key is essentially a Matrix roomId
   callId: string;
 }
 
@@ -140,6 +182,7 @@ export class LoginTracker {
 interface MuteMicrophone {
   eventName: "MuteMicrophone";
   targetMuteState: "mute" | "unmute";
+  // the callId posthog key is essentially a Matrix roomId
   callId: string;
 }
 
@@ -156,6 +199,7 @@ export class MuteMicrophoneTracker {
 interface MuteCamera {
   eventName: "MuteCamera";
   targetMuteState: "mute" | "unmute";
+  // the callId posthog key is essentially a Matrix roomId
   callId: string;
 }
 
@@ -171,6 +215,7 @@ export class MuteCameraTracker {
 
 interface UndecryptableToDeviceEvent {
   eventName: "UndecryptableToDeviceEvent";
+  // the callId posthog key is essentially a Matrix roomId
   callId: string;
 }
 
@@ -185,6 +230,7 @@ export class UndecryptableToDeviceEventTracker {
 
 interface QualitySurveyEvent {
   eventName: "QualitySurvey";
+  // the callId posthog key is essentially a Matrix roomId
   callId: string;
   feedbackText: string;
   stars: number;
@@ -249,3 +295,32 @@ export class CallConnectDurationTracker {
       );
   }
 }
+
+export type CallReconnectingReason =
+  | "sync"
+  | "membership"
+  | "probablyLeft"
+  | "livekit";
+
+interface CallReconnecting extends IPosthogEvent {
+  eventName: "CallReconnecting";
+  // the callId posthog key is essentially a Matrix roomId
+  callId: string;
+  reason: CallReconnectingReason;
+  reconnectDuration: number;
+}
+
+export class CallReconnectingTracker {
+  public track(
+    callId: string,
+    reason: CallReconnectingReason,
+    reconnectDuration: number,
+  ): void {
+    PosthogAnalytics.instance.trackEvent<CallReconnecting>({
+      eventName: "CallReconnecting",
+      callId,
+      reason,
+      reconnectDuration,
+    });
+  }
+}

src/state/CallViewModel/CallViewModel.ts

@@ -560,6 +560,7 @@ export function createCallViewModel$(
     connectionManager,
     matrixRTCSession,
     localTransport$,
+    roomId: matrixRoom.roomId,
     logger: logger.getChild(`[${Date.now()}]`),
   });
 

src/state/CallViewModel/localMember/HomeserverConnected.test.ts

@@ -98,108 +98,181 @@ describe("createHomeserverConnected$", () => {
   // LLM generated test cases. They are a bit overkill but I improved the mocking so it is
   // easy enough to read them so I think they can stay.
   // Note: gracePeriodMs is set to 0 to avoid debouncing delays in tests
-  it("is false when sync state is not Syncing", () => {
+  it("reports syncing reason when sync state is not Syncing", () => {
     const hsConnected = createHomeserverConnected$(scope, client, session, 0);
-    expect(hsConnected.combined$.value).toBe(false);
+    expect(hsConnected.combined$.value).toEqual([false, "sync"]);
   });
 
-  it("remains false while membership status is not Connected even if sync is Syncing", () => {
+  it("reports membership reason when sync is Syncing but membership is not Connected", () => {
     const hsConnected = createHomeserverConnected$(scope, client, session, 0);
     client.setSyncState(SyncState.Syncing);
-    expect(hsConnected.combined$.value).toBe(false); // membership still disconnected
+    expect(hsConnected.combined$.value).toEqual([false, "membership"]);
   });
 
-  it("is false when membership status transitions to Connected but ProbablyLeft is true", () => {
+  it("reports probablyLeft reason when membership transitions to Connected but ProbablyLeft is true", () => {
     const hsConnected = createHomeserverConnected$(scope, client, session, 0);
     // Make sync loop OK
     client.setSyncState(SyncState.Syncing);
     // Indicate probable leave before connection
     session.setProbablyLeft(true);
     session.setMembershipStatus(Status.Connected);
-    expect(hsConnected.combined$.value).toBe(false);
+    expect(hsConnected.combined$.value).toEqual([false, "probablyLeft"]);
   });
 
