/*
 * Copyright (C) 2016 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 clearcut.connectivity;

option java_package = "com.android.server.wifi";
option java_outer_classname = "WifiMetricsProto";

// The information about the Wifi events.
message WifiLog {

  // Session information that gets logged for every Wifi connection.
  repeated ConnectionEvent connection_event = 1;

  // Number of saved networks in the user profile.
  optional int32 num_saved_networks = 2;

  // Number of open networks in the saved networks.
  optional int32 num_open_networks = 3;

  // Number of personal networks.
  optional int32 num_personal_networks = 4;

  // Number of enterprise networks.
  optional int32 num_enterprise_networks = 5;

  // Does the user have location setting enabled.
  optional bool is_location_enabled = 6;

  // Does the user have scanning enabled.
  optional bool is_scanning_always_enabled = 7;

  // Number of times user toggled wifi using the settings menu.
  optional int32 num_wifi_toggled_via_settings = 8;

  // Number of times user toggled wifi using the airplane menu.
  optional int32 num_wifi_toggled_via_airplane = 9;

  // Number of networks added by the user.
  optional int32 num_networks_added_by_user = 10;

  // Number of networks added by applications.
  optional int32 num_networks_added_by_apps = 11;

  // Number scans that returned empty results.
  optional int32 num_empty_scan_results = 12;

  // Number scans that returned at least one result.
  optional int32 num_non_empty_scan_results = 13;

  // Number of single scans requests.
  optional int32 num_oneshot_scans = 14;

  // Number of repeated background scans that were scheduled to the chip.
  optional int32 num_background_scans = 15;

  // Error codes that a scan can result in.
  enum ScanReturnCode {

    // Return Code is unknown.
    SCAN_UNKNOWN = 0;

    // Scan was successful.
    SCAN_SUCCESS = 1;

    // Scan was successfully started, but was interrupted.
    SCAN_FAILURE_INTERRUPTED = 2;

    //  Scan failed to start because of invalid configuration
    //  (bad channel, etc).
    SCAN_FAILURE_INVALID_CONFIGURATION = 3;

    // Could not start a scan because wifi is disabled.
    FAILURE_WIFI_DISABLED = 4;

  }

  // Mapping of error codes to the number of times that scans resulted
  // in that error.
  repeated ScanReturnEntry scan_return_entries = 16;

  message ScanReturnEntry {

     // Return code of the scan.
     optional ScanReturnCode scan_return_code = 1;

     // Number of entries that were found in the scan.
     optional int32 scan_results_count = 2;
  }

  // State of the Wifi.
  enum WifiState {

    // State is unknown.
    WIFI_UNKNOWN = 0;

    // Wifi is disabled.
    WIFI_DISABLED = 1;

    // Wifi is enabled.
    WIFI_DISCONNECTED = 2;

    // Wifi is enabled and associated with an AP.
    WIFI_ASSOCIATED = 3;
  }

  // Mapping of system state to the number of times that scans were requested in
  // that state
  repeated WifiSystemStateEntry wifi_system_state_entries = 17;

  message WifiSystemStateEntry {

     // Current WiFi state.
     optional WifiState wifi_state = 1;

     // Count of scans in state.
     optional int32 wifi_state_count = 2;

     // Is screen on.
     optional bool is_screen_on = 3;
  }

  // Mapping of Error/Success codes to the number of background scans that resulted in it
  repeated ScanReturnEntry background_scan_return_entries = 18;

  // Mapping of system state to the number of times that Background scans were requested in that
  // state
  repeated WifiSystemStateEntry background_scan_request_state = 19;

  // Total number of times the Watchdog of Last Resort triggered, resetting the wifi stack
  optional int32 num_last_resort_watchdog_triggers = 20;

  // Total number of networks over bad association threshold when watchdog triggered
  optional int32 num_last_resort_watchdog_bad_association_networks_total = 21;

  // Total number of networks over bad authentication threshold when watchdog triggered
  optional int32 num_last_resort_watchdog_bad_authentication_networks_total = 22;

  // Total number of networks over bad dhcp threshold when watchdog triggered
  optional int32 num_last_resort_watchdog_bad_dhcp_networks_total = 23;

  // Total number of networks over bad other threshold when watchdog triggered
  optional int32 num_last_resort_watchdog_bad_other_networks_total = 24;

  // Total count of networks seen when watchdog triggered
  optional int32 num_last_resort_watchdog_available_networks_total = 25;

  // Total count of triggers with atleast one bad association network
  optional int32 num_last_resort_watchdog_triggers_with_bad_association = 26;

  // Total count of triggers with atleast one bad authentication network
  optional int32 num_last_resort_watchdog_triggers_with_bad_authentication = 27;

