cmds/statsd/src/atoms.proto

/*
 * Copyright (C) 2017 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.
 */

syntax = "proto2";

package android.os.statsd;
option java_package = "com.android.os";
option java_outer_classname = "AtomsProto";

import "frameworks/base/cmds/statsd/src/atom_field_options.proto";
import "frameworks/base/core/proto/android/app/enums.proto";
import "frameworks/base/core/proto/android/app/job/enums.proto";
import "frameworks/base/core/proto/android/bluetooth/enums.proto";
import "frameworks/base/core/proto/android/os/enums.proto";
import "frameworks/base/core/proto/android/server/enums.proto";
import "frameworks/base/core/proto/android/telecomm/enums.proto";
import "frameworks/base/core/proto/android/telephony/enums.proto";
import "frameworks/base/core/proto/android/view/enums.proto";
import "frameworks/base/proto/src/stats_enums.proto";
import "frameworks/base/core/proto/android/service/procstats.proto";

/**
 * The master atom class. This message defines all of the available
 * raw stats log events from the Android system, also known as "atoms."
 *
 * This field contains a single oneof with all of the available messages.
 * The stats-log-api-gen tool runs as part of the Android build and
 * generates the android.util.StatsLog class, which contains the constants
 * and methods that Android uses to log.
 *
 * This Atom class is not actually built into the Android system.
 * Instead, statsd on Android constructs these messages synthetically,
 * in the format defined here and in stats_log.proto.
 */
message Atom {
    // Pushed atoms start at 2.
    oneof pushed {
        // For StatsLog reasons, 1 is illegal and will not work. Must start at 2.
        BleScanStateChanged ble_scan_state_changed = 2;
        ProcessStateChanged process_state_changed = 3;
        BleScanResultReceived ble_scan_result_received = 4;
        SensorStateChanged sensor_state_changed = 5;
        GpsScanStateChanged gps_scan_state_changed = 6;
        SyncStateChanged sync_state_changed = 7;
        ScheduledJobStateChanged scheduled_job_state_changed = 8;
        ScreenBrightnessChanged screen_brightness_changed = 9;
        WakelockStateChanged wakelock_state_changed = 10;
        LongPartialWakelockStateChanged long_partial_wakelock_state_changed = 11;
        MobileRadioPowerStateChanged mobile_radio_power_state_changed = 12;
        WifiRadioPowerStateChanged wifi_radio_power_state_changed = 13;
        ActivityManagerSleepStateChanged activity_manager_sleep_state_changed = 14;
        MemoryFactorStateChanged memory_factor_state_changed = 15;
        ExcessiveCpuUsageReported excessive_cpu_usage_reported = 16;
        CachedKillReported cached_kill_reported = 17;
        ProcessMemoryStatReported process_memory_stat_reported = 18;
        // 19 is available
        BatterySaverModeStateChanged battery_saver_mode_state_changed = 20;
        DeviceIdleModeStateChanged device_idle_mode_state_changed = 21;
        DeviceIdlingModeStateChanged device_idling_mode_state_changed = 22;
        AudioStateChanged audio_state_changed = 23;
        MediaCodecStateChanged media_codec_state_changed = 24;
        CameraStateChanged camera_state_changed = 25;
        FlashlightStateChanged flashlight_state_changed = 26;
        UidProcessStateChanged uid_process_state_changed = 27;
        ProcessLifeCycleStateChanged process_life_cycle_state_changed = 28;
        ScreenStateChanged screen_state_changed = 29;
        BatteryLevelChanged battery_level_changed = 30;
        ChargingStateChanged charging_state_changed = 31;
        PluggedStateChanged plugged_state_changed = 32;
        // 33 - 34 are available
        WakeupAlarmOccurred wakeup_alarm_occurred = 35;
        KernelWakeupReported kernel_wakeup_reported = 36;
        WifiLockStateChanged wifi_lock_state_changed = 37;
        WifiSignalStrengthChanged wifi_signal_strength_changed = 38;
        WifiScanStateChanged wifi_scan_state_changed = 39;
        PhoneSignalStrengthChanged phone_signal_strength_changed = 40;
        SettingChanged setting_changed = 41;
        ActivityForegroundStateChanged activity_foreground_state_changed = 42;
        IsolatedUidChanged isolated_uid_changed = 43;
        PacketWakeupOccurred packet_wakeup_occurred = 44;
        // 45 is available
        AnomalyDetected anomaly_detected = 46;
        AppBreadcrumbReported app_breadcrumb_reported = 47;
        AppStartOccurred app_start_occurred = 48;
        AppStartCanceled app_start_canceled = 49;
        AppStartFullyDrawn app_start_fully_drawn = 50;
        LmkKillOccurred lmk_kill_occurred = 51;
        PictureInPictureStateChanged picture_in_picture_state_changed = 52;
        WifiMulticastLockStateChanged wifi_multicast_lock_state_changed = 53;
        LmkStateChanged lmk_state_changed = 54;
        AppStartMemoryStateCaptured app_start_memory_state_captured = 55;
        ShutdownSequenceReported shutdown_sequence_reported = 56;
        BootSequenceReported boot_sequence_reported = 57;
        DaveyOccurred davey_occurred = 58;
        OverlayStateChanged overlay_state_changed = 59;
        ForegroundServiceStateChanged foreground_service_state_changed = 60;
        CallStateChanged call_state_changed = 61;
        KeyguardStateChanged keyguard_state_changed = 62;
        KeyguardBouncerStateChanged keyguard_bouncer_state_changed = 63;
        KeyguardBouncerPasswordEntered keyguard_bouncer_password_entered = 64;
        AppDied app_died = 65;
        ResourceConfigurationChanged resource_configuration_changed = 66;
        BluetoothEnabledStateChanged bluetooth_enabled_state_changed = 67;
        BluetoothConnectionStateChanged bluetooth_connection_state_changed = 68;
        // 69 is blank but need not be.
        UsbConnectorStateChanged usb_connector_state_changed = 70;
        SpeakerImpedanceReported speaker_impedance_reported = 71;
        HardwareFailed hardware_failed = 72;
        PhysicalDropDetected physical_drop_detected = 73;
        ChargeCyclesReported charge_cycles_reported = 74;
        MobileConnectionStateChanged mobile_connection_state_changed = 75;
        MobileRadioTechnologyChanged mobile_radio_technology_changed = 76;
        UsbDeviceAttached usb_device_attached = 77;
        AppCrashOccurred app_crash_occurred = 78;
        ANROccurred anr_occurred = 79;
        WTFOccurred wtf_occurred = 80;
        LowMemReported low_mem_reported = 81;
        GenericAtom generic_atom = 82;
        KeyValuePairsAtom key_value_pairs_atom = 83;
        VibratorStateChanged vibrator_state_changed = 84;
        DeferredJobStatsReported deferred_job_stats_reported = 85;
    }

    // Pulled events will start at field 10000.
    // Next: 10025
    oneof pulled {
        WifiBytesTransfer wifi_bytes_transfer = 10000;
        WifiBytesTransferByFgBg wifi_bytes_transfer_by_fg_bg = 10001;
        MobileBytesTransfer mobile_bytes_transfer = 10002;
        MobileBytesTransferByFgBg mobile_bytes_transfer_by_fg_bg = 10003;
        BluetoothBytesTransfer bluetooth_bytes_transfer = 10006;
        KernelWakelock kernel_wakelock = 10004;
        SubsystemSleepState subsystem_sleep_state = 10005;
        CpuTimePerFreq cpu_time_per_freq = 10008;
        CpuTimePerUid cpu_time_per_uid = 10009;
        CpuTimePerUidFreq cpu_time_per_uid_freq = 10010;
        WifiActivityInfo wifi_activity_info = 10011;
        ModemActivityInfo modem_activity_info = 10012;
        BluetoothActivityInfo bluetooth_activity_info = 10007;
        ProcessMemoryState process_memory_state = 10013;
        SystemElapsedRealtime system_elapsed_realtime = 10014;
        SystemUptime system_uptime = 10015;
        CpuActiveTime cpu_active_time = 10016;
        CpuClusterTime cpu_cluster_time = 10017;
        DiskSpace disk_space = 10018 [deprecated=true];
        RemainingBatteryCapacity remaining_battery_capacity = 10019;
        FullBatteryCapacity full_battery_capacity = 10020;
        Temperature temperature = 10021;
        BinderCalls binder_calls = 10022;
        BinderCallsExceptions binder_calls_exceptions = 10023;
        LooperStats looper_stats = 10024;
        DiskStats disk_stats = 10025;
        DirectoryUsage directory_usage = 10026;
        AppSize app_size = 10027;
        CategorySize category_size = 10028;
        android.service.procstats.ProcessStatsSectionProto proc_stats = 10029;
    }

    // DO NOT USE field numbers above 100,000 in AOSP. Field numbers above
    // 100,000 are reserved for non-AOSP (e.g. OEMs) to use.
}