-  it("becomes true only when all three conditions are satisfied", () => {
+  it("becomes null (connected) only when all three conditions are satisfied", () => {
     const hsConnected = createHomeserverConnected$(scope, client, session, 0);
     // 1. Sync loop connected
     client.setSyncState(SyncState.Syncing);
-    expect(hsConnected.combined$.value).toBe(false); // not yet membership connected
+    expect(hsConnected.combined$.value).toEqual([false, "membership"]); // not yet membership connected
     // 2. Membership connected
     session.setMembershipStatus(Status.Connected);
-    expect(hsConnected.combined$.value).toBe(true); // probablyLeft is false
+    expect(hsConnected.combined$.value).toEqual([true, null]); // probablyLeft is false
   });
 
-  it("drops back to false when sync loop leaves Syncing", () => {
+  it("returns syncing reason when sync loop leaves Syncing", () => {
     const hsConnected = createHomeserverConnected$(scope, client, session, 0);
     // Reach connected state
     client.setSyncState(SyncState.Syncing);
     session.setMembershipStatus(Status.Connected);
-    expect(hsConnected.combined$.value).toBe(true);
+    expect(hsConnected.combined$.value).toEqual([true, null]);
 
-    // Sync loop error => should flip false
+    // Sync loop error => should report syncing reason
     client.setSyncState(SyncState.Error);
-    expect(hsConnected.combined$.value).toBe(false);
+    expect(hsConnected.combined$.value).toEqual([false, "sync"]);
   });
 
-  it("drops back to false when membership status becomes disconnected", () => {
+  it("returns membershipConnected reason when membership status becomes disconnected", () => {
     const hsConnected = createHomeserverConnected$(scope, client, session, 0);
     client.setSyncState(SyncState.Syncing);
     session.setMembershipStatus(Status.Connected);
-    expect(hsConnected.combined$.value).toBe(true);
+    expect(hsConnected.combined$.value).toEqual([true, null]);
 
     session.setMembershipStatus(Status.Disconnected);
-    expect(hsConnected.combined$.value).toBe(false);
+    expect(hsConnected.combined$.value).toEqual([false, "membership"]);
   });
 
-  it("drops to false when ProbablyLeft is emitted after being true", () => {
+  it("returns certainlyConnected reason when ProbablyLeft is emitted", () => {
     const hsConnected = createHomeserverConnected$(scope, client, session, 0);
     client.setSyncState(SyncState.Syncing);
     session.setMembershipStatus(Status.Connected);
-    expect(hsConnected.combined$.value).toBe(true);
+    expect(hsConnected.combined$.value).toEqual([true, null]);
 
     session.setProbablyLeft(true);
-    expect(hsConnected.combined$.value).toBe(false);
+    expect(hsConnected.combined$.value).toEqual([false, "probablyLeft"]);
   });
 
-  it("recovers to true if ProbablyLeft becomes false again while other conditions remain true", () => {
+  it("recovers to null (connected) if ProbablyLeft becomes false again while other conditions remain true", () => {
     const hsConnected = createHomeserverConnected$(scope, client, session, 0);
     client.setSyncState(SyncState.Syncing);
     session.setMembershipStatus(Status.Connected);
-    expect(hsConnected.combined$.value).toBe(true);
+    expect(hsConnected.combined$.value).toEqual([true, null]);
 
     session.setProbablyLeft(true);
-    expect(hsConnected.combined$.value).toBe(false);
+    expect(hsConnected.combined$.value).toEqual([false, "probablyLeft"]);
 
     // Simulate clearing the flag (in realistic scenario membership manager would update)
     session.setProbablyLeft(false);
-    expect(hsConnected.combined$.value).toBe(true);
+    expect(hsConnected.combined$.value).toEqual([true, null]);
   });
 
   it("composite sequence reflects each individual failure reason", () => {
     const hsConnected = createHomeserverConnected$(scope, client, session, 0);
 
-    // Initially false (sync error + disconnected + not probably left)
+    // Initially: sync error + membership disconnected → syncing wins (highest priority)
-    expect(hsConnected.combined$.value).toBe(false);
+    expect(hsConnected.combined$.value).toEqual([false, "sync"]);
 
-    // Fix sync only
+    // Fix sync only → membershipConnected is now the blocker
     client.setSyncState(SyncState.Syncing);
-    expect(hsConnected.combined$.value).toBe(false);
+    expect(hsConnected.combined$.value).toEqual([false, "membership"]);
 