  // Total count of triggers with atleast one bad dhcp network
  optional int32 num_last_resort_watchdog_triggers_with_bad_dhcp = 28;

  // Total count of triggers with atleast one bad other network
  optional int32 num_last_resort_watchdog_triggers_with_bad_other = 29;

  // Count of times connectivity watchdog confirmed pno is working
  optional int32 num_connectivity_watchdog_pno_good = 30;

  // Count of times connectivity watchdog found pno not working
  optional int32 num_connectivity_watchdog_pno_bad = 31;

  // Count of times connectivity watchdog confirmed background scan is working
  optional int32 num_connectivity_watchdog_background_good = 32;

  // Count of times connectivity watchdog found background scan not working
  optional int32 num_connectivity_watchdog_background_bad = 33;

  // The time duration represented by this wifi log, from start to end of capture
  optional int32 record_duration_sec = 34;

  // Counts the occurrences of each individual RSSI poll level
  repeated RssiPollCount rssi_poll_rssi_count = 35;

  // Total number of times WiFi connected immediately after a Last Resort Watchdog trigger,
  // without new networks becoming available.
  optional int32 num_last_resort_watchdog_successes = 36;

  // Total number of saved hidden networks
  optional int32 num_hidden_networks = 37;

  // Total number of saved passpoint / hotspot 2.0 networks
  optional int32 num_passpoint_networks = 38;

  // Total number of scan results
  optional int32 num_total_scan_results = 39;

  // Total number of scan results for open networks
  optional int32 num_open_network_scan_results = 40;

  // Total number of scan results for personal networks
  optional int32 num_personal_network_scan_results = 41;

  // Total number of scan results for enterprise networks
  optional int32 num_enterprise_network_scan_results = 42;

  // Total number of scan results for hidden networks
  optional int32 num_hidden_network_scan_results = 43;

  // Total number of scan results for hotspot 2.0 r1 networks
  optional int32 num_hotspot2_r1_network_scan_results = 44;

  // Total number of scan results for hotspot 2.0 r2 networks
  optional int32 num_hotspot2_r2_network_scan_results = 45;

  // Total number of scans handled by framework (oneshot or otherwise)
  optional int32 num_scans = 46;

  // Counts the occurrences of each alert reason.
  repeated AlertReasonCount alert_reason_count = 47;

  // Counts the occurrences of each Wifi score
  repeated WifiScoreCount wifi_score_count = 48;

  // Histogram of Soft AP Durations
  repeated SoftApDurationBucket soft_ap_duration = 49;

  // Histogram of Soft AP ReturnCode
  repeated SoftApReturnCodeCount soft_ap_return_code = 50;

  // Histogram of the delta between scan result RSSI and RSSI polls
  repeated RssiPollCount rssi_poll_delta_count = 51;

  // List of events
  repeated StaEvent sta_event_list = 52;

  // Total number of times WiFi HAL crashed.
  optional int32 num_hal_crashes = 53;

  // Total number of times WiFicond crashed.
  optional int32 num_wificond_crashes = 54;

  // Indicates the number of times an error was encountered in
  // Wifi HAL on |WifiNative.setupInterfaceForClientMode|.
  optional int32 num_setup_client_interface_failure_due_to_hal = 55;

  // Indicates the number of times an error was encountered in
  // Wificond on |WifiNative.setupInterfaceForClientMode|.
  optional int32 num_setup_client_interface_failure_due_to_wificond = 56;

  // Wi-Fi Aware metrics
  optional WifiAwareLog wifi_aware_log = 57;

  // Number of saved Passpoint providers in user profile.
  optional int32 num_passpoint_providers = 58;

  // Count of times Passpoint provider being installed.
  optional int32 num_passpoint_provider_installation = 59;

  // Count of times Passpoint provivider is installed successfully.
  optional int32 num_passpoint_provider_install_success = 60;

  // Count of times Passpoint provider is being uninstalled.
  optional int32 num_passpoint_provider_uninstallation = 61;

  // Count of times Passpoint provider is uninstalled successfully.
  optional int32 num_passpoint_provider_uninstall_success = 62;

  // Count of saved Passpoint providers device has ever connected to.
  optional int32 num_passpoint_providers_successfully_connected = 63;

  // Histogram counting instances of scans with N many ScanResults with unique ssids
  repeated NumConnectableNetworksBucket total_ssids_in_scan_histogram = 64;

  // Histogram counting instances of scans with N many ScanResults/bssids
  repeated NumConnectableNetworksBucket total_bssids_in_scan_histogram = 65;

  // Histogram counting instances of scans with N many unique open ssids
  repeated NumConnectableNetworksBucket available_open_ssids_in_scan_histogram = 66;