/**
 * This proto represents a node of an attribution chain.
 * Note: All attribution chains are represented as a repeated field of type
 * AttributionNode. It is understood that in such arrays, the order is that
 * of calls, that is [A, B, C] if A calls B that calls C.
 */
message AttributionNode {
    // The uid for a given element in the attribution chain.
    optional int32 uid = 1;

    // The (optional) string tag for an element in the attribution chain. If the
    // element has no tag, it is encoded as an empty string.
    optional string tag = 2;
}

message KeyValuePair {
    optional int32 key = 1;
    oneof value {
        int64 value_int = 2;
        string value_str = 3;
        float value_float = 4;
    }
}

message KeyValuePairsAtom {
    optional int32 uid = 1;
    repeated KeyValuePair pairs = 2;
}

/*
 * *****************************************************************************
 * Below are all of the individual atoms that are logged by Android via statsd.
 *
 * RULES:
 *   - The field ids for each atom must start at 1, and count upwards by 1.
 *     Skipping field ids is not allowed.
 *   - These form an API, so renaming, renumbering or removing fields is
 *     not allowed between android releases.  (This is not currently enforced,
 *     but there will be a tool to enforce this restriction).
 *   - The types must be built-in protocol buffer types, namely, no sub-messages
 *     are allowed (yet).  The bytes type is also not allowed.
 *   - The CamelCase name of the message type should match the
 *     underscore_separated name as defined in Atom.
 *   - If an atom represents work that can be attributed to an app, there can
 *     be exactly one AttributionChain field. It must be field number 1.
 *   - A field that is a uid should be a string field, tagged with the [xxx]
 *     annotation. The generated code on android will be represented by UIDs,
 *     and those UIDs will be translated in xxx to those strings.
 *
 * CONVENTIONS:
 *   - Events are past tense. e.g. ScreenStateChanged, not ScreenStateChange.
 *   - If there is a UID, it goes first. Think in an object-oriented fashion.
 * *****************************************************************************
 */

/**
 * Logs when the screen state changes.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/BatteryStatsService.java
 */
message ScreenStateChanged {
    // New screen state, from frameworks/base/core/proto/android/view/enums.proto.
    optional android.view.DisplayStateEnum state = 1 [(stateFieldOption).option = EXCLUSIVE];
}

/**
 * Logs that the process state of the uid, as determined by ActivityManager
 * (i.e. the highest process state of that uid's processes) has changed.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/BatteryStatsService.java
 */
message UidProcessStateChanged {
    optional int32 uid = 1 [(stateFieldOption).option = PRIMARY, (is_uid) = true];

    // The state, from frameworks/base/core/proto/android/app/enums.proto.
    optional android.app.ProcessStateEnum state = 2 [(stateFieldOption).option = EXCLUSIVE];
}

/**
 * Logs process state change of a process, as per the activity manager.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/ProcessRecord.java
 */
message ProcessStateChanged {
    optional int32 uid = 1;
    optional string process_name = 2;
    optional string package_name = 3;
    // TODO: remove this when validation is done
    optional int64 version = 5;
    // The state, from frameworks/base/core/proto/android/app/enums.proto.
    optional android.app.ProcessStateEnum state = 4;
}

/**
 * Logs when ActivityManagerService sleep state is changed.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/ActivityTaskManagerService.java
 */
message ActivityManagerSleepStateChanged {
    // TODO: import frameworks proto
    enum State {
        UNKNOWN = 0;
        ASLEEP = 1;
        AWAKE = 2;
    }
    optional State state = 1 [(stateFieldOption).option = EXCLUSIVE];
}

/**
 * Logs when system memory state changes.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
 */
message MemoryFactorStateChanged {
    // TODO: import frameworks proto
    enum State {
        MEMORY_UNKNOWN = 0;
        NORMAL = 1;     // normal.
        MODERATE = 2;   // moderate memory pressure.
        LOW = 3;        // low memory.
        CRITICAL = 4;   // critical memory.

    }
    optional State factor = 1 [(stateFieldOption).option = EXCLUSIVE];
}

/**
 * Logs when app is using too much cpu, according to ActivityManagerService.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
 */
message ExcessiveCpuUsageReported {
    optional int32 uid = 1;
    optional string process_name = 2;
    optional string package_name = 3;
    // package version. TODO: remove this when validation is done
    optional int64 version = 4;
}

/**
 * Logs when a cached process is killed, along with its pss.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
 */
message CachedKillReported {
    optional int32 uid = 1;
    optional string process_name = 2;
    optional string package_name = 3;
    // TODO: remove this when validation is done
    optional int64 version = 5;
    optional int64 pss = 4;
}

/**
 * Logs when memory stats of a process is reported.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/ProcessRecord.java
 */
message ProcessMemoryStatReported {
    optional int32 uid = 1;
    optional string process_name = 2;
    optional string package_name = 3;
    //TODO: remove this when validation is done
    optional int64 version = 9;
    optional int64 pss = 4;
    optional int64 uss = 5;
    optional int64 rss = 6;
    enum Type {
        ADD_PSS_INTERNAL_SINGLE = 0;
        ADD_PSS_INTERNAL_ALL_MEM = 1;
        ADD_PSS_INTERNAL_ALL_POLL = 2;
        ADD_PSS_EXTERNAL = 3;
        ADD_PSS_EXTERNAL_SLOW = 4;
    }
    optional Type type = 7;
    optional int64 duration = 8;
}

/**
 * Logs that a process started, finished, crashed, or ANRed.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/BatteryStatsService.java
 */
message ProcessLifeCycleStateChanged {
    optional int32 uid = 1 [(is_uid) = true];

    // The process name (usually same as the app name).
    optional string process_name = 2;

    // What lifecycle state the process changed to.
    // This enum is specific to atoms.proto.
    enum State {
        FINISHED = 0;
        STARTED = 1;
        CRASHED = 2;
    }
    optional State state = 3;
}

/**
 * Logs when the ble scan state changes.
 *
 * Logged from:
 *   packages/apps/Bluetooth/src/com/android/bluetooth/gatt/AppScanStats.java
 */
message BleScanStateChanged {
    repeated AttributionNode attribution_node = 1;

    enum State {
        OFF = 0;
        ON = 1;
        // RESET indicates all ble stopped. Used when it (re)starts (e.g. after it crashes).
        RESET = 2;
    }
    optional State state = 2;

    // Does the scan have a filter.
    optional bool is_filtered = 3;
    // Whether the scan is a CALLBACK_TYPE_FIRST_MATCH scan. Called 'background' scan internally.
    optional bool is_first_match = 4;
    // Whether the scan set to piggy-back off the results of other scans (SCAN_MODE_OPPORTUNISTIC).
    optional bool is_opportunistic = 5;
}

/**
 * Logs reporting of a ble scan finding results.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
// TODO: Consider changing to tracking per-scanner-id (log from AppScanStats).
message BleScanResultReceived {
    repeated AttributionNode attribution_node = 1;

    // Number of ble scan results returned.
    optional int32 num_results = 2;
}

/**
 * Logs when a sensor state changes.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/BatteryStatsService.java
 */
message SensorStateChanged {
    repeated AttributionNode attribution_node = 1;

    // The id (int) of the sensor.
    optional int32 sensor_id = 2;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 3;
}


/**
 * Logs when GPS state changes.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message GpsScanStateChanged {
    repeated AttributionNode attribution_node = 1;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 2;
}


/**
 * Logs when a sync manager sync state changes.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/BatteryStatsService.java
 */
message SyncStateChanged {
    repeated AttributionNode attribution_node = 1;

    // Name of the sync (as named in the app). Can be chosen at run-time.
    optional string sync_name = 2;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 3;
}

/*
 * Deferred job stats.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/job/JobSchedulerService.java
*/
message DeferredJobStatsReported {
    repeated AttributionNode attribution_node = 1;

    // Number of jobs deferred.
    optional int32 num_jobs_deferred = 2;

    // Time since the last job runs.
    optional int64 time_since_last_job_millis = 3;
}

/**
 * Logs when a job scheduler job state changes.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/BatteryStatsService.java
 */
message ScheduledJobStateChanged {
    repeated AttributionNode attribution_node = 1;

    // Name of the job (as named in the app)
    optional string job_name = 2;

    enum State {
        FINISHED = 0;
        STARTED = 1;
        SCHEDULED = 2;
    }
    optional State state = 3;

    // The reason a job has stopped.
    // This is only applicable when the state is FINISHED.
    // The default value is STOP_REASON_UNKNOWN.
    optional android.app.job.StopReasonEnum stop_reason = 4;
}

/**
 * Logs when the audio state changes.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/BatteryStatsService.java
 */
message AudioStateChanged {
    repeated AttributionNode attribution_node = 1;

    enum State {
        OFF = 0;
        ON = 1;
        // RESET indicates all audio stopped. Used when it (re)starts (e.g. after it crashes).
        RESET = 2;
    }
    optional State state = 2;
}

