diff --git a/proto/src/metrics_constants.proto b/proto/src/metrics_constants.proto
index 81a23f0..cbd2f75 100644
--- a/proto/src/metrics_constants.proto
+++ b/proto/src/metrics_constants.proto
@@ -4567,6 +4567,10 @@
     // OS: O MR
     COLOR_MODE_SETTINGS = 1143;
 
+    // Enclosing category for group of APP_TRANSITION_FOO events,
+    // logged when we cancel an app transition.
+    APP_TRANSITION_CANCELLED = 1144;
+
     // ---- End O-MR1 Constants, all O-MR1 constants go above this line ----
 
     // Add new aosp constants above this line.
diff --git a/services/core/java/com/android/server/am/ActivityManagerDebugConfig.java b/services/core/java/com/android/server/am/ActivityManagerDebugConfig.java
index 3a9bf12..276f0ef 100644
--- a/services/core/java/com/android/server/am/ActivityManagerDebugConfig.java
+++ b/services/core/java/com/android/server/am/ActivityManagerDebugConfig.java
@@ -94,6 +94,7 @@
     static final boolean DEBUG_USAGE_STATS = DEBUG_ALL || false;
     static final boolean DEBUG_PERMISSIONS_REVIEW = DEBUG_ALL || false;
     static final boolean DEBUG_WHITELISTS = DEBUG_ALL || false;
+    static final boolean DEBUG_METRICS = DEBUG_ALL || false;
 
     static final String POSTFIX_ADD_REMOVE = (APPEND_CATEGORY_NAME) ? "_AddRemove" : "";
     static final String POSTFIX_APP = (APPEND_CATEGORY_NAME) ? "_App" : "";
diff --git a/services/core/java/com/android/server/am/ActivityMetricsLogger.java b/services/core/java/com/android/server/am/ActivityMetricsLogger.java
index f396e9e..a803874 100644
--- a/services/core/java/com/android/server/am/ActivityMetricsLogger.java
+++ b/services/core/java/com/android/server/am/ActivityMetricsLogger.java
@@ -12,6 +12,7 @@
 import static com.android.internal.logging.nano.MetricsProto.MetricsEvent.APP_TRANSITION;
 import static com.android.internal.logging.nano.MetricsProto.MetricsEvent.APP_TRANSITION_BIND_APPLICATION_DELAY_MS;
 import static com.android.internal.logging.nano.MetricsProto.MetricsEvent.APP_TRANSITION_CALLING_PACKAGE_NAME;
+import static com.android.internal.logging.nano.MetricsProto.MetricsEvent.APP_TRANSITION_CANCELLED;
 import static com.android.internal.logging.nano.MetricsProto.MetricsEvent.APP_TRANSITION_DELAY_MS;
 import static com.android.internal.logging.nano.MetricsProto.MetricsEvent.APP_TRANSITION_DEVICE_UPTIME_SECONDS;
 import static com.android.internal.logging.nano.MetricsProto.MetricsEvent.APP_TRANSITION_IS_EPHEMERAL;
@@ -27,6 +28,7 @@
 import static com.android.internal.logging.nano.MetricsProto.MetricsEvent.TYPE_TRANSITION_REPORTED_DRAWN_NO_BUNDLE;
 import static com.android.internal.logging.nano.MetricsProto.MetricsEvent.TYPE_TRANSITION_REPORTED_DRAWN_WITH_BUNDLE;
 import static com.android.internal.logging.nano.MetricsProto.MetricsEvent.TYPE_TRANSITION_WARM_LAUNCH;
+import static com.android.server.am.ActivityManagerDebugConfig.DEBUG_METRICS;
 import static com.android.server.am.ActivityManagerDebugConfig.TAG_AM;
 import static com.android.server.am.ActivityManagerDebugConfig.TAG_WITH_CLASS_NAME;
 import static com.android.server.am.ActivityStack.STACK_INVISIBLE;
@@ -34,12 +36,16 @@
 import android.app.ActivityManager.StackId;
 import android.content.Context;
 import android.metrics.LogMaker;
+import android.os.Handler;
+import android.os.Looper;
+import android.os.Message;
 import android.os.SystemClock;
 import android.util.Slog;
 import android.util.SparseArray;
 import android.util.SparseIntArray;
 
 import com.android.internal.logging.MetricsLogger;
+import com.android.internal.os.SomeArgs;
 
 import java.util.ArrayList;
 
@@ -60,6 +66,8 @@
 
     private static final long INVALID_START_TIME = -1;
 