  // Histogram counting instances of scans with N many bssids for open networks
  repeated NumConnectableNetworksBucket available_open_bssids_in_scan_histogram = 67;

  // Histogram counting instances of scans with N many unique ssids for saved networks
  repeated NumConnectableNetworksBucket available_saved_ssids_in_scan_histogram = 68;

  // Histogram counting instances of scans with N many bssids for saved networks
  repeated NumConnectableNetworksBucket available_saved_bssids_in_scan_histogram = 69;

  // Histogram counting instances of scans with N many unique SSIDs for open or saved networks
  repeated NumConnectableNetworksBucket available_open_or_saved_ssids_in_scan_histogram = 70;

  // Histogram counting instances of scans with N many BSSIDs for open or saved networks
  repeated NumConnectableNetworksBucket available_open_or_saved_bssids_in_scan_histogram = 71;

  // Histogram counting instances of scans with N many ScanResults matching unique saved passpoint providers
  repeated NumConnectableNetworksBucket available_saved_passpoint_provider_profiles_in_scan_histogram = 72;

  // Histogram counting instances of scans with N many ScanResults BSSIDs matching a saved passpoint provider
  repeated NumConnectableNetworksBucket available_saved_passpoint_provider_bssids_in_scan_histogram = 73;

  // Counts the number of AllSingleScanLister.onResult calls with a full band scan result
  optional int32 full_band_all_single_scan_listener_results = 74;

  // Counts the number of AllSingleScanLister.onResult calls with a partial (channels) scan result
  optional int32 partial_all_single_scan_listener_results = 75;

  // Pno scan metrics
  optional PnoScanMetrics pno_scan_metrics = 76;

  // Histogram of "Connect to Network" notifications.
  // The notification Action should be unset.
  repeated ConnectToNetworkNotificationAndActionCount connect_to_network_notification_count = 77;

  // Histogram of "Connect to Network" notification user actions.
  repeated ConnectToNetworkNotificationAndActionCount connect_to_network_notification_action_count = 78;

  // The number of SSIDs blacklisted from recommendation by the open network
  // notification recommender
  optional int32 open_network_recommender_blacklist_size = 79;

  // Is the available network notification feature turned on
  optional bool is_wifi_networks_available_notification_on = 80;

  // Count of recommendation updates made by the open network notification
  // recommender
  optional int32 num_open_network_recommendation_updates = 81;

  // Count of connection attempts that were initiated unsuccessfully
  optional int32 num_open_network_connect_message_failed_to_send = 82;

  // Histogram counting instances of scans with N many HotSpot 2.0 R1 APs
  repeated NumConnectableNetworksBucket observed_hotspot_r1_aps_in_scan_histogram = 83;

  // Histogram counting instances of scans with N many HotSpot 2.0 R2 APs
  repeated NumConnectableNetworksBucket observed_hotspot_r2_aps_in_scan_histogram = 84;

  // Histogram counting instances of scans with N many unique HotSpot 2.0 R1 ESS.
  // Where ESS is defined as the (HESSID, ANQP Domain ID), (SSID, ANQP Domain ID) or
  // (SSID, BSSID) tuple depending on AP configuration (in the above priority
  // order).
  repeated NumConnectableNetworksBucket observed_hotspot_r1_ess_in_scan_histogram = 85;

  // Histogram counting instances of scans with N many unique HotSpot 2.0 R2 ESS.
  // Where ESS is defined as the (HESSID, ANQP Domain ID), (SSID, ANQP Domain ID) or
  // (SSID, BSSID) tuple depending on AP configuration (in the above priority
  // order).
  repeated NumConnectableNetworksBucket observed_hotspot_r2_ess_in_scan_histogram = 86;

  // Histogram counting number of HotSpot 2.0 R1 APs per observed ESS in a scan
  // (one value added per unique ESS - potentially multiple counts per single
  // scan!)
  repeated NumConnectableNetworksBucket observed_hotspot_r1_aps_per_ess_in_scan_histogram = 87;

  // Histogram counting number of HotSpot 2.0 R2 APs per observed ESS in a scan
  // (one value added per unique ESS - potentially multiple counts per single
  // scan!)
  repeated NumConnectableNetworksBucket observed_hotspot_r2_aps_per_ess_in_scan_histogram = 88;

  // SoftAP event list tracking sessions and client counts in tethered mode
  repeated SoftApConnectedClientsEvent soft_ap_connected_clients_events_tethered = 89;

  // SoftAP event list tracking sessions and client counts in local only mode
  repeated SoftApConnectedClientsEvent soft_ap_connected_clients_events_local_only = 90;

  // Wps connection metrics
  optional WpsMetrics wps_metrics = 91;

  // Wifi power statistics
  optional WifiPowerStats wifi_power_stats = 92;