/**
 * Logs when the video codec state changes.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/BatteryStatsService.java
 */
message MediaCodecStateChanged {
    repeated AttributionNode attribution_node = 1;

    enum State {
        OFF = 0;
        ON = 1;
        // RESET indicates all mediaCodec stopped. Used when it (re)starts (e.g. after it crashes).
        RESET = 2;
    }
    optional State state = 2;
}

/**
 * Logs when the flashlight state changes.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/BatteryStatsService.java
 */
message FlashlightStateChanged {
    repeated AttributionNode attribution_node = 1;

    enum State {
        OFF = 0;
        ON = 1;
        // RESET indicates all flashlight stopped. Used when it (re)starts (e.g. after it crashes).
        RESET = 2;
    }
    optional State state = 2;
}

/**
 * Logs when the camera state changes.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/BatteryStatsService.java
 */
message CameraStateChanged {
    repeated AttributionNode attribution_node = 1;

    enum State {
        OFF = 0;
        ON = 1;
        // RESET indicates all camera stopped. Used when it (re)starts (e.g. after it crashes).
        RESET = 2;
    }
    optional State state = 2;
}

/**
 * Logs that the state of a wakelock (per app and per wakelock name) has changed.
 *
 * Logged from:
 *   TODO
 */
message WakelockStateChanged {
    repeated AttributionNode attribution_node = 1;

    // The type (level) of the wakelock; e.g. a partial wakelock or a full wakelock.
    // From frameworks/base/core/proto/android/os/enums.proto.
    optional android.os.WakeLockLevelEnum level = 2;

    // The wakelock tag (Called tag in the Java API, sometimes name elsewhere).
    optional string tag = 3;

    enum State {
        RELEASE = 0;
        ACQUIRE = 1;
        CHANGE_RELEASE = 2;
        CHANGE_ACQUIRE = 3;
    }
    optional State state = 4;
}

/**
 * Logs when a partial wakelock is considered 'long' (over 1 min).
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message LongPartialWakelockStateChanged {
    repeated AttributionNode attribution_node = 1;

    // The wakelock tag (Called tag in the Java API, sometimes name elsewhere).
    optional string tag = 2;

    // TODO: I have no idea what this is.
    optional string history_tag = 3;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 4;
}

/**
 * Logs Battery Saver state change.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message BatterySaverModeStateChanged {
    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 1;
}

/**
 * Logs Doze mode state change.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message DeviceIdleModeStateChanged {
    optional android.server.DeviceIdleModeEnum state = 1;
}


/**
 * Logs state change of Doze mode including maintenance windows.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message DeviceIdlingModeStateChanged {
    optional android.server.DeviceIdleModeEnum state = 1;
}

/**
 * Logs screen brightness level.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/BatteryStatsService.java
 */
message ScreenBrightnessChanged {
    // Screen brightness level. Should be in [-1, 255] according to PowerManager.java.
    optional int32 level = 1;
}

/**
 * Logs battery level (percent full, from 0 to 100).
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message BatteryLevelChanged {
    // Battery level. Should be in [0, 100].
    optional int32 battery_level = 1;
}

/**
 * Logs change in charging status of the device.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message ChargingStateChanged {
    // State of the battery, from frameworks/base/core/proto/android/os/enums.proto.
    optional android.os.BatteryStatusEnum state = 1;
}

/**
 * Logs whether the device is plugged in, and what power source it is using.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message PluggedStateChanged {
    // Whether the device is plugged in, from frameworks/base/core/proto/android/os/enums.proto.
    optional android.os.BatteryPluggedStateEnum state = 1;
}

/**
 * Logs when an app's wakeup alarm fires.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
 */
message WakeupAlarmOccurred {
    repeated AttributionNode attribution_node = 1;

    // Name of the wakeup alarm.
    optional string tag = 2;
}

/**
 * Logs when an an app causes the mobile radio to change state.
 * Changing from LOW to MEDIUM or HIGH can be considered the app waking the mobile radio.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/NetworkManagementService.java
 */
message MobileRadioPowerStateChanged {
    repeated AttributionNode attribution_node = 1;

    // Power state, from frameworks/base/core/proto/android/telephony/enums.proto.
    optional android.telephony.DataConnectionPowerStateEnum state = 2;
}

/**
 * Logs when an an app causes the wifi radio to change state.
 * Changing from LOW to MEDIUM or HIGH can be considered the app waking the wifi radio.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/NetworkManagementService.java
 */
message WifiRadioPowerStateChanged {
    repeated AttributionNode attribution_node = 1;

    // Power state, from frameworks/base/core/proto/android/telephony/enums.proto.
    optional android.telephony.DataConnectionPowerStateEnum state = 2;
}

/**
 * Logs kernel wakeup reasons and aborts.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message KernelWakeupReported {
    // Name of the kernel wakeup reason (or abort).
    optional string wakeup_reason_name = 1;

    // Duration (in microseconds) for the wake-up interrupt to be serviced.
    optional int64 duration_micros = 2;
}

/**
 * Logs wifi locks held by an app.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message WifiLockStateChanged {
    repeated AttributionNode attribution_node = 1;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 2;
}

/**
 * Logs wifi signal strength changes.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message WifiSignalStrengthChanged {
    // Signal strength, from frameworks/base/core/proto/android/telephony/enums.proto.
    optional android.telephony.SignalStrengthEnum signal_strength = 1;
}

/**
 * Logs wifi scans performed by an app.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message WifiScanStateChanged {
    repeated AttributionNode attribution_node = 1;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 2;
}

/**
 * Logs wifi multicast locks held by an app
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message WifiMulticastLockStateChanged {
    repeated AttributionNode attribution_node = 1;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 2;
}

/**
 * Logs shutdown reason and duration on next boot.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/server/BootReceiver.java
 */
message ShutdownSequenceReported {
    // True if shutdown is for a reboot. Default: false if we do not know.
    optional bool reboot = 1;

    // Reason for shutdown. Eg: userrequested. Default: "<EMPTY>".
    optional string reason = 2;

    // Beginning of shutdown time in ms using wall clock time since unix epoch.
    // Default: 0 if no start time received.
    optional int64 start_time_millis = 3;

    // Duration of shutdown in ms. Default: 0 if no duration received.
    optional int64 duration_millis = 4;
}


/**
 * Logs boot reason and duration.
 *
 * Logged from:
 *   system/core/bootstat/bootstat.cpp
 */
message BootSequenceReported {
    // Reason for bootloader boot. Eg. reboot. See bootstat.cpp for larger list
    // Default: "<EMPTY>" if not available.
    optional string bootloader_reason = 1;

    // Reason for system boot. Eg. bootloader, reboot,userrequested
    // Default: "<EMPTY>" if not available.
    optional string system_reason = 2;

    // End of boot time in ms from unix epoch using system wall clock.
    optional int64 end_time_millis = 3;

    // Total boot duration in ms.
    optional int64 total_duration_millis = 4;

    // Bootloader duration in ms.
    optional int64 bootloader_duration_millis = 5;

    // Time since last boot in ms. Default: 0 if not available.
    optional int64 time_since_last_boot = 6;
}


/**
 * Logs call state and disconnect cause (if applicable).
 *
 * Logged from:
 *   packages/services/Telecomm/src/com/android/server/telecom/Call.java
 */
message CallStateChanged {
    // The state of the call. Eg. DIALING, ACTIVE, ON_HOLD, DISCONNECTED.
    // From frameworks/base/core/proto/android/telecomm/enums.proto.
    optional android.telecom.CallStateEnum call_state = 1;

    // The reason the call disconnected. Eg. ERROR, MISSED, REJECTED, BUSY.
    // This value is only applicable when the call_state is DISCONNECTED, and
    // should always be UNKNOWN if the call_state is not DISCONNECTED.
    // From frameworks/base/core/proto/android/telecomm/enums.proto.
    optional android.telecom.DisconnectCauseEnum disconnect_cause = 2;

    // True if the call is self-managed, which are apps that use the
    // telecom infrastructure to make their own calls.
    optional bool self_managed = 3;

    // True if call is external. External calls are calls on connected Wear
    // devices but show up in Telecom so the user can pull them onto the device.
    optional bool external_call = 4;
}

/**
 * Logs keyguard state. The keyguard is the lock screen.
 *
 * Logged from:
 *   frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/StatusBarKeyguardViewManager.java
 */
message KeyguardStateChanged {
    enum State {
        UNKNOWN = 0;
        // The keyguard is hidden when the phone is unlocked.
        HIDDEN = 1;
        // The keyguard is shown when the phone is locked (screen turns off).
        SHOWN= 2;
        // The keyguard is occluded when something is overlaying the keyguard.
        // Eg. Opening the camera while on the lock screen.
        OCCLUDED = 3;
    }
    optional State state = 1;
}