+    private static final int MSG_CHECK_VISIBILITY = 0;
+
     // Preallocated strings we are sending to tron, so we don't have to allocate a new one every
     // time we log.
     private static final String[] TRON_WINDOW_STATE_VARZ_STRINGS = {
@@ -80,6 +88,23 @@
 
     private final SparseArray<StackTransitionInfo> mStackTransitionInfo = new SparseArray<>();
     private final SparseArray<StackTransitionInfo> mLastStackTransitionInfo = new SparseArray<>();
+    private final H mHandler;
+    private final class H extends Handler {
+
+        public H(Looper looper) {
+            super(looper);
+        }
+
+        @Override
+        public void handleMessage(Message msg) {
+            switch (msg.what) {
+                case MSG_CHECK_VISIBILITY:
+                    final SomeArgs args = (SomeArgs) msg.obj;
+                    checkVisibility((TaskRecord) args.arg1, (ActivityRecord) args.arg2);
+                    break;
+            }
+        }
+    };
 
     private final class StackTransitionInfo {
         private ActivityRecord launchedActivity;
@@ -93,10 +118,11 @@
         private boolean loggedStartingWindowDrawn;
     }
 
-    ActivityMetricsLogger(ActivityStackSupervisor supervisor, Context context) {
+    ActivityMetricsLogger(ActivityStackSupervisor supervisor, Context context, Looper looper) {
         mLastLogTimeSecs = SystemClock.elapsedRealtime() / 1000;
         mSupervisor = supervisor;
         mContext = context;
+        mHandler = new H(looper);
     }
 
     void logWindowState() {
@@ -142,6 +168,7 @@
      */
     void notifyActivityLaunching() {
         if (!isAnyTransitionActive()) {
+            if (DEBUG_METRICS) Slog.i(TAG, "notifyActivityLaunching");
             mCurrentTransitionStartTime = SystemClock.uptimeMillis();
             mLastTransitionStartTime = mCurrentTransitionStartTime;
         }
@@ -199,6 +226,12 @@
     private void notifyActivityLaunched(int resultCode, ActivityRecord launchedActivity,
             boolean processRunning, boolean processSwitch) {
 
+        if (DEBUG_METRICS) Slog.i(TAG, "notifyActivityLaunched"
+                + " resultCode=" + resultCode
+                + " launchedActivity=" + launchedActivity
+                + " processRunning=" + processRunning
+                + " processSwitch=" + processSwitch);
+
         // If we are already in an existing transition, only update the activity name, but not the
         // other attributes.
         final int stackId = launchedActivity != null && launchedActivity.getStack() != null
@@ -227,6 +260,8 @@
             return;
         }
 
+        if (DEBUG_METRICS) Slog.i(TAG, "notifyActivityLaunched successful");
+
         final StackTransitionInfo newInfo = new StackTransitionInfo();
         newInfo.launchedActivity = launchedActivity;
         newInfo.currentTransitionProcessRunning = processRunning;
@@ -240,6 +275,8 @@
      * Notifies the tracker that all windows of the app have been drawn.
      */
     void notifyWindowsDrawn(int stackId, long timestamp) {
+        if (DEBUG_METRICS) Slog.i(TAG, "notifyWindowsDrawn stackId=" + stackId);
+
         final StackTransitionInfo info = mStackTransitionInfo.get(stackId);
         if (info == null || info.loggedWindowsDrawn) {
             return;
@@ -273,6 +310,7 @@
         if (!isAnyTransitionActive() || mLoggedTransitionStarting) {
             return;
         }
+        if (DEBUG_METRICS) Slog.i(TAG, "notifyTransitionStarting");
         mCurrentTransitionDelayMs = calculateDelay(timestamp);
         mLoggedTransitionStarting = true;
         for (int index = stackIdReasons.size() - 1; index >= 0; index--) {
@@ -292,17 +330,37 @@
      * Notifies the tracker that the visibility of an app is changing.
      *
      * @param activityRecord the app that is changing its visibility
-     * @param visible whether it's going to be visible or not
      */
-    void notifyVisibilityChanged(ActivityRecord activityRecord, boolean visible) {
+    void notifyVisibilityChanged(ActivityRecord activityRecord) {
         final StackTransitionInfo info = mStackTransitionInfo.get(activityRecord.getStackId());
+        if (info == null) {
+            return;
+        }
+        if (info.launchedActivity != activityRecord) {
+            return;
+        }
+        final TaskRecord t = activityRecord.getTask();
+        final SomeArgs args = SomeArgs.obtain();
+        args.arg1 = t;
+        args.arg2 = activityRecord;
+        mHandler.obtainMessage(MSG_CHECK_VISIBILITY, args).sendToTarget();
+    }
 