  // Number of connectivity single scan requests.
  optional int32 num_connectivity_oneshot_scans = 93;

  // WifiWake statistics
  optional WifiWakeStats wifi_wake_stats = 94;

  // Histogram counting instances of scans with N many 802.11mc (RTT) supporting APs
  repeated NumConnectableNetworksBucket observed_80211mc_supporting_aps_in_scan_histogram = 95;

  // Total number of times supplicant crashed.
  optional int32 num_supplicant_crashes = 96;

  // Total number of times hostapd crashed.
  optional int32 num_hostapd_crashes = 97;

  // Indicates the number of times an error was encountered in
  // supplicant on |WifiNative.setupInterfaceForClientMode|.
  optional int32 num_setup_client_interface_failure_due_to_supplicant = 98;

  // Indicates the number of times an error was encountered in
  // Wifi HAL on |WifiNative.setupInterfaceForSoftApMode|.
  optional int32 num_setup_soft_ap_interface_failure_due_to_hal = 99;

  // Indicates the number of times an error was encountered in
  // Wifi HAL on |WifiNative.setupInterfaceForSoftApMode|.
  optional int32 num_setup_soft_ap_interface_failure_due_to_wificond = 100;

  // Indicates the number of times an error was encountered in
  // Wifi HAL on |WifiNative.setupInterfaceForSoftApMode|.
  optional int32 num_setup_soft_ap_interface_failure_due_to_hostapd = 101;

  // Indicates the number of times we got an interface down in client mode.
  optional int32 num_client_interface_down = 102;

  // Indicates the number of times we got an interface down in softap mode.
  optional int32 num_soft_ap_interface_down = 103;

  // Indicates the number of scan requests from external apps.
  optional int32 num_external_app_oneshot_scan_requests = 104;

  // Indicates the number of times a scan request from an external foreground app was throttled.
  optional int32 num_external_foreground_app_oneshot_scan_requests_throttled = 105;

  // Indicates the number of times a scan request from an external background app was throttled.
  optional int32 num_external_background_app_oneshot_scan_requests_throttled = 106;

  // WifiLastResortWatchdog time milliseconds delta between trigger and first connection success
  optional int64 watchdog_trigger_to_connection_success_duration_ms = 107 [default = -1];

  // The number of times wifi experienced failures after watchdog has already been triggered and is
  // waiting for a connection success
  optional int64 watchdog_total_connection_failure_count_after_trigger = 108;

  // Number of times DFS channel scans are requested in single scan requests.
  optional int32 num_oneshot_has_dfs_channel_scans = 109;

  // Wi-Fi RTT metrics
  optional WifiRttLog wifi_rtt_log = 110;

  // Flag which indicates if Connected MAC Randomization is enabled
  optional bool is_mac_randomization_on = 111 [default = false];

  // Number of radio mode changes to MCC (Multi channel concurrency).
  optional int32 num_radio_mode_change_to_mcc = 112;

  // Number of radio mode changes to SCC (Single channel concurrency).
  optional int32 num_radio_mode_change_to_scc = 113;

  // Number of radio mode changes to SBS (Single band simultaneous).
  optional int32 num_radio_mode_change_to_sbs = 114;

  // Number of radio mode changes to DBS (Dual band simultaneous).
  optional int32 num_radio_mode_change_to_dbs = 115;

  // Number of times the firmware picked a SoftAp channel not satisfying user band preference.
  optional int32 num_soft_ap_user_band_preference_unsatisfied = 116;

  // Identifier for experimental scoring parameter settings.
  optional string score_experiment_id = 117;

}

// Information that gets logged for every WiFi connection.
message RouterFingerPrint {

  enum RoamType {

    // Type is unknown.
    ROAM_TYPE_UNKNOWN = 0;

    // No roaming - usually happens on a single band (2.4 GHz) router.
    ROAM_TYPE_NONE = 1;

    // Enterprise router.
    ROAM_TYPE_ENTERPRISE = 2;

    // DBDC => Dual Band Dual Concurrent essentially a router that
    // supports both 2.4 GHz and 5 GHz bands.
    ROAM_TYPE_DBDC = 3;
  }

  enum Auth {

    // Auth is unknown.
    AUTH_UNKNOWN = 0;

    // No authentication.
    AUTH_OPEN = 1;

    // If the router uses a personal authentication.
    AUTH_PERSONAL = 2;

    // If the router is setup for enterprise authentication.
    AUTH_ENTERPRISE = 3;
  }

  enum RouterTechnology {

    // Router is unknown.
    ROUTER_TECH_UNKNOWN = 0;

    // Router Channel A.
    ROUTER_TECH_A = 1;