/**
 * Logs keyguard bouncer state. The bouncer is a part of the keyguard, and
 * prompts the user to enter a password (pattern, pin, etc).
 *
 * Logged from:
 *   frameworks/base/packages/SystemUI/src/com/android/systemui/statusbar/phone/KeyguardBouncer.java
 */

message KeyguardBouncerStateChanged {
    enum State {
        UNKNOWN = 0;
        // Bouncer is hidden, either as a result of successfully entering the
        // password, screen timing out, or user going back to lock screen.
        HIDDEN = 1;
        // This is when the user is being prompted to enter the password.
        SHOWN = 2;
    }
    optional State state = 1;
}

/**
 * Logs the result of entering a password into the keyguard bouncer.
 *
 * Logged from:
 *   frameworks/base/packages/SystemUI/src/com/android/keyguard/KeyguardSecurityContainer.java
 */
message KeyguardBouncerPasswordEntered {
    enum BouncerResult {
        UNKNOWN = 0;
        // The password entered was incorrect.
        FAILURE = 1;
        // The password entered was correct.
        SUCCESS = 2;
    }
    optional BouncerResult result = 1;
}

/*
 * Logs changes to the configuration of the device. The configuration is defined
 * in frameworks/base/core/java/android/content/res/Configuration.java
 * More documentation is at https://d.android.com/reference/android/content/res/Configuration.html
 * Please go there to interpret the possible values each field can be.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
 */
message ResourceConfigurationChanged {
    // Bit mask of color capabilities of the screen.
    // Contains information about the color gamut and hdr mode of the screen.
    // See: https://d.android.com/reference/android/content/res/Configuration.html#colorMode
    optional int32 colorMode = 1;

    // The target screen density being rendered to.
    // See: https://d.android.com/reference/android/content/res/Configuration.html#densityDpi
    optional int32 densityDpi = 2;

    // Current user preference for the scaling factor for fonts,
    // relative to the base density scaling.
    // See: https://d.android.com/reference/android/content/res/Configuration.html#fontScale
    optional float fontScale = 3;

    // Flag indicating whether the hard keyboard is hidden.
    // See: https://d.android.com/reference/android/content/res/Configuration.html#hardKeyboardHidden
    optional int32 hardKeyboardHidden = 4;

    // The type of keyboard attached to the device.
    // See: https://d.android.com/reference/android/content/res/Configuration.html#keyboard
    optional int32 keyboard = 5;

    // Flag indicating whether any keyboard is available. Takes soft keyboards into account.
    // See: https://d.android.com/reference/android/content/res/Configuration.html#keyboardHidden
    optional int32 keyboardHideen = 6;

    // IMSI MCC (Mobile Country Code), corresponding to mcc resource qualifier.
    // 0 if undefined.
    // See: https://d.android.com/reference/android/content/res/Configuration.html#mcc
    optional int32 mcc = 7;

    // IMSI MNC (Mobile Network Code), corresponding to mnc resource qualifier.
    // 0 if undefined. Note: the actual MNC may be 0, to check for this use the
    // MNC_ZERO symbol defined in Configuration.java.
    // See: https://d.android.com/reference/android/content/res/Configuration.html#mnc
    optional int32 mnc = 8;

    // The kind of navigation available on the device.
    // See: https://developer.android.com/reference/android/content/res/Configuration.html#navigation
    optional int32 navigation = 9;

    // Flag indicating whether the navigation is available.
    // See: https://d.android.com/reference/android/content/res/Configuration.html#navigationHidden
    optional int32 navigationHidden = 10;

    // Overall orientation of the screen.
    // See: https://d.android.com/reference/android/content/res/Configuration.html#orientation
    optional int32 orientation = 11;

    // The current height of the available screen space, in dp units.
    // See: https://d.android.com/reference/android/content/res/Configuration.html#screenHeightDp
    optional int32 screenHeightDp = 12;

    // Bit mask of overall layout of the screen.
    // Contains information about screen size, whether the screen is wider/taller
    // than normal, whether the screen layout is right-tl-left or left-to-right,
    // and whether the screen has a rounded shape.
    // See: https://d.android.com/reference/android/content/res/Configuration.html#screenLayout
    optional int32 screenLayout = 13;

    // Current width of the available screen space, in dp units.
    // See: https://d.android.com/reference/android/content/res/Configuration.html#screenWidthDp
    optional int32 screenWidthDp = 14;

    // The smallest screen size an application will see in normal operation.
    // This is the smallest value of both screenWidthDp and screenHeightDp
    // in portrait and landscape.
    // See: https://d.android.com/reference/android/content/res/Configuration.html#smallestScreenWidthDp
    optional int32 smallestScreenWidthDp = 15;

    // The type of touch screen attached to the device.
    // See: https://d.android.com/reference/android/content/res/Configuration.html#touchscreen
    optional int32 touchscreen = 16;

    // Bit mask of the ui mode.
    // Contains information about the overall ui mode of the device.
    // Eg: NORMAL, DESK, CAR, TELEVISION, WATCH, VR_HEADSET
    // Also contains information about whether the device is in night mode.
    // See: https://d.android.com/reference/android/content/res/Configuration.html#uiMode
    optional int32 uiMode = 17;
}


/**
 * Logs changes in the connection state of the mobile radio.
 *
 * Logged from:
 *    frameworks/opt/telephony/src/java/com/android/internal/telephony/dataconnection/DataConnection.java
 */
message MobileConnectionStateChanged {
    // States are from the state machine DataConnection.java.
    enum State {
        UNKNOWN = 0;
        // The connection is inactive, or disconnected.
        INACTIVE = 1;
        // The connection is being activated, or connecting.
        ACTIVATING = 2;
        // The connection is active, or connected.
        ACTIVE = 3;
        // The connection is disconnecting.
        DISCONNECTING = 4;
        // The connection is disconnecting after creating a connection.
        DISCONNECTION_ERROR_CREATING_CONNECTION = 5;
    }
    optional State state  = 1;
    // For multi-sim phones, this distinguishes between the sim cards.
    optional int32 sim_slot_index = 2;
    // Used to identify the connection. Starts at 0 and increments by 1 for
    // every new network created. Resets whenever the device reboots.
    optional int32 data_connection_id = 3;
    // A bitmask for the capabilities of this connection.
    // Eg. DEFAULT (internet), MMS, SUPL, DUN, IMS.
    // Default value (if we have no information): 0
    optional int64 capabilities = 4;
    // If this connection has internet.
    // This just checks if the DEFAULT bit of capabilities is set.
    optional bool has_internet = 5;
}

/**
 * Logs changes in mobile radio technology. eg: LTE, EDGE, CDMA.
 *
 * Logged from:
 *   frameworks/opt/telephony/src/java/com/android/internal/telephony/ServiceStateTracker.java
 */
message MobileRadioTechnologyChanged {
    optional android.telephony.NetworkTypeEnum state = 1;
    // For multi-sim phones, this distinguishes between the sim cards.
    optional int32 sim_slot_index = 2;
}

/**
 * Logs the VID and PID of any connected USB devices.
 *
 * Notes if any Audio, HID (input buttons/mouse/keyboard), or Storage interfaces are present.
 *
 * Logged by Vendor.
 */
message UsbDeviceAttached {
    optional int32 vid = 1;
    optional int32 pid = 2;
    optional bool has_audio = 3;
    optional bool has_hid = 4;
    optional bool has_storage = 5;
}


/**
 * Logs when Bluetooth is enabled and disabled.
 *
 * Logged from:
 *   services/core/java/com/android/server/BluetoothManagerService.java
 */
message BluetoothEnabledStateChanged {
    repeated AttributionNode attribution_node = 1;
    // Whether or not bluetooth is enabled on the device.
    enum State {
        UNKNOWN = 0;
        ENABLED = 1;
        DISABLED = 2;
    }
    optional State state = 2;
    // The reason for being enabled/disabled.
    // Eg. Airplane mode, crash, application request.
    optional android.bluetooth.EnableDisableReasonEnum reason = 3;
    // If the reason is an application request, this will be the package name.
    optional string pkgName = 4;
}

/**
 * Logs when a Bluetooth device connects and disconnects.
 *
 * Logged from:
 *    packages/apps/Bluetooth/src/com/android/bluetooth/btservice/AdapterProperties.java
 */
message BluetoothConnectionStateChanged {
    // The state of the connection.
    // Eg: CONNECTING, CONNECTED, DISCONNECTING, DISCONNECTED.
    optional android.bluetooth.ConnectionStateEnum state = 1;
    // An identifier that can be used to match connect and disconnect events.
    // Currently is last two bytes of a hash of a device level ID and
    // the mac address of the bluetooth device that is connected.
    optional int32 obfuscated_id = 2;
    // The profile that is connected. Eg. GATT, A2DP, HEADSET.
    // From android.bluetooth.BluetoothAdapter.java
    optional int32 bt_profile = 3;
}