-    // Fix membership
+    // Fix membership → all conditions satisfied
     session.setMembershipStatus(Status.Connected);
-    expect(hsConnected.combined$.value).toBe(true);
+    expect(hsConnected.combined$.value).toEqual([true, null]);
 
-    // Introduce probablyLeft -> false
+    // Introduce probablyLeft → certainlyConnected
     session.setProbablyLeft(true);
-    expect(hsConnected.combined$.value).toBe(false);
+    expect(hsConnected.combined$.value).toEqual([false, "probablyLeft"]);
 
-    // Restore notProbablyLeft -> true again
+    // Restore notProbablyLeft → connected again
     session.setProbablyLeft(false);
-    expect(hsConnected.combined$.value).toBe(true);
+    expect(hsConnected.combined$.value).toEqual([true, null]);
 
-    // Drop sync -> false
+    // Drop sync → syncing reason
     client.setSyncState(SyncState.Error);
-    expect(hsConnected.combined$.value).toBe(false);
+    expect(hsConnected.combined$.value).toEqual([false, "sync"]);
+  });
+});
+
+describe("createHomeserverConnected$ - combined$ reason values", () => {
+  let scope: ObservableScope;
+  let client: MockMatrixClient;
+  let session: MockMatrixRTCSession;
+
+  beforeEach(() => {
+    scope = new ObservableScope();
+    // Start with sync failing and membership disconnected
+    client = new MockMatrixClient(SyncState.Error);
+    session = new MockMatrixRTCSession({
+      membershipStatus: Status.Disconnected,
+      probablyLeft: false,
+    });
+  });
+
+  afterEach(() => {
+    scope.end();
+  });
+
+  it("is [true, null] when all three conditions are satisfied", () => {
+    const { combined$ } = createHomeserverConnected$(scope, client, session, 0);
+    client.setSyncState(SyncState.Syncing);
+    session.setMembershipStatus(Status.Connected);
+    expect(combined$.value).toEqual([true, null]);
+  });
+
+  it("reports syncing when sync loop is not Syncing", () => {
+    const { combined$ } = createHomeserverConnected$(scope, client, session, 0);
+    // client starts with SyncState.Error, membership also disconnected
+    expect(combined$.value).toEqual([false, "sync"]);
+  });
+
+  it("reports membershipConnected when sync is fine but membership is not Connected", () => {
+    const { combined$ } = createHomeserverConnected$(scope, client, session, 0);
+    client.setSyncState(SyncState.Syncing);
+    // session still Status.Disconnected
+    expect(combined$.value).toEqual([false, "membership"]);
+  });
+
+  it("reports certainlyConnected when probablyLeft is true", () => {
+    const { combined$ } = createHomeserverConnected$(scope, client, session, 0);
+    client.setSyncState(SyncState.Syncing);
+    session.setMembershipStatus(Status.Connected);
+    session.setProbablyLeft(true);
+    expect(combined$.value).toEqual([false, "probablyLeft"]);
+  });
+
+  it("prioritises syncing over membershipConnected when both fail", () => {
+    const { combined$ } = createHomeserverConnected$(scope, client, session, 0);
+    // Both sync (Error) and membership (Disconnected) are failing
+    expect(combined$.value).toEqual([false, "sync"]);
+  });
+
+  it("updates reason as conditions change", () => {
+    const { combined$ } = createHomeserverConnected$(scope, client, session, 0);
+    // Initially: syncing fails
+    expect(combined$.value).toEqual([false, "sync"]);
+
+    // Fix sync → membershipConnected is now the blocker
+    client.setSyncState(SyncState.Syncing);
+    expect(combined$.value).toEqual([false, "membership"]);
+
+    // Fix membership → probablyLeft makes certainlyConnected fail
+    session.setProbablyLeft(true);
+    session.setMembershipStatus(Status.Connected);
+    expect(combined$.value).toEqual([false, "probablyLeft"]);
+
+    // Clear probablyLeft → all conditions satisfied
+    session.setProbablyLeft(false);
+    expect(combined$.value).toEqual([true, null]);
   });
 });
 