    // Router Channel B.
    ROUTER_TECH_B = 2;

    // Router Channel G.
    ROUTER_TECH_G = 3;

    // Router Channel N.
    ROUTER_TECH_N = 4;

    // Router Channel AC.
    ROUTER_TECH_AC = 5;

    // When the channel is not one of the above.
    ROUTER_TECH_OTHER = 6;
  }

  optional RoamType roam_type = 1;

  // Channel on which the connection takes place.
  optional int32 channel_info = 2;

  // DTIM setting of the router.
  optional int32 dtim = 3;

  // Authentication scheme of the router.
  optional Auth authentication = 4;

  // If the router is hidden.
  optional bool hidden = 5;

  // Channel information.
  optional RouterTechnology router_technology = 6;

  // whether ipv6 is supported.
  optional bool supports_ipv6 = 7;

  // If the router is a passpoint / hotspot 2.0 network
  optional bool passpoint = 8;
}

message ConnectionEvent {

  // Roam Type.
  enum RoamType {

    // Type is unknown.
    ROAM_UNKNOWN = 0;

    // No roaming.
    ROAM_NONE  = 1;

    // DBDC roaming.
    ROAM_DBDC = 2;

    // Enterprise roaming.
    ROAM_ENTERPRISE = 3;

    // User selected roaming.
    ROAM_USER_SELECTED = 4;

    // Unrelated.
    ROAM_UNRELATED = 5;
  }

  // Connectivity Level Failure.
  enum ConnectivityLevelFailure {

    // Failure is unknown.
    HLF_UNKNOWN = 0;

    // No failure.
    HLF_NONE = 1;

    // DHCP failure.
    HLF_DHCP = 2;

    // No internet connection.
    HLF_NO_INTERNET = 3;

    // No internet connection.
    HLF_UNWANTED = 4;
  }

  // Start time of the connection.
  optional int64 start_time_millis = 1;// [(datapol.semantic_type) = ST_TIMESTAMP];

  // Duration to connect.
  optional int32 duration_taken_to_connect_millis = 2;

  // Router information.
  optional RouterFingerPrint router_fingerprint = 3;

  // RSSI at the start of the connection.
  optional int32 signal_strength = 4;

  // Roam Type.
  optional RoamType roam_type = 5;

  // Result of the connection.
  optional int32 connection_result = 6;

  // Reasons for level 2 failure (needs to be coordinated with wpa-supplicant).
  optional int32 level_2_failure_code = 7;

  // Failures that happen at the connectivity layer.
  optional ConnectivityLevelFailure connectivity_level_failure_code = 8;

  // Has bug report been taken.
  optional bool automatic_bug_report_taken = 9;
}

// Number of occurrences of a specific RSSI poll rssi value
message RssiPollCount {
  // RSSI
  optional int32 rssi = 1;

  // Number of RSSI polls with 'rssi'
  optional int32 count = 2;
}

// Number of occurrences of a specific alert reason value
message AlertReasonCount {
  // Alert reason
  optional int32 reason = 1;

  // Number of alerts with |reason|.
  optional int32 count = 2;
}

// Counts the number of instances of a specific Wifi Score calculated by WifiScoreReport
message WifiScoreCount {
  // Wifi Score
  optional int32 score = 1;

  // Number of Wifi score reports with this score
  optional int32 count = 2;
}

// Number of occurrences of Soft AP session durations
message SoftApDurationBucket {
  // Bucket covers duration : [duration_sec, duration_sec + bucket_size_sec)
  // The (inclusive) lower bound of Soft AP session duration represented by this bucket
  optional int32 duration_sec = 1;

  // The size of this bucket
  optional int32 bucket_size_sec = 2;

  // Number of soft AP session durations that fit into this bucket
  optional int32 count = 3;
}

// Number of occurrences of a soft AP session return code
message SoftApReturnCodeCount {

  enum SoftApStartResult {

    // SoftApManager return code unknown
    SOFT_AP_RETURN_CODE_UNKNOWN = 0;

    // SoftAp started successfully
    SOFT_AP_STARTED_SUCCESSFULLY = 1;

    // Catch all for failures with no specific failure reason
    SOFT_AP_FAILED_GENERAL_ERROR = 2;

    // SoftAp failed to start due to NO_CHANNEL error
    SOFT_AP_FAILED_NO_CHANNEL = 3;
  }

  // Historical, no longer used for writing as of 01/2017.
  optional int32 return_code = 1 [deprecated = true];

  // Occurrences of this soft AP return code
  optional int32 count = 2;

  // Result of attempt to start SoftAp
  optional SoftApStartResult start_result = 3;
}

message StaEvent {
  message ConfigInfo {
    // The set of key management protocols supported by this configuration.
    optional uint32 allowed_key_management = 1 [default = 0];