/**
 * Logs when something is plugged into or removed from the USB-C connector.
 *
 * Logged from:
 *  Vendor USB HAL.
 */
message UsbConnectorStateChanged {
    enum State {
      DISCONNECTED = 0;
      CONNECTED = 1;
    }
    optional State state = 1;
}

/**
 * Logs the reported speaker impedance.
 *
 * Logged from:
 *  Vendor audio implementation.
 */
message SpeakerImpedanceReported {
    optional int32 speaker_location = 1;
    optional int32 impedance = 2;
}

/**
 * Logs the report of a failed hardware.
 *
 * Logged from:
 *  Vendor HALs.
 *
 */
message HardwareFailed {
    enum HardwareType {
        HARDWARE_FAILED_UNKNOWN = 0;
        HARDWARE_FAILED_MICROPHONE = 1;
        HARDWARE_FAILED_CODEC = 2;
        HARDWARE_FAILED_SPEAKER = 3;
        HARDWARE_FAILED_FINGERPRINT = 4;
    }
    optional HardwareType hardware_type = 1;

    /* hardware_location allows vendors to differentiate between multiple instances of
    * the same hardware_type.  The specific locations are vendor defined integers,
    * referring to board-specific numbering schemes.
    */
    optional int32 hardware_location = 2;

    /* failure_code is specific to the HardwareType of the failed hardware.
     * It should use the enum values defined below.
     */
    enum MicrophoneFailureCode {
        MICROPHONE_FAILURE_COMPLETE = 0;
    }
    enum CodecFailureCode {
        CODEC_FAILURE_COMPLETE = 0;
    }
    enum SpeakerFailureCode {
        SPEAKER_FAILURE_COMPLETE = 0;
        SPEAKER_FAILURE_HIGH_Z = 1;
        SPEAKER_FAILURE_SHORT = 2;
    }
    enum FingerprintFailureCode {
        FINGERPRINT_FAILURE_COMPLETE = 0;
        FINGERPRINT_SENSOR_BROKEN = 1;
        FINGERPRINT_TOO_MANY_DEAD_PIXELS = 2;
    }
    optional int32 failure_code = 3;
}

/**
 * Log an event when the device has been physically dropped.
 * Reported from the /vendor partition.
 */
message PhysicalDropDetected {
    // Confidence that the event was actually a drop, 0 -> 100
    optional int32 confidence_pctg = 1;
    // Peak acceleration of the drop, in 1/1000s of a g.
    optional int32 accel_peak_thousandths_g = 2;
    // Duration of freefall in ms
    optional int32 freefall_time_millis = 3;
}

/**
 * Log bucketed battery charge cycles.
 *
 * Each bucket represents cycles of the battery past
 * a given charge point.  For example, bucket 1 is the
 * lowest 1/8th of the battery, and bucket 8 is 100%.
 *
 * Logged from:
 * /sys/class/power_supply/bms/cycle_count, via Vendor.
 */
message ChargeCyclesReported {
    optional int32 cycle_bucket_1 = 1;
    optional int32 cycle_bucket_2 = 2;
    optional int32 cycle_bucket_3 = 3;
    optional int32 cycle_bucket_4 = 4;
    optional int32 cycle_bucket_5 = 5;
    optional int32 cycle_bucket_6 = 6;
    optional int32 cycle_bucket_7 = 7;
    optional int32 cycle_bucket_8 = 8;
}

/**
 * Logs the duration of a davey (jank of >=700ms) when it occurs
 *
 * Logged from:
 *   frameworks/base/libs/hwui/JankTracker.cpp
 */
message DaveyOccurred {
    // The UID that logged this atom.
    optional int32 uid = 1 [(is_uid) = true];

    // Amount of time it took to render the frame. Should be >=700ms.
    optional int64 jank_duration_millis = 2;
}

/**
 * Logs phone signal strength changes.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message PhoneSignalStrengthChanged {
    // Signal strength, from frameworks/base/core/proto/android/telephony/enums.proto.
    optional android.telephony.SignalStrengthEnum signal_strength = 1;
}

/**
 * Logs that a setting was updated.
 * Logged from:
 *   frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/SettingsState.java
 * The tag and is_default allow resetting of settings to default values based on the specified
 * tag. See Settings#putString(ContentResolver, String, String, String, boolean) for more details.
 */
message SettingChanged {
    // The name of the setting.
    optional string setting = 1;

    // The change being imposed on this setting. May represent a number, eg "3".
    optional string value = 2;

    // The new value of this setting. For most settings, this is same as value. For some settings,
    // value is +X or -X where X represents an element in a set. For example, if the previous value
    // is A,B,C and value is -B, then new_value is A,C and prev_value is A,B,C.
    // The +/- feature is currently only used for location_providers_allowed.
    optional string new_value = 3;

    // The previous value of this setting.
    optional string prev_value = 4;

    // The tag used with the is_default for resetting sets of settings. This is generally null.
    optional string tag = 5;

    // True if this setting with tag should be resettable.
    optional bool is_default = 6;

    // The associated user (for multi-user feature). Defined in android/os/UserHandle.java
    optional int32 user = 7;

    enum ChangeReason {
        UPDATED = 1; // Updated can be an insertion or an update.
        DELETED = 2;
    }
    optional ChangeReason reason = 8;
}

/**
 * Logs activity going to foreground or background
 *
 * Logged from:
  *   frameworks/base/services/core/java/com/android/server/am/ActivityRecord.java
 */
message ActivityForegroundStateChanged {
    optional int32 uid = 1 [(is_uid) = true];
    optional string pkg_name = 2;
    optional string class_name = 3;

    enum State {
        BACKGROUND = 0;
        FOREGROUND = 1;
    }
    optional State state = 4;
}

/**
 * Logs when an app crashes.
 * Logged from:
 *      frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
 */
message AppCrashOccurred {
    optional int32 uid = 1 [(is_uid) = true];

    optional string event_type = 2;

    // The name of the process.
    // system_server if it is not by an app
    optional string process_name = 3;

    // The pid if available. -1 means not available.
    optional sint32 pid = 4;

    optional string package_name = 5;

    enum InstantApp {
        UNAVAILABLE = 0;
        FALSE = 1;
        TRUE = 2;
    }
    optional InstantApp is_instant_app = 6;

    enum ForegroundState {
        UNKNOWN = 0;
        BACKGROUND = 1;
        FOREGROUND = 2;
    }
    optional ForegroundState foreground_state = 7;
}

/**
 * Logs when a WTF (What a Terrible Failure) happened.
 * Logged from:
 *      frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
 */
message WTFOccurred {
    optional int32 uid = 1 [(is_uid) = true];

    optional string tag = 2;

    // The name of the process.
    // system_server if it is not by an app
    optional string process_name = 3;

    // The pid if available. -1 means not available.
    optional sint32 pid = 4;
}

/**
 * Logs when system server reports low memory.
 * Logged from:
 *      frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
 */
message LowMemReported {
}

/**
 * Logs when an app ANR (App Not Responding) occurs.
 * Logged from:
 *      frameworks/base/services/core/java/com/android/server/am/AppErrors.java
 */
message ANROccurred {
    optional int32 uid = 1 [(is_uid) = true];

    optional string process_name = 2;

    optional string short_component_name = 3;

    optional string reason = 4;

    enum InstantApp {
        UNAVAILABLE = 0;
        FALSE = 1;
        TRUE = 2;
    }
    optional InstantApp is_instant_app = 5;

    enum ForegroundState {
        UNKNOWN = 0;
        BACKGROUND = 1;
        FOREGROUND = 2;
    }
    optional ForegroundState foreground_state = 6;
}

/**
 * Logs when the vibrator state changes.
 * Logged from:
 *      frameworks/base/services/core/java/com/android/server/VibratorService.java
 */
message VibratorStateChanged {
    repeated AttributionNode attribution_node = 1;

    enum State {
        OFF = 0;
        ON = 1;
    }
    optional State state = 2;

    // Duration (in milliseconds) requested to keep the vibrator on.
    // Only applicable for State == ON.
    optional int64 duration_millis = 3;
}

/*
 * Allows other apps to push events into statsd.
 * Logged from:
 *      frameworks/base/core/java/android/util/StatsLog.java
 */
message AppBreadcrumbReported {
    // The uid of the application that sent this custom atom.
    optional int32 uid = 1 [(is_uid) = true];

    // An arbitrary label chosen by the developer. For Android P, the label should be in [0, 16).
    optional int32 label = 2;

    // Allows applications to easily use a custom event as start/stop boundaries (ie, define custom
    // predicates for the metrics).
    enum State {
        UNKNOWN = 0;
        UNSPECIFIED = 1;  // For events that are known to not represent START/STOP.
        STOP = 2;
        START = 3;
    }
    optional State state = 3;
}

