[incremental] expose duration metrics to activity manager

Change existing metrics proto to include:
1) whether the crashed/ANR'd app is incremental
2) the loading progress of the crashed/ANR'd app
3) the duration in milliseconds since the oldest pending read

Example logcat:

03-08 11:21:31.405  1668  5779 E ActivityManager: App crashed on incremental package mytown.police which is 81% loaded.

Example crash metrics:
metric_id: 1111
event_metrics {
  data {
    elapsed_timestamp_nanos: 1141413709431
    atom {
      app_crash_occurred {
        uid: 10348
        event_type: "crash"
        process_name: "mytown.police"
        pid: 21236
        package_name: "mytown.police"
        is_instant_app: FALSE
        foreground_state: FOREGROUND
        error_source: DATA_APP
>>>        is_incremental: true
>>>        loading_progress: 0.81358474
>>>        millis_since_oldest_pending_read: 20092
      }
    }
  }
}

BUG: 180951530
Test: atest CtsStatsdAtomHostTestCases:android.cts.statsdatom.statsd.UidAtomTests#testANROccurred
Test: manual with disabled rest streaming
Change-Id: I931acfed37304fa35f756286b424512490b0e312

3 files changed, 65 insertions, 0 deletions

diff --git a/core/java/android/os/incremental/IncrementalManager.java b/core/java/android/os/incremental/IncrementalManager.java
index dc6f63a94685..ccb4a615f44a 100644
--- a/core/java/android/os/incremental/IncrementalManager.java
+++ b/core/java/android/os/incremental/IncrementalManager.java
@@ -421,6 +421,18 @@ public final class IncrementalManager {
         storage.unregisterStorageHealthListener();
     }
 
+    /**
+     * Returns the metrics of an Incremental Storage.
+     */
+    public IncrementalMetrics getMetrics(@NonNull String codePath) {
+        final IncrementalStorage storage = openStorage(codePath);
+        if (storage == null) {
+            // storage does not exist, package not installed
+            return null;
+        }
+        return new IncrementalMetrics(storage.getMetrics());
+    }
+
     /* Native methods */
     private static native boolean nativeIsEnabled();
     private static native boolean nativeIsV2Available();
diff --git a/core/java/android/os/incremental/IncrementalMetrics.java b/core/java/android/os/incremental/IncrementalMetrics.java
new file mode 100644
index 000000000000..44dea1be50f0
--- /dev/null
+++ b/core/java/android/os/incremental/IncrementalMetrics.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.os.incremental;
+
+import android.annotation.NonNull;
+import android.os.PersistableBundle;
+
+/**
+ * Provides methods to access metrics about an app installed via Incremental
+ * @hide
+ */
+public class IncrementalMetrics {
+    @NonNull private final PersistableBundle mData;
+
+    public IncrementalMetrics(@NonNull PersistableBundle data) {
+        mData = data;
+    }
+
+    /**
+     * @return Milliseconds between now and when the oldest pending read happened
+     */
+    public long getMillisSinceOldestPendingRead() {
+        return mData.getLong(IIncrementalService.METRICS_MILLIS_SINCE_OLDEST_PENDING_READ, -1);
+    }
+}
diff --git a/core/java/android/os/incremental/IncrementalStorage.java b/core/java/android/os/incremental/IncrementalStorage.java
index e6ce8cd56d28..7cf0144d71f7 100644
--- a/core/java/android/os/incremental/IncrementalStorage.java
+++ b/core/java/android/os/incremental/IncrementalStorage.java
@@ -20,6 +20,7 @@ import android.annotation.NonNull;
 import android.annotation.Nullable;
 import android.content.pm.DataLoaderParams;
 import android.content.pm.IDataLoaderStatusListener;
+import android.os.PersistableBundle;
 import android.os.RemoteException;
 
 import java.io.File;
@@ -601,4 +602,17 @@ public final class IncrementalStorage {
             return;
         }
     }
+
+    /**
+     * Returns the metrics of the current storage.
+     * {@see IIncrementalService} for metrics keys.
+     */
+    public PersistableBundle getMetrics() {
+        try {
+            return mService.getMetrics(mId);
+        } catch (RemoteException e) {
+            e.rethrowFromSystemServer();
+            return null;
+        }
+    }
 }