    // The set of security protocols supported by this configuration.
    optional uint32 allowed_protocols = 2 [default = 0];

    // The set of authentication protocols supported by this configuration.
    optional uint32 allowed_auth_algorithms = 3 [default = 0];

    // The set of pairwise ciphers for WPA supported by this configuration.
    optional uint32 allowed_pairwise_ciphers = 4 [default = 0];

    // The set of group ciphers supported by this configuration.
    optional uint32 allowed_group_ciphers = 5;

    // Is this a 'hidden network'
    optional bool hidden_ssid = 6;

    // Is this a Hotspot 2.0 / passpoint network
    optional bool is_passpoint = 7;

    // Is this an 'ephemeral' network (Not in saved network list, recommended externally)
    optional bool is_ephemeral = 8;

    // Has a successful connection ever been established using this WifiConfiguration
    optional bool has_ever_connected = 9;

    // RSSI of the scan result candidate associated with this WifiConfiguration
    optional int32 scan_rssi = 10 [default = -127];

    // Frequency of the scan result candidate associated with this WifiConfiguration
    optional int32 scan_freq = 11 [default = -1];
  }

  enum EventType {
    // Default/Invalid event
    TYPE_UNKNOWN = 0;

    // Supplicant Association Rejection event. Code contains the 802.11
    TYPE_ASSOCIATION_REJECTION_EVENT = 1;

    // Supplicant L2 event,
    TYPE_AUTHENTICATION_FAILURE_EVENT = 2;

    // Supplicant L2 event
    TYPE_NETWORK_CONNECTION_EVENT = 3;

    // Supplicant L2 event
    TYPE_NETWORK_DISCONNECTION_EVENT = 4;

    // Supplicant L2 event
    TYPE_SUPPLICANT_STATE_CHANGE_EVENT = 5;

    // Supplicant L2 event
    TYPE_CMD_ASSOCIATED_BSSID = 6;

    // IP Manager successfully completed IP Provisioning
    TYPE_CMD_IP_CONFIGURATION_SUCCESSFUL = 7;

    // IP Manager failed to complete IP Provisioning
    TYPE_CMD_IP_CONFIGURATION_LOST = 8;

    // IP Manager lost reachability to network neighbors
    TYPE_CMD_IP_REACHABILITY_LOST = 9;

    // Indicator that Supplicant is targeting a BSSID for roam/connection
    TYPE_CMD_TARGET_BSSID = 10;

    // Wifi framework is initiating a connection attempt
    TYPE_CMD_START_CONNECT = 11;

    // Wifi framework is initiating a roaming connection attempt
    TYPE_CMD_START_ROAM = 12;

    // SystemAPI connect() command, Settings App
    TYPE_CONNECT_NETWORK = 13;

    // Network Agent has validated the internet connection (Captive Portal Check success, or user
    // validation)
    TYPE_NETWORK_AGENT_VALID_NETWORK = 14;

    // Framework initiated disconnect. Sometimes generated to give an extra reason for a disconnect
    // Should typically be followed by a NETWORK_DISCONNECTION_EVENT with a local_gen = true
    TYPE_FRAMEWORK_DISCONNECT = 15;

    // The NetworkAgent score for wifi has changed in a way that may impact
    // connectivity
    TYPE_SCORE_BREACH = 16;

    // Framework changed Sta interface MAC address
    TYPE_MAC_CHANGE = 17;
  }

  enum FrameworkDisconnectReason {
    // default/none/unknown value
    DISCONNECT_UNKNOWN = 0;

    // API DISCONNECT
    DISCONNECT_API = 1;

    // Some framework internal reason (generic)
    DISCONNECT_GENERIC = 2;

    // Network Agent network validation failed, user signaled network unwanted
    DISCONNECT_UNWANTED = 3;

    // Roaming timed out
    DISCONNECT_ROAM_WATCHDOG_TIMER = 4;

    // P2P service requested wifi disconnect
    DISCONNECT_P2P_DISCONNECT_WIFI_REQUEST = 5;

    // SIM was removed while using a SIM config
    DISCONNECT_RESET_SIM_NETWORKS = 6;
  }

  // Authentication Failure reasons as reported through the API.
  enum AuthFailureReason {
    // Unknown default
    AUTH_FAILURE_UNKNOWN = 0;

    // The reason code if there is no error during authentication. It could also imply that there no
    // authentication in progress,
    AUTH_FAILURE_NONE = 1;

    // The reason code if there was a timeout authenticating.
    AUTH_FAILURE_TIMEOUT = 2;

    // The reason code if there was a wrong password while authenticating.
    AUTH_FAILURE_WRONG_PSWD = 3;