/**
 * Logs when statsd detects an anomaly.
 *
 * Logged from:
 *   frameworks/base/cmds/statsd/src/anomaly/AnomalyTracker.cpp
 */
message AnomalyDetected {
    // Uid that owns the config whose anomaly detection alert fired.
    optional int32 config_uid = 1 [(is_uid) = true];

    // Id of the config whose anomaly detection alert fired.
    optional int64 config_id = 2;

    // Id of the alert (i.e. name of the anomaly that was detected).
    optional int64 alert_id = 3;
}

message AppStartOccurred {
    // The uid if available. -1 means not available.
    optional int32 uid = 1 [(is_uid) = true];

    // The app package name.
    optional string pkg_name = 2;

    enum TransitionType {
        UNKNOWN = 0;
        WARM = 1;
        HOT = 2;
        COLD = 3;
    }
    // The transition type.
    optional TransitionType type = 3;

    // The activity name.
    optional string activity_name = 4;

    // The name of the calling app. Empty if not set.
    optional string calling_pkg_name = 5;

    // Whether the app is an instant app.
    optional bool is_instant_app = 6;

    // Device uptime when activity started.
    optional int64 activity_start_millis = 7;

    optional android.app.AppTransitionReasonEnum reason = 8;

    optional int32 transition_delay_millis = 9;
    // -1 if not set.
    optional int32 starting_window_delay_millis = 10;
    // -1 if not set.
    optional int32 bind_application_delay_millis = 11;
    optional int32 windows_drawn_delay_millis = 12;

    // Empty if not set.
    optional string launch_token = 13;

    // The compiler filter used when when the package was optimized.
    optional int32 package_optimization_compilation_filter = 14;

    // The reason why the package was optimized.
    optional int32 package_optimization_compilation_reason = 15;
}

message AppStartCanceled {
    // The uid if available. -1 means not available.
    optional int32 uid = 1 [(is_uid) = true];

    // The app package name.
    optional string pkg_name = 2;

    enum TransitionType {
        UNKNOWN = 0;
        WARM = 1;
        HOT = 2;
        COLD = 3;
    }
    // The transition type.
    optional TransitionType type = 3;

    // The activity name.
    optional string activity_name = 4;
}

message AppStartFullyDrawn {
    // The uid if available. -1 means not available.
    optional int32 uid = 1 [(is_uid) = true];

    // The app package name.
    optional string pkg_name = 2;

    enum TransitionType {
        UNKNOWN = 0;
        WITH_BUNDLE = 1;
        WITHOUT_BUNDLE = 2;
    }
    // The transition type.
    optional TransitionType type = 3;

    // The activity name.
    optional string activity_name = 4;

    optional bool transition_process_running = 5;

    // App startup time (until call to Activity#reportFullyDrawn()).
    optional int64 app_startup_time_millis = 6;
}

/**
 * Logs a picture-in-picture action
 * Logged from:
 *      frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
 *      frameworks/base/services/core/java/com/android/server/am/ActivityStackSupervisor.java
 *      frameworks/base/packages/SystemUI/src/com/android/systemui/pip/phone/PipTouchHandler.java
 */
message PictureInPictureStateChanged {
    // -1 if it is not available
    optional int32 uid = 1 [(is_uid) = true];

    optional string short_name = 2;

    enum State {
        ENTERED = 1;
        EXPANDED_TO_FULL_SCREEN = 2;
        MINIMIZED = 3;
        DISMISSED = 4;
    }
    optional State state = 3;
}

/**
 * Logs overlay action
 * Logged from:
 *     services/core/java/com/android/server/wm/Session.java
 */
message OverlayStateChanged {
    optional int32 uid = 1 [(is_uid) = true];

    optional string package_name = 2;

    optional bool using_alert_window = 3;

    enum State {
        ENTERED = 1;
        EXITED = 2;
    }
    optional State state = 4;
}

/*
 * Logs foreground service starts and stops.
 * Note that this is not when a service starts or stops, but when it is
 * considered foreground.
 * Logged from
 *     //frameworks/base/services/core/java/com/android/server/am/ActiveServices.java
 */
message ForegroundServiceStateChanged {
    optional int32 uid = 1 [(is_uid) = true];
    // package_name + "/" + class_name
    optional string short_name = 2;

    enum State {
        ENTER = 1;
        EXIT = 2;
    }
    optional State state = 3;
}

/**
 * Logs creation or removal of an isolated uid. Isolated uid's are temporary uid's to sandbox risky
 * behavior in its own uid. However, the metrics of these isolated uid's almost always should be
 * attributed back to the parent (host) uid. One example is Chrome.
 *
 * Logged from:
 *   frameworks/base/core/java/com/android/internal/os/BatteryStatsImpl.java
 */
message IsolatedUidChanged {
    // The host UID. Generally, we should attribute metrics from the isolated uid to the host uid.
    // NOTE: DO NOT annotate uid field in this atom. This atom is specially handled in statsd.
    // This field is ignored when event == REMOVED.
    optional int32 parent_uid = 1;

    optional int32 isolated_uid = 2;

    // We expect an isolated uid to be removed before if it's used for another parent uid.
    enum Event {
        REMOVED = 0;
        CREATED = 1;
    }
    optional Event event = 3;
}

/*
 * Logs the reception of an incoming network packet causing the main system to wake up for
 * processing that packet. These events are notified by the kernel via Netlink NFLOG to Netd
 * and processed by WakeupController.cpp.
 */
message PacketWakeupOccurred {
    // The uid owning the socket into which the packet was delivered, or -1 if the packet was
    // delivered nowhere.
    optional int32 uid = 1 [(is_uid) = true];
    // The interface name on which the packet was received.
    optional string iface = 2;
    // The ethertype value of the packet.
    optional int32 ethertype = 3;
    // String representation of the destination MAC address of the packet.
    optional string destination_hardware_address = 4;
    // String representation of the source address of the packet if this was an IP packet.
    optional string source_ip = 5;
    // String representation of the destination address of the packet if this was an IP packet.
    optional string destination_ip = 6;
    // The value of the protocol field if this was an IPv4 packet or the value of the Next Header
    // field if this was an IPv6 packet. The range of possible values is the same for both IP
    // families.
    optional int32 ip_next_header = 7;
    // The source port if this was a TCP or UDP packet.
    optional int32 source_port = 8;
    // The destination port if this was a TCP or UDP packet.
    optional int32 destination_port = 9;
}

/*
 * Logs the memory stats for an app on startup.
 * Logged from:
 *     frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
 */
message AppStartMemoryStateCaptured {
    // The uid if available. -1 means not available.
    optional int32 uid = 1 [(is_uid) = true];

    // The process name.
    optional string process_name = 2;

    // The activity name.
    optional string activity_name = 3;

    // # of page-faults
    optional int64 pgfault = 4;

    // # of major page-faults
    optional int64 pgmajfault = 5;

    // RSS
    optional int64 rss_in_bytes = 6;

    // CACHE
    optional int64 cache_in_bytes = 7;

    // SWAP
    optional int64 swap_in_bytes = 8;
}

/*
 * Logs the change in Low Memory Killer Daemon (LMKD) state which is used as start/stop boundaries
 * for LMK event.
 * Logged from:
 *      system/core/lmkd/lmkd.c
 */
message LmkStateChanged {
    enum State {
        UNKNOWN = 0;
        START = 1;
        STOP = 2;
    }
    optional State state = 1;
}

/*
 * Logs the event when Low Memory Killer Daemon (LMKD) kills a process to reduce memory pressure.
 * Logged from:
 *      system/core/lmkd/lmkd.c
 */
message LmkKillOccurred {
    // The uid if available. -1 means not available.
    optional int32 uid = 1 [(is_uid) = true];

    // The process name.
    optional string process_name = 2;

    // oom adj score.
    optional int32 oom_score = 3;

    // # of page-faults
    optional int64 pgfault = 4;

    // # of major page-faults
    optional int64 pgmajfault = 5;

    // RSS
    optional int64 rss_in_bytes = 6;

    // CACHE
    optional int64 cache_in_bytes = 7;

    // SWAP
    optional int64 swap_in_bytes = 8;
}

/*
 * Logs when the ActivityManagerService detects that an app died.
 *
 * Logged from:
 *   frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
 */
message AppDied {
    // timestamp(elapsedRealtime) of record creation
    optional uint64 timestamp_millis = 1 [(stateFieldOption).option = EXCLUSIVE];
}

/**
 * An atom for generic metrics logging. Available from Android Q.
 */
message GenericAtom {
    // The uid of the application that sent this custom atom.
    optional int32 uid = 1 [(is_uid) = true];

    // An event_id indicates the type of event.
    optional android.os.statsd.EventType event_id = 2;
}

