diff --git a/libmetricslogger/OWNERS b/libmetricslogger/OWNERS
index 7fe0443..6a6fba2 100644
--- a/libmetricslogger/OWNERS
+++ b/libmetricslogger/OWNERS
@@ -1 +1,2 @@
+cwren@google.com
 jhawkins@google.com
diff --git a/libmetricslogger/include/metricslogger/metrics_logger.h b/libmetricslogger/include/metricslogger/metrics_logger.h
index 860d71d..c305db2 100644
--- a/libmetricslogger/include/metricslogger/metrics_logger.h
+++ b/libmetricslogger/include/metricslogger/metrics_logger.h
@@ -77,10 +77,44 @@
     ACTION_BOOT = 1098,
     FIELD_PLATFORM_REASON = 1099,
 
+    FIELD_DURATION_MILLIS = 1304,
+
+    FIELD_END_BATTERY_PERCENT = 1308,
+
     ACTION_HIDDEN_API_ACCESSED = 1391,
     FIELD_HIDDEN_API_ACCESS_METHOD = 1392,
     FIELD_HIDDEN_API_ACCESS_DENIED = 1393,
     FIELD_HIDDEN_API_SIGNATURE = 1394,
+
+    ACTION_USB_CONNECTOR_CONNECTED = 1422,
+    ACTION_USB_CONNECTOR_DISCONNECTED = 1423,
+    ACTION_USB_AUDIO_CONNECTED = 1424,
+    FIELD_USB_AUDIO_VIDPID = 1425,
+    ACTION_USB_AUDIO_DISCONNECTED = 1426,
+    ACTION_HARDWARE_FAILED = 1427,
+    FIELD_HARDWARE_TYPE = 1428,
+    FIELD_HARDWARE_FAILURE_CODE = 1429,
+    ACTION_PHYSICAL_DROP = 1430,
+    FIELD_CONFIDENCE_PERCENT = 1431,
+    FIELD_ACCEL_MILLI_G = 1432,
+    ACTION_BATTERY_HEALTH = 1433,
+    FIELD_BATTERY_HEALTH_SNAPSHOT_TYPE = 1434,
+    FIELD_BATTERY_TEMPERATURE_DECI_C = 1435,
+    FIELD_BATTERY_VOLTAGE_UV = 1436,
+    FIELD_BATTERY_OPEN_CIRCUIT_VOLTAGE_UV = 1437,
+    ACTION_BATTERY_CHARGE_CYCLES = 1438,
+    FIELD_BATTERY_CHARGE_CYCLES = 1439,
+
+    ACTION_SLOW_IO = 1442,
+    FIELD_IO_OPERATION_TYPE = 1443,
+    FIELD_IO_OPERATION_COUNT = 1444,
+    ACTION_SPEAKER_IMPEDANCE = 1445,
+    FIELD_SPEAKER_IMPEDANCE_MILLIOHMS = 1446,
+    FIELD_SPEAKER_LOCATION = 1447,
+    FIELD_BATTERY_RESISTANCE_UOHMS = 1448,
+    FIELD_BATTERY_CURRENT_UA = 1449,
+    FIELD_HARDWARE_LOCATION = 1450,
+    ACTION_BATTERY_CAUSED_SHUTDOWN = 1441,
 };
 
 enum {
@@ -94,5 +128,30 @@
     ACCESS_METHOD_LINKING = 3,
 };
 
+enum HardwareType {
+    HARDWARE_UNKNOWN = 0,
+    HARDWARE_MICROPHONE = 1,
+    HARDWARE_CODEC = 2,
+    HARDWARE_SPEAKER = 3,
+    HARDWARE_FINGERPRINT = 4,
+};
+
+enum HardwareFailureCode {
+    HARDWARE_FAILURE_UNKNOWN = 0,
+    HARDWARE_FAILURE_COMPLETE = 1,
+    HARDWARE_FAILURE_SPEAKER_HIGH_Z = 2,
+    HARDWARE_FAILURE_SPEAKER_SHORT = 3,
+    HARDWARE_FAILURE_FINGERPRINT_SENSOR_BROKEN = 4,
+    HARDWARE_FAILURE_FINGERPRINT_TOO_MANY_DEAD_PIXELS = 5,
+};
+
+enum IoOperation {
+    IOOP_UNKNOWN = 0,
+    IOOP_READ = 1,
+    IOOP_WRITE = 2,
+    IOOP_UNMAP = 3,
+    IOOP_SYNC = 4,
+};
+
 }  // namespace metricslogger
 }  // namespace android
diff --git a/libprocessgroup/processgroup.cpp b/libprocessgroup/processgroup.cpp
index 6dfa697..58295fa 100644
--- a/libprocessgroup/processgroup.cpp
+++ b/libprocessgroup/processgroup.cpp
@@ -39,12 +39,18 @@
 
 #include <android-base/file.h>
 #include <android-base/logging.h>
+#ifdef __ANDROID__
+#include <android-base/properties.h>
+#endif
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
 #include <private/android_filesystem_config.h>
 
 #include <processgroup/processgroup.h>
 
+#ifdef __ANDROID__
+using android::base::GetBoolProperty;
+#endif
 using android::base::StartsWith;
 using android::base::StringPrintf;
 using android::base::WriteStringToFile;
@@ -62,12 +68,25 @@
 static const std::string& GetCgroupRootPath() {
     static std::string cgroup_root_path;
     std::call_once(init_path_flag, [&]() {
-            // Check if mem cgroup is mounted, only then check for write-access to avoid
-            // SELinux denials
+#ifdef __ANDROID__
+        // low-ram devices use per-app memcg by default, unlike high-end ones
+        bool low_ram_device = GetBoolProperty("ro.config.low_ram", false);
+        bool per_app_memcg =
+            GetBoolProperty("ro.config.per_app_memcg", low_ram_device);
+#else
+        // host does not support Android properties
+        bool per_app_memcg = false;
+#endif
+        if (per_app_memcg) {
+            // Check if mem cgroup is mounted, only then check for
+            // write-access to avoid SELinux denials
             cgroup_root_path =
-                (access(MEM_CGROUP_TASKS, F_OK) || access(MEM_CGROUP_PATH, W_OK) ? ACCT_CGROUP_PATH
-                                                                                 : MEM_CGROUP_PATH);
-            });
+                (access(MEM_CGROUP_TASKS, F_OK) || access(MEM_CGROUP_PATH, W_OK) ?
+                ACCT_CGROUP_PATH : MEM_CGROUP_PATH);
+        } else {
+            cgroup_root_path = ACCT_CGROUP_PATH;
+        }
+    });
     return cgroup_root_path;
 }