@@ -231,8 +304,8 @@ describe("createHomeserverConnected$ - Grace Period", () => {
         GRACE_PERIOD,
       );
       expectObservable(hsConnected.combined$).toBe(expectedConnectedMarbles, {
-        y: true,
+        y: [true, null],
-        n: false,
+        n: [false, "sync"],
       });
     });
   }

src/state/CallViewModel/localMember/HomeserverConnected.ts

@@ -22,13 +22,13 @@ import {
   switchMap,
   of,
   delay,
+  combineLatest,
 } from "rxjs";
 import { logger as rootLogger } from "matrix-js-sdk/lib/logger";
 
 import { Config } from "../../../config/Config";
 import { type ObservableScope } from "../../ObservableScope";
 import { type Behavior } from "../../Behavior";
-import { and$ } from "../../../utils/observable";
 import { type NodeStyleEventEmitter } from "../../../utils/test";
 
 /**
@@ -36,8 +36,14 @@ import { type NodeStyleEventEmitter } from "../../../utils/test";
  */
 const logger = rootLogger.getChild("[HomeserverConnected]");
 
+export type HomeserverDisconnectReason = "sync" | "membership" | "probablyLeft";
+
 export interface HomeserverConnected {
-  combined$: Behavior<boolean>;
+  /**
+   * Emits `[true, null]` when the homeserver connection is healthy, or
+   * `[false, reason]` when one of the three sub-conditions fails.
+   */
+  combined$: Behavior<[boolean, HomeserverDisconnectReason | null]>;
   rtsSession$: Behavior<Status>;
 }
 
@@ -45,10 +51,11 @@ export interface HomeserverConnected {
  * Behavior representing whether we consider ourselves connected to the Matrix homeserver
  * for the purposes of a MatrixRTC session.
  *
- * Becomes FALSE if ANY sub-condition is fulfilled:
+ * `combined$` emits `null` when all conditions are satisfied, or the first failing
- * 1. Sync loop is not in SyncState.Syncing (after grace period)
+ * reason (priority: syncing > membershipConnected > certainlyConnected):
- * 2. membershipStatus !== Status.Connected
+ * 1. Sync loop is not in SyncState.Syncing (after grace period) → "sync"
- * 3. probablyLeft === true
+ * 2. membershipStatus !== Status.Connected → "membership"
+ * 3. probablyLeft === true → "probablyLeft"
  *
  * @param scope - The observable scope for lifecycle management.
  * @param client - The Matrix client to monitor sync state.
@@ -109,9 +116,22 @@ export function createHomeserverConnected$(
   );
 
   const combined$ = scope.behavior(
-    and$(syncing$, membershipConnected$, certainlyConnected$).pipe(
+    combineLatest([syncing$, membershipConnected$, certainlyConnected$]).pipe(
-      tap((connected) => {
+      map(
-        logger.info(`Homeserver connected update: ${connected}`);
+        ([syncing, membership, certainly]): [
+          boolean,
+          HomeserverDisconnectReason | null,
+        ] => {
+          if (!syncing) return [false, "sync"];
+          if (!membership) return [false, "membership"];
+          if (!certainly) return [false, "probablyLeft"];
+          return [true, null];
+        },
+      ),
+      tap(([connected, reason]) => {
+        logger.info(
+          `Homeserver connected update: ${connected ? "connected" : reason}`,
+        );
       }),
     ),
   );

src/state/CallViewModel/localMember/LocalMember.test.ts

@@ -11,13 +11,23 @@ import {
   type LivekitTransportConfig,
   type MatrixRTCSession,
 } from "matrix-js-sdk/lib/matrixrtc";
-import { describe, expect, it, vi } from "vitest";
+import {
+  describe,
+  expect,
+  it,
+  vi,
+  beforeAll,
+  afterAll,
+  beforeEach,
+} from "vitest";
 import { AutoDiscovery } from "matrix-js-sdk/lib/autodiscovery";
 import { BehaviorSubject, map, of } from "rxjs";
 import { logger } from "matrix-js-sdk/lib/logger";
 import { type LocalParticipant, type LocalTrack } from "livekit-client";
 