//////////////////////////////////////////////////////////////////////
// Pulled atoms below this line //
//////////////////////////////////////////////////////////////////////

/**
 * Pulls bytes transferred via wifi (Sum of foreground and background usage).
 *
 * Pulled from:
 *   StatsCompanionService (using BatteryStats to get which interfaces are wifi)
 */
message WifiBytesTransfer {
    optional int32 uid = 1 [(is_uid) = true];

    optional int64 rx_bytes = 2;

    optional int64 rx_packets = 3;

    optional int64 tx_bytes = 4;

    optional int64 tx_packets = 5;
}

/**
 * Pulls bytes transferred via wifi (separated by foreground and background usage).
 *
 * Pulled from:
 *   StatsCompanionService (using BatteryStats to get which interfaces are wifi)
 */
message WifiBytesTransferByFgBg {
    optional int32 uid = 1 [(is_uid) = true];

    // 1 denotes foreground and 0 denotes background. This is called Set in NetworkStats.
    optional bool is_foreground = 2;

    optional int64 rx_bytes = 3;

    optional int64 rx_packets = 4;

    optional int64 tx_bytes = 5;

    optional int64 tx_packets = 6;
}

/**
 * Pulls bytes transferred via mobile networks (Sum of foreground and background usage).
 *
 * Pulled from:
 *   StatsCompanionService (using BatteryStats to get which interfaces are mobile data)
 */
message MobileBytesTransfer {
    optional int32 uid = 1 [(is_uid) = true];

    optional int64 rx_bytes = 2;

    optional int64 rx_packets = 3;

    optional int64 tx_bytes = 4;

    optional int64 tx_packets = 5;
}

/**
 * Pulls bytes transferred via mobile networks (separated by foreground and background usage).
 *
 * Pulled from:
 *   StatsCompanionService (using BatteryStats to get which interfaces are mobile data)
 */
message MobileBytesTransferByFgBg {
    optional int32 uid = 1 [(is_uid) = true];

    // 1 denotes foreground and 0 denotes background. This is called Set in
    // NetworkStats.
    optional bool is_foreground = 2;

    optional int64 rx_bytes = 3;

    optional int64 rx_packets = 4;

    optional int64 tx_bytes = 5;

    optional int64 tx_packets = 6;
}

/**
 * Pulls bytes transferred via bluetooth. It is pulled from Bluetooth controller.
 *
 * Pulled from:
 *   StatsCompanionService
 */
message BluetoothBytesTransfer {
    optional int32 uid = 1 [(is_uid) = true];

    optional int64 rx_bytes = 2;

    optional int64 tx_bytes = 3;
}

/**
 * Pulls the kernel wakelock durations. This atom is adapted from
 * android/internal/os/KernelWakelockStats.java
 *
 * Pulled from:
 *   StatsCompanionService using KernelWakelockReader.
 */
message KernelWakelock {
    optional string name = 1;

    optional int32 count = 2;

    optional int32 version = 3;

    optional int64 time = 4;
}

/**
 * Pulls low power state information. This includes platform and subsystem sleep state information,
 * PowerStatePlatformSleepState, PowerStateVoter or PowerStateSubsystemSleepState as defined in
 *   hardware/interfaces/power/1.0/types.hal
 *   hardware/interfaces/power/1.1/types.hal
 */
message SubsystemSleepState {
    // Subsystem name
    optional string subsystem_name = 1;
    // For PlatformLowPowerStats (hal 1.0), this is the voter name, which could be empty.
    // For SubsystemLowPowerStats (hal 1.1), this is the sleep state name.
    optional string subname = 2;
    // The number of times it entered, or voted for entering the sleep state
    optional uint64 count = 3;
    // The length of time spent in, or spent voting for, the sleep state
    optional uint64 time_millis = 4;
}

/**
 * Pulls Cpu time per frequency.
 * Pulls the time the cpu spend on the frequency index. Frequency index
 * starts from highest to lowest. The value should be monotonically
 * increasing since boot. However, if there is a cpu
 * hotplug event, the value would be reset as well.
 */
message CpuTimePerFreq {
    optional uint32 cluster = 1;
    optional uint32 freq_index = 2;
    optional uint64 time_millis = 3;
}

/**
 * Pulls Cpu Time Per Uid.
 * Note that isolated process uid time should be attributed to host uids.
 */
message CpuTimePerUid {
    optional int32 uid = 1 [(is_uid) = true];
    optional uint64 user_time_millis = 2;
    optional uint64 sys_time_millis = 3;
}

/**
 * Pulls Cpu Time Per Uid per frequency.
 * Note that isolated process uid time should be attributed to host uids.
 * For each uid, we order the time by descending frequencies.
 */
message CpuTimePerUidFreq {
    optional int32 uid = 1 [(is_uid) = true];
    optional uint32 freq_index = 2;
    optional uint64 time_millis = 3;
}

/**
 * Pulls Wifi Controller Activity Energy Info
 */
message WifiActivityInfo {
    // timestamp(wall clock) of record creation
    optional uint64 timestamp_millis = 1;
    // stack reported state
    // TODO: replace this with proto enum
    optional int32 stack_state = 2;
    // tx time in ms
    optional uint64 controller_tx_time_millis = 3;
    // rx time in ms
    optional uint64 controller_rx_time_millis = 4;
    // idle time in ms
    optional uint64 controller_idle_time_millis = 5;
    // product of current(mA), voltage(V) and time(ms)
    optional uint64 controller_energy_used = 6;
}

/**
 * Pulls Modem Activity Energy Info
 */
message ModemActivityInfo {
    // timestamp(wall clock) of record creation
    optional uint64 timestamp_millis = 1;
    // sleep time in ms.
    optional uint64 sleep_time_millis = 2;
    // idle time in ms
    optional uint64 controller_idle_time_millis = 3;
    /**
     * Tx power index
     * index 0 = tx_power < 0dBm
     * index 1 = 0dBm < tx_power < 5dBm
     * index 2 = 5dBm < tx_power < 15dBm
     * index 3 = 15dBm < tx_power < 20dBm
     * index 4 = tx_power > 20dBm
     */
    // tx time in ms at power level 0
    optional uint64 controller_tx_time_pl0_millis = 4;
    // tx time in ms at power level 1
    optional uint64 controller_tx_time_pl1_millis = 5;
    // tx time in ms at power level 2
    optional uint64 controller_tx_time_pl2_millis = 6;
    // tx time in ms at power level 3
    optional uint64 controller_tx_time_pl3_millis = 7;
    // tx time in ms at power level 4
    optional uint64 controller_tx_time_pl4_millis = 8;
    // rx time in ms at power level 5
    optional uint64 controller_rx_time_millis = 9;
    // product of current(mA), voltage(V) and time(ms)
    optional uint64 energy_used = 10;
}

/**
 * Pulls Bluetooth Activity Energy Info
 * Note: BluetoothBytesTransfer is pulled at the same time from the controller.
 */
message BluetoothActivityInfo {
    // timestamp(wall clock) of record creation
    optional uint64 timestamp_millis = 1;
    // bluetooth stack state
    optional int32 bluetooth_stack_state = 2;
    // tx time in ms
    optional uint64 controller_tx_time_millis = 3;
    // rx time in ms
    optional uint64 controller_rx_time_millis = 4;
    // idle time in ms
    optional uint64 controller_idle_time_millis = 5;
    // product of current(mA), voltage(V) and time(ms)
    optional uint64 energy_used = 6;
}

/*
 * Logs the memory stats for a process.
 */
message ProcessMemoryState {
    // The uid if available. -1 means not available.
    optional int32 uid = 1 [(is_uid) = true];

    // The process name.
    optional string process_name = 2;

    // oom adj score.
    optional int32 oom_score = 3;

    // # of page-faults
    optional int64 pgfault = 4;

    // # of major page-faults
    optional int64 pgmajfault = 5;

    // RSS
    optional int64 rss_in_bytes = 6;

    // CACHE
    optional int64 cache_in_bytes = 7;

    // SWAP
    optional int64 swap_in_bytes = 8;
}

/*
 * Elapsed real time from SystemClock.
 */
message SystemElapsedRealtime {
    optional uint64 time_millis = 1;
}

/*
 * Up time from SystemClock.
 */
message SystemUptime {
    // Milliseconds since the system was booted.
    // This clock stops when the system enters deep sleep (CPU off, display dark, device waiting
    // for external input).
    // It is not affected by clock scaling, idle, or other power saving mechanisms.
    optional uint64 uptime_millis = 1;
}

/*
 * Reads from /proc/uid_concurrent_active_time which has the format:
 * active: X (X is # cores)
 * [uid0]: [time-0] [time-1] [time-2] ... (# entries = # cores)
 * [uid1]: [time-0] [time-1] [time-2] ... ...
 * ...
 * Time-N means the CPU time a UID spent running concurrently with N other processes.
 * The file contains a monotonically increasing count of time for a single boot.
 */
message CpuActiveTime {
    optional int32 uid = 1 [(is_uid) = true];
    optional uint64 time_millis = 2;
}