    // The reason code if there was EAP failure while authenticating.
    AUTH_FAILURE_EAP_FAILURE = 4;
  }

  // What event was this
  optional EventType type = 1;

  // 80211 death reason code, relevant to NETWORK_DISCONNECTION_EVENTs
  optional int32 reason = 2 [default = -1];

  // 80211 Association Status code, relevant to ASSOCIATION_REJECTION_EVENTs
  optional int32 status = 3 [default = -1];

  // Designates whether a NETWORK_DISCONNECT_EVENT was by the STA or AP
  optional bool local_gen = 4 [default = false];

  // Network information from the WifiConfiguration of a framework initiated connection attempt
  optional ConfigInfo config_info = 5;

  // RSSI from the last rssi poll (Only valid for active connections)
  optional int32 last_rssi = 6 [default = -127];

  // Link speed from the last rssi poll (Only valid for active connections)
  optional int32 last_link_speed = 7 [default = -1];

  // Frequency from the last rssi poll (Only valid for active connections)
  optional int32 last_freq = 8 [default = -1];

  // Enum used to define bit positions in the supplicant_state_change_bitmask
  // See {@code frameworks/base/wifi/java/android/net/wifi/SupplicantState.java} for documentation
  enum SupplicantState {
    STATE_DISCONNECTED = 0;

    STATE_INTERFACE_DISABLED = 1;

    STATE_INACTIVE = 2;

    STATE_SCANNING = 3;

    STATE_AUTHENTICATING = 4;

    STATE_ASSOCIATING = 5;

    STATE_ASSOCIATED = 6;

    STATE_FOUR_WAY_HANDSHAKE = 7;

    STATE_GROUP_HANDSHAKE = 8;

    STATE_COMPLETED = 9;

    STATE_DORMANT = 10;

    STATE_UNINITIALIZED = 11;

    STATE_INVALID = 12;
  }

  // Bit mask of all supplicant state changes that occured since the last event
  optional uint32 supplicant_state_changes_bitmask = 9 [default = 0];

  // The number of milliseconds that have elapsed since the device booted
  optional int64 start_time_millis = 10 [default = 0];

  optional FrameworkDisconnectReason framework_disconnect_reason = 11 [default = DISCONNECT_UNKNOWN];

  // Flag which indicates if an association rejection event occured due to a timeout
  optional bool association_timed_out = 12 [default = false];

  // Authentication failure reason, as reported by WifiManager (calculated from state & deauth code)
  optional AuthFailureReason auth_failure_reason = 13 [default = AUTH_FAILURE_UNKNOWN];

  // NetworkAgent score of connected wifi
  optional int32 last_score = 14 [default = -1];
}

// Wi-Fi Aware metrics
message WifiAwareLog {
  // total number of unique apps that used Aware (measured on attach)
  optional int32 num_apps = 1;

  // total number of unique apps that used an identity callback when attaching
  optional int32 num_apps_using_identity_callback = 2;

  // maximum number of attaches for an app
  optional int32 max_concurrent_attach_sessions_in_app = 3;

  // histogram of attach request results
  repeated NanStatusHistogramBucket histogram_attach_session_status = 4;

  // maximum number of concurrent publish sessions in a single app
  optional int32 max_concurrent_publish_in_app = 5;

  // maximum number of concurrent subscribe sessions in a single app
  optional int32 max_concurrent_subscribe_in_app = 6;

  // maximum number of concurrent discovery (publish+subscribe) sessions in a single app
  optional int32 max_concurrent_discovery_sessions_in_app = 7;

  // maximum number of concurrent publish sessions in the system
  optional int32 max_concurrent_publish_in_system = 8;

  // maximum number of concurrent subscribe sessions in the system
  optional int32 max_concurrent_subscribe_in_system = 9;

  // maximum number of concurrent discovery (publish+subscribe) sessions in the system
  optional int32 max_concurrent_discovery_sessions_in_system = 10;

  // histogram of publish request results
  repeated NanStatusHistogramBucket histogram_publish_status = 11;

  // histogram of subscribe request results
  repeated NanStatusHistogramBucket histogram_subscribe_status = 12;

  // number of unique apps which experienced a discovery session creation failure due to lack of
  // resources
  optional int32 num_apps_with_discovery_session_failure_out_of_resources = 13;

  // histogram of create ndp request results
  repeated NanStatusHistogramBucket histogram_request_ndp_status = 14;

  // histogram of create ndp out-of-band (OOB) request results
  repeated NanStatusHistogramBucket histogram_request_ndp_oob_status = 15;

  // maximum number of concurrent active data-interfaces (NDI) in a single app
  optional int32 max_concurrent_ndi_in_app = 19;