+import { PosthogAnalytics } from "../../../analytics/PosthogAnalytics";
 import { MatrixRTCMode } from "../../../settings/settings";
+import { type HomeserverDisconnectReason } from "./HomeserverConnected";
 import {
   flushPromises,
   mockConfig,
@@ -215,9 +225,13 @@ describe("LocalMembership", () => {
     createPublisherFactory: vi.fn(),
     joinMatrixRTC: async (): Promise<void> => {},
     homeserverConnected: {
-      combined$: constant(true),
+      combined$: constant<[boolean, HomeserverDisconnectReason | null]>([
+        true,
+        null,
+      ]),
       rtsSession$: constant(RTCMemberStatus.Connected),
     },
+    roomId: "!test-room-id:example.org",
   };
 
   it("throws error on missing RTC config error", () => {
@@ -667,4 +681,210 @@ describe("LocalMembership", () => {
     // expect(publishers[0].stopTracks).toHaveBeenCalled();
   });
   // TODO add tests for matrix local matrix participation.
+
+  describe("reconnecting analytics", () => {
+    beforeAll(() => {
+      mockConfig();
+    });
+
+    beforeEach(() => {
+      vi.restoreAllMocks();
+    });
+
+    afterAll(() => {
+      PosthogAnalytics.resetInstance();
+    });
+
+    it("does not fire CallReconnecting for the initial non-connected state at startup", async () => {
+      const scope = new ObservableScope();
+      const trackSpy = vi.spyOn(
+        PosthogAnalytics.instance.eventCallReconnecting,
+        "track",
+      );
+
+      // Simulate startup where membership isn't established yet
+      const hsReason$ = new BehaviorSubject<
+        [boolean, HomeserverDisconnectReason | null]
+      >([false, "membership"]);
+
+      const connectionManagerData = new ConnectionManagerData();
+      connectionManagerData.add(connectionTransportAConnected, []);
+
+      createLocalMembership$({
+        scope,
+        ...defaultCreateLocalMemberValues,
+        homeserverConnected: {
+          combined$: hsReason$,
+          rtsSession$: constant(RTCMemberStatus.Connected),
+        },
+        connectionManager: {
+          connectionManagerData$: constant(new Epoch(connectionManagerData)),
+        },
+        localTransport$: new BehaviorSubject({
+          advertised$: new BehaviorSubject(aTransport),
+          active$: new BehaviorSubject(aTransportWithSFUConfig),
+        }),
+      });
+
+      await flushPromises();
+
+      // Membership is established — call is now connected
+      hsReason$.next([true, null]);
+
+      expect(trackSpy).not.toHaveBeenCalled();
+
+      scope.end();
+    });
+
+    it("fires CallReconnecting with homeserver reason and duration when reconnected", async () => {
+      const scope = new ObservableScope();
+      const trackSpy = vi.spyOn(
+        PosthogAnalytics.instance.eventCallReconnecting,
+        "track",
+      );
+
+      const hsReason$ = new BehaviorSubject<
+        [boolean, HomeserverDisconnectReason | null]
+      >([true, null]);
+
+      const connectionManagerData = new ConnectionManagerData();
+      connectionManagerData.add(connectionTransportAConnected, []);
+
+      createLocalMembership$({
+        scope,
+        ...defaultCreateLocalMemberValues,
+        homeserverConnected: {
+          combined$: hsReason$,
+          rtsSession$: constant(RTCMemberStatus.Connected),
+        },
+        connectionManager: {
+          connectionManagerData$: constant(new Epoch(connectionManagerData)),
+        },
+        localTransport$: new BehaviorSubject({
+          advertised$: new BehaviorSubject(aTransport),
+          active$: new BehaviorSubject(aTransportWithSFUConfig),
+        }),
+      });
+
+      await flushPromises();
+