-        // If we have an active transition that's waiting on a certain activity that will be
-        // invisible now, we'll never get onWindowsDrawn, so abort the transition if necessary.
-        if (info != null && !visible && info.launchedActivity == activityRecord) {
-            mStackTransitionInfo.remove(activityRecord.getStackId());
-            if (mStackTransitionInfo.size() == 0) {
-                reset(true /* abort */);
+    private void checkVisibility(TaskRecord t, ActivityRecord r) {
+        synchronized (mSupervisor.mService) {
+
+            final StackTransitionInfo info = mStackTransitionInfo.get(r.getStackId());
+
+            // If we have an active transition that's waiting on a certain activity that will be
+            // invisible now, we'll never get onWindowsDrawn, so abort the transition if necessary.
+            if (info != null && !t.isVisible()) {
+                if (DEBUG_METRICS) Slog.i(TAG, "notifyVisibilityChanged to invisible"
+                        + " activity=" + r);
+                logAppTransitionCancel(info);
+                mStackTransitionInfo.remove(r.getStackId());
+                if (mStackTransitionInfo.size() == 0) {
+                    reset(true /* abort */);
+                }
             }
         }
     }
@@ -338,6 +396,7 @@
     }
 
     private void reset(boolean abort) {
+        if (DEBUG_METRICS) Slog.i(TAG, "reset abort=" + abort);
         if (!abort && isAnyTransitionActive()) {
             logAppTransitionMultiEvents();
         }
@@ -358,7 +417,20 @@
         return (int) (timestamp - mCurrentTransitionStartTime);
     }
 
+    private void logAppTransitionCancel(StackTransitionInfo info) {
+        final int type = getTransitionType(info);
+        if (type == -1) {
+            return;
+        }
+        final LogMaker builder = new LogMaker(APP_TRANSITION_CANCELLED);
+        builder.setPackageName(info.launchedActivity.packageName);
+        builder.setType(type);
+        builder.addTaggedData(FIELD_CLASS_NAME, info.launchedActivity.info.name);
+        mMetricsLogger.write(builder);
+    }
+
     private void logAppTransitionMultiEvents() {
+        if (DEBUG_METRICS) Slog.i(TAG, "logging transition events");
         for (int index = mStackTransitionInfo.size() - 1; index >= 0; index--) {
             final StackTransitionInfo info = mStackTransitionInfo.valueAt(index);
             final int type = getTransitionType(info);
diff --git a/services/core/java/com/android/server/am/ActivityRecord.java b/services/core/java/com/android/server/am/ActivityRecord.java
index 4d98f19..fd44768 100644
--- a/services/core/java/com/android/server/am/ActivityRecord.java
+++ b/services/core/java/com/android/server/am/ActivityRecord.java
@@ -1578,7 +1578,7 @@
 
     void setVisibility(boolean visible) {
         mWindowContainerController.setVisibility(visible, mDeferHidingClient);
-        mStackSupervisor.mActivityMetricsLogger.notifyVisibilityChanged(this, visible);
+        mStackSupervisor.mActivityMetricsLogger.notifyVisibilityChanged(this);
     }
 
     // TODO: Look into merging with #setVisibility()
diff --git a/services/core/java/com/android/server/am/ActivityStackSupervisor.java b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
index b2dc3e6..795d7dd 100644
--- a/services/core/java/com/android/server/am/ActivityStackSupervisor.java
+++ b/services/core/java/com/android/server/am/ActivityStackSupervisor.java
@@ -606,7 +606,7 @@
     public ActivityStackSupervisor(ActivityManagerService service, Looper looper) {
         mService = service;
         mHandler = new ActivityStackSupervisorHandler(looper);
-        mActivityMetricsLogger = new ActivityMetricsLogger(this, mService.mContext);
+        mActivityMetricsLogger = new ActivityMetricsLogger(this, mService.mContext, looper);
         mKeyguardController = new KeyguardController(service, this);
     }
 
@@ -4836,9 +4836,13 @@
                 mService.mActivityStarter.sendPowerHintForLaunchStartIfNeeded(true /* forceSend */,
                         targetActivity);
                 mActivityMetricsLogger.notifyActivityLaunching();
-                mService.moveTaskToFrontLocked(task.taskId, 0, bOptions, true /* fromRecents */);
-                mActivityMetricsLogger.notifyActivityLaunched(ActivityManager.START_TASK_TO_FRONT,
-                        targetActivity);
+                try {
+                    mService.moveTaskToFrontLocked(task.taskId, 0, bOptions,
+                            true /* fromRecents */);
+                } finally {
+                    mActivityMetricsLogger.notifyActivityLaunched(START_TASK_TO_FRONT,
+                            targetActivity);
+                }
 
                 // If we are launching the task in the docked stack, put it into resizing mode so
                 // the window renders full-screen with the background filling the void. Also only
diff --git a/services/core/java/com/android/server/am/TaskRecord.java b/services/core/java/com/android/server/am/TaskRecord.java
index eadc8a6..f833109 100644
--- a/services/core/java/com/android/server/am/TaskRecord.java
+++ b/services/core/java/com/android/server/am/TaskRecord.java
@@ -1151,6 +1151,16 @@
         return null;
     }
 
+    boolean isVisible() {
+        for (int i = mActivities.size() - 1; i >= 0; --i) {
+            final ActivityRecord r = mActivities.get(i);
+            if (r.visible) {
+                return true;
+            }
+        }
+        return false;
+    }
+
     void getAllRunningVisibleActivitiesLocked(ArrayList<ActivityRecord> outActivities) {
         if (mStack != null) {
             for (int activityNdx = mActivities.size() - 1; activityNdx >= 0; --activityNdx) {