/**
 * Reads from /proc/uid_concurrent_policy_time which has the format:
 * policy0: X policy4: Y (there are X cores on policy0, Y cores on policy4)
 * [uid0]: [time-0-0] [time-0-1] ... [time-1-0] [time-1-1] ...
 * [uid1]: [time-0-0] [time-0-1] ... [time-1-0] [time-1-1] ...
 * ...
 * Time-X-Y means the time a UID spent on clusterX running concurrently with Y other processes.
 * The file contains a monotonically increasing count of time for a single boot.
 */
message CpuClusterTime {
    optional int32 uid = 1 [(is_uid) = true];
    optional int32 cluster_index = 2;
    optional uint64 time_millis = 3;
}

/*
 * Pulls free disk space, for data, system partition and temporary directory.
 */
message DiskSpace {
    // available bytes in data partition
    optional uint64 data_available_bytes = 1;
    // available bytes in system partition
    optional uint64 system_available_bytes = 2;
    // available bytes in download cache or temp directories
    optional uint64 temp_available_bytes = 3;
}

/**
 * Pulls battery coulomb counter, which is the remaining battery charge in uAh.
 * Pulled from:
 *   frameworks/base/cmds/statsd/src/external/ResourceHealthManagerPuller.cpp
 */
message RemainingBatteryCapacity {
    optional int32 charge_uAh = 1;
}

/**
 * Pulls battery capacity, which is the battery capacity when full in uAh.
 * Pulled from:
 *   frameworks/base/cmds/statsd/src/external/ResourceHealthManagerPuller.cpp
 */
message FullBatteryCapacity {
    optional int32 capacity_uAh = 1;
}

/**
 * Pulls the temperature of various parts of the device.
 * The units are tenths of a degree Celsius. Eg: 30.3C is reported as 303.
 *
 * Pulled from:
 *   frameworks/base/cmds/statsd/src/external/ResourceThermalManagerPuller.cpp
 */
message Temperature {
    // The type of temperature being reported. Eg. CPU, GPU, SKIN, BATTERY.
    optional android.os.TemperatureTypeEnum sensor_location = 1;

    // The name of the temperature source. Eg. CPU0
    optional string sensor_name = 2;

    // Temperature in tenths of a degree C.
    optional int32 temperature_dC = 3;
}

/**
 * Pulls the statistics of calls to Binder.
 *
 * Binder stats will be reset every time the data is pulled. It means it can only be pulled by one
 * config on the device.
 *
 * Next tag: 14
 */
message BinderCalls {
    optional int32 uid = 1 [(is_uid) = true];
    // Fully qualified class name of the API call.
    //
    // This is a system server class name.
    //
    // TODO(gaillard): figure out if binder call stats includes data from isolated uids, if a uid
    // gets recycled and we have isolated uids, we might attribute the data incorrectly.
    // TODO(gaillard): there is a high dimensions cardinality, figure out if we should drop the less
    // commonly used APIs.
    optional string service_class_name = 2;
    // Method name of the API call. It can also be a transaction code if we cannot
    // resolve it to a name. See Binder#getTransactionName.
    //
    // This is a system server method name.
    optional string service_method_name = 3;
    // Total number of API calls.
    optional int64 call_count = 4;
    // True if the screen was interactive PowerManager#isInteractive at the end of the call.
    optional bool screen_interactive = 13;
    // Total number of API calls we have data recorded for. If we collected data for all the calls,
    // call_count will be equal to recorded_call_count.
    //
    // If recorded_call_count is different than call_count, it means data collection has been
    // sampled. All the fields below will be sampled in this case.
    optional int64 recorded_call_count = 12;
    // Number of exceptions thrown by the API.
    optional int64 recorded_exception_count = 5;
    // Total latency of all API calls.
    // Average can be computed using total_latency_micros / recorded_call_count.
    optional int64 recorded_total_latency_micros = 6;
    // Maximum latency of one API call.
    optional int64 recorded_max_latency_micros = 7;
    // Total CPU usage of all API calls.
    // Average can be computed using total_cpu_micros / recorded_call_count.
    // Total can be computed using total_cpu_micros / recorded_call_count * call_count.
    optional int64 recorded_total_cpu_micros = 8;
    // Maximum CPU usage of one API call.
    optional int64 recorded_max_cpu_micros = 9;
    // Maximum parcel reply size of one API call.
    optional int64 recorded_max_reply_size_bytes = 10;
    // Maximum parcel request size of one API call.
    optional int64 recorded_max_request_size_bytes = 11;
}

/**
 * Pulls the statistics of exceptions during calls to Binder.
 *
 * Binder stats are cumulative from boot unless somebody reset the data using
 * > adb shell dumpsys binder_calls_stats --reset
 */
message BinderCallsExceptions {
    // Exception class name, e.g. java.lang.IllegalArgumentException.
    //
    // This is an exception class name thrown by the system server.
    optional string exception_class_name = 1;
    // Total number of exceptions.
    optional int64 exception_count = 2;
}

message LooperStats {
    // Currently not collected and always set to 0.
    optional int32 uid = 1 [(is_uid) = true];

    // Fully qualified class name of the handler target class.
    //
    // This field does not contain PII. This is a system server class name.
    optional string handler_class_name = 2;

    // The name of the thread that runs the Looper.
    //
    // This field does not contain PII. This is a system server thread name.
    optional string looper_thread_name = 3;

    // The name of the dispatched message.
    //
    // This field does not contain PII. This is a system server constant or class
    // name.
    optional string message_name = 4;

    // Total number of successfully dispatched messages.
    optional int64 message_count = 5;

    // Total number of messages that failed dispatching.
    optional int64 exception_count = 6;

    // Total number of processed messages we have data recorded for. If we
    // collected data for all the messages, message_count will be equal to
    // recorded_message_count.
    //
    // If recorded_message_count is different than message_count, it means data
    // collection has been sampled. All the fields below will be sampled in this
    // case.
    optional int64 recorded_message_count = 7;

    // Total latency of all processed messages.
    // Average can be computed using recorded_total_latency_micros /
    // recorded_message_count.
    optional int64 recorded_total_latency_micros = 8;

    // Total CPU usage of all processed message.
    // Average can be computed using recorded_total_cpu_micros /
    // recorded_message_count. Total can be computed using
    // recorded_total_cpu_micros / recorded_message_count * call_count.
    optional int64 recorded_total_cpu_micros = 9;
}

/**
 * Pulls disk information, such as write speed and latency.
 */
message DiskStats {
    // Time taken to open, write 512B to, and close a file.
    // -1 if error performing the check.
    optional int64 data_write_latency_millis = 1;

    optional bool file_based_encryption = 2;

    // Recent disk write speed in kB/s.
    // -1 if error querying storageed.
    // 0 if data is unavailable.
    optional int32 recent_disk_write_speed = 3;
}


/**
 * Free and total bytes of the Data, Cache, and System partition.
 */
message DirectoryUsage {
    enum Directory {
        UNKNOWN = 0;
        DATA = 1;
        CACHE = 2;
        SYSTEM = 3;
    }
    optional Directory directory = 1;
    optional int64 free_bytes = 2;
    optional int64 total_bytes = 3;
}


/**
 * Size of an application: apk size, data size, and cache size.
 * Reads from a cached file produced daily by DiskStatsLoggingService.java.
 * Information is only reported for apps with the primary user (user 0).
 * Sizes are aggregated by package name.
 */
message AppSize {
    // Including uids will involve modifying diskstats logic.
    optional string package_name = 1;
    // App size in bytes. -1 if unavailable.
    optional int64 app_size_bytes = 2;
    // App data size in bytes. -1 if unavailable.
    optional int64 app_data_size_bytes = 3;
    // App cache size in bytes. -1 if unavailable.
    optional int64 app_cache_size_bytes = 4;
    // Time that the cache file was produced.
    // Uses System.currentTimeMillis(), which is wall clock time.
    optional int64 cache_time_millis = 5;
}


/**
 * Size of a particular category. Eg: photos, videos.
 * Reads from a cached file produced daily by DiskStatsLoggingService.java.
 */
message CategorySize {
    enum Category {
        UNKNOWN = 0;
        APP_SIZE = 1;
        APP_DATA_SIZE = 2;
        APP_CACHE_SIZE = 3;
        PHOTOS = 4;
        VIDEOS = 5;
        AUDIO = 6;
        DOWNLOADS = 7;
        SYSTEM = 8;
        OTHER = 9;
    }
    optional Category category = 1;
    // Category size in bytes.
    optional int64 size_bytes = 2;
    // Time that the cache file was produced.
    // Uses System.currentTimeMillis(), which is wall clock time.
    optional int64 cache_time_millis = 3;
}