+      hsReason$.next([false, "sync"]);
+      hsReason$.next([true, null]);
+
+      expect(trackSpy).toHaveBeenCalledWith(
+        defaultCreateLocalMemberValues.roomId,
+        "sync",
+        expect.any(Number),
+      );
+
+      scope.end();
+    });
+
+    it("reports livekit reason when livekit disconnects then reconnects", async () => {
+      const scope = new ObservableScope();
+      const trackSpy = vi.spyOn(
+        PosthogAnalytics.instance.eventCallReconnecting,
+        "track",
+      );
+
+      const connectionState$ = new BehaviorSubject<ConnectionState>(
+        ConnectionState.LivekitConnected,
+      );
+      const mutableConnection = {
+        ...connectionTransportAConnected,
+        state$: connectionState$,
+      } as unknown as Connection;
+
+      const connectionManagerData = new ConnectionManagerData();
+      connectionManagerData.add(mutableConnection, []);
+
+      createLocalMembership$({
+        scope,
+        ...defaultCreateLocalMemberValues,
+        homeserverConnected: {
+          combined$: new BehaviorSubject<
+            [boolean, HomeserverDisconnectReason | null]
+          >([true, null]),
+          rtsSession$: constant(RTCMemberStatus.Connected),
+        },
+        connectionManager: {
+          connectionManagerData$: constant(new Epoch(connectionManagerData)),
+        },
+        localTransport$: new BehaviorSubject({
+          advertised$: new BehaviorSubject(aTransport),
+          active$: new BehaviorSubject(aTransportWithSFUConfig),
+        }),
+      });
+
+      await flushPromises();
+
+      connectionState$.next(ConnectionState.LivekitDisconnected);
+      connectionState$.next(ConnectionState.LivekitConnected);
+
+      expect(trackSpy).toHaveBeenCalledWith(
+        defaultCreateLocalMemberValues.roomId,
+        "livekit",
+        expect.any(Number),
+      );
+
+      scope.end();
+    });
+
+    it("fires one event per completed reconnection cycle", async () => {
+      const scope = new ObservableScope();
+      const trackSpy = vi.spyOn(
+        PosthogAnalytics.instance.eventCallReconnecting,
+        "track",
+      );
+
+      const hsReason$ = new BehaviorSubject<
+        [boolean, HomeserverDisconnectReason | null]
+      >([true, null]);
+
+      const connectionManagerData = new ConnectionManagerData();
+      connectionManagerData.add(connectionTransportAConnected, []);
+
+      createLocalMembership$({
+        scope,
+        ...defaultCreateLocalMemberValues,
+        homeserverConnected: {
+          combined$: hsReason$,
+          rtsSession$: constant(RTCMemberStatus.Connected),
+        },
+        connectionManager: {
+          connectionManagerData$: constant(new Epoch(connectionManagerData)),
+        },
+        localTransport$: new BehaviorSubject({
+          advertised$: new BehaviorSubject(aTransport),
+          active$: new BehaviorSubject(aTransportWithSFUConfig),
+        }),
+      });
+
+      await flushPromises();
+
+      hsReason$.next([false, "membership"]);
+      hsReason$.next([true, null]);
+
+      hsReason$.next([false, "probablyLeft"]);
+      hsReason$.next([false, "sync"]);
+      hsReason$.next([false, "membership"]);
+      hsReason$.next([true, null]);
+
+      expect(trackSpy).toHaveBeenCalledTimes(2);
+      expect(trackSpy).toHaveBeenNthCalledWith(
+        1,
+        defaultCreateLocalMemberValues.roomId,
+        "membership",
+        expect.any(Number),
+      );
+      expect(trackSpy).toHaveBeenNthCalledWith(
+        2,
+        defaultCreateLocalMemberValues.roomId,
+        "probablyLeft",
+        expect.any(Number),
+      );
+
+      scope.end();
+    });
+  });
 });

src/state/CallViewModel/localMember/LocalMember.ts

@@ -61,7 +61,6 @@ import {
   type FailedToStartError,
 } from "../remoteMembers/Connection.ts";
 import { type HomeserverConnected } from "./HomeserverConnected.ts";
-import { and$ } from "../../../utils/observable.ts";
 import { type LocalTransport } from "./LocalTransport.ts";
 import { areLivekitTransportsEqual } from "../remoteMembers/MatrixLivekitMembers.ts";
 
@@ -129,6 +128,7 @@ interface Props {
   createPublisherFactory: (connection: Connection) => Publisher;
   joinMatrixRTC: (transport: LivekitTransportConfig) => void;
   homeserverConnected: HomeserverConnected;
+  roomId: string;
   localTransport$: Behavior<LocalTransport>;
   matrixRTCSession: Pick<
     MatrixRTCSession,
@@ -152,6 +152,7 @@ interface Props {
  * @param props.logger The logger to use.
  * @param props.muteStates The mute states for video and audio.
  * @param props.matrixRTCSession The matrix RTC session to join.
+ * @param props.roomId The room ID used as the call identifier in analytics events.
  * @returns
  *  - publisher: The handle to create tracks and publish them to the room.
  *  - connected$: the current connection state. Including matrix server and livekit server connection. (only considering the livekit server we are using for our own media publication)
@@ -169,6 +170,7 @@ export const createLocalMembership$ = ({
   logger: parentLogger,
   muteStates,
   matrixRTCSession,
+  roomId: roomId,
 }: Props): {
   /**
    * This request to start audio and video tracks.
@@ -494,20 +496,35 @@ export const createLocalMembership$ = ({
   );
 
   /**
-   * Whether we are "fully" connected to the call. Accounts for both the
+   * The disconnect reason for the combined Matrix + LiveKit connection, or null
-   * connection to the MatrixRTC session and the LiveKit publish connection.
+   * when fully connected. Homeserver reasons take priority over livekit.
+   * Both connectivity state and reason come from the same combineLatest emission,
+   * avoiding any race between the two.
    */
-  const matrixAndLivekitConnected$ = scope.behavior(
+  const connectionDisconnectReason$ = scope.behavior(
-    and$(
+    combineLatest([
       homeserverConnected.combined$,
       localConnectionState$.pipe(
         map((state) => state === ConnectionState.LivekitConnected),
       ),
-    ).pipe(
+    ]).pipe(
+      map(([[hsConnected, hsReason], livekitConnected]) => {
+        if (!hsConnected) return hsReason!;
+        if (!livekitConnected) return "livekit" as const;
+        return null;
+      }),
       tap((v) => logger.debug("livekit+matrix: Connected state changed", v)),
     ),
   );
 
+  /**
+   * Whether we are "fully" connected to the call. Accounts for both the
+   * connection to the MatrixRTC session and the LiveKit publish connection.
+   */
+  const matrixAndLivekitConnected$ = scope.behavior(
+    connectionDisconnectReason$.pipe(map((reason) => reason === null)),
+  );
+
   /**
    * Whether we should tell the user that we're reconnecting to the call.
    */
@@ -519,6 +536,33 @@ export const createLocalMembership$ = ({
     false,
   );
 
+  let reconnectStart: {
+    time: number;
+    reason: NonNullable<(typeof connectionDisconnectReason$)["value"]>;
+  } | null = null;
+  connectionDisconnectReason$
+    .pipe(distinctUntilChanged(), pairwise(), scope.bind())
+    .subscribe(([prev, reason]) => {
+      if (reason !== null) {
+        // Only begin tracking when transitioning FROM connected (null → non-null).
+        // This prevents the initial startup phase — where we may be non-null before
+        // the first real connection — from being counted as a reconnect.
+        if (prev === null) {
+          reconnectStart ??= { time: Date.now(), reason };
+        }
+      } else if (reconnectStart !== null) {
+        PosthogAnalytics.instance.eventCallReconnecting.track(
+          roomId,
+          reconnectStart.reason,
+          (Date.now() - reconnectStart.time) / 1000,
+        );
+        PosthogAnalytics.instance.eventCallEnded.cacheReconnecting(
+          reconnectStart.reason,
+        );
+        reconnectStart = null;
+      }
+    });
+
   // inform the widget about the connect and disconnect intent from the user.
   scope
     .behavior(joinAndPublishRequested$.pipe(pairwise(), scope.bind()), [
@@ -606,7 +650,7 @@ export const createLocalMembership$ = ({
   // TODO refactor this based no livekitState$
   combineLatest([participant$, homeserverConnected.combined$])
     .pipe(scope.bind())
-    .subscribe(([participant, connected]) => {
+    .subscribe(([participant, [connected]]) => {
       if (!participant) return;
       const publications = participant.trackPublications.values();
       if (connected) {

src/utils/observable.ts

@@ -116,6 +116,8 @@ export function getValue<T>(state$: Observable<T>): T {
 /**
  * Creates an Observable that has a value of true whenever all its inputs are
  * true.
+ *
+ * @public
  */
 export function and$(...inputs: Observable<boolean>[]): Observable<boolean> {
   return combineLatest(inputs, (...flags) => flags.every((flag) => flag));