  // maximum number of concurrent active data-interfaces (NDI) in the system
  optional int32 max_concurrent_ndi_in_system = 20;

  // maximum number of concurrent data-paths (NDP) in a single app
  optional int32 max_concurrent_ndp_in_app = 21;

  // maximum number of concurrent data-paths (NDP) in the system
  optional int32 max_concurrent_ndp_in_system = 22;

  // maximum number of concurrent secure data-paths (NDP) in a single app
  optional int32 max_concurrent_secure_ndp_in_app = 23;

  // maximum number of concurrent secure data-paths (NDP) in the system
  optional int32 max_concurrent_secure_ndp_in_system = 24;

  // maximum number of concurrent data-paths (NDP) per data-interface (NDI)
  optional int32 max_concurrent_ndp_per_ndi = 25;

  // histogram of durations of Aware being available
  repeated HistogramBucket histogram_aware_available_duration_ms = 26;

  // histogram of durations of Aware being enabled
  repeated HistogramBucket histogram_aware_enabled_duration_ms = 27;

  // histogram of duration (in ms) of attach sessions
  repeated HistogramBucket histogram_attach_duration_ms = 28;

  // histogram of duration (in ms) of publish sessions
  repeated HistogramBucket histogram_publish_session_duration_ms = 29;

  // histogram of duration (in ms) of subscribe sessions
  repeated HistogramBucket histogram_subscribe_session_duration_ms = 30;

  // histogram of duration (in ms) of data-paths (NDP)
  repeated HistogramBucket histogram_ndp_session_duration_ms = 31;

  // histogram of usage (in MB) of data-paths (NDP)
  repeated HistogramBucket histogram_ndp_session_data_usage_mb = 32;

  // histogram of usage (in MB) of data-path creation time (in ms) measured as request -> confirm
  repeated HistogramBucket histogram_ndp_creation_time_ms = 33;

  // statistics for data-path (NDP) creation time (in ms) measured as request -> confirm: minimum
  optional int64 ndp_creation_time_ms_min = 34;

  // statistics for data-path (NDP) creation time (in ms) measured as request -> confirm: maximum
  optional int64 ndp_creation_time_ms_max = 35;

  // statistics for data-path (NDP) creation time (in ms) measured as request -> confirm: sum
  optional int64 ndp_creation_time_ms_sum = 36;

  // statistics for data-path (NDP) creation time (in ms) measured as request -> confirm: sum of sq
  optional int64 ndp_creation_time_ms_sum_of_sq = 37;

  // statistics for data-path (NDP) creation time (in ms) measured as request -> confirm: number of
  // samples
  optional int64 ndp_creation_time_ms_num_samples = 38;

  // total time within the logging window that aware was available
  optional int64 available_time_ms = 39;

  // total time within the logging window that aware was enabled
  optional int64 enabled_time_ms = 40;

  // maximum number of concurrent publish sessions enabling ranging in a single app
  optional int32 max_concurrent_publish_with_ranging_in_app = 41;

  // maximum number of concurrent subscribe sessions specifying a geofence in a single app
  optional int32 max_concurrent_subscribe_with_ranging_in_app = 42;

  // maximum number of concurrent publish sessions enabling ranging in the system
  optional int32 max_concurrent_publish_with_ranging_in_system = 43;

  // maximum number of concurrent subscribe sessions specifying a geofence in the system
  optional int32 max_concurrent_subscribe_with_ranging_in_system = 44;

  // histogram of subscribe session geofence minimum (only when specified)
  repeated HistogramBucket histogram_subscribe_geofence_min = 45;

  // histogram of subscribe session geofence maximum (only when specified)
  repeated HistogramBucket histogram_subscribe_geofence_max = 46;

  // total number of subscribe sessions which enabled ranging
  optional int32 num_subscribes_with_ranging = 47;

  // total number of matches (service discovery indication) with ranging provided
  optional int32 num_matches_with_ranging = 48;

  // total number of matches (service discovery indication) for service discovery with ranging
  // enabled which did not trigger ranging
  optional int32 num_matches_without_ranging_for_ranging_enabled_subscribes = 49;

  // Histogram bucket for Wi-Fi Aware logs. Range is [start, end)
  message HistogramBucket {
    // lower range of the bucket (inclusive)
    optional int64 start = 1;

    // upper range of the bucket (exclusive)
    optional int64 end = 2;

    // number of samples in the bucket
    optional int32 count = 3;
  }

  // Status of various NAN operations
  enum NanStatusTypeEnum {
    // constant to be used by proto
    UNKNOWN = 0;

    // NAN operation succeeded
    SUCCESS = 1;

    // NAN Discovery Engine/Host driver failures
    INTERNAL_FAILURE = 2;

    // NAN OTA failures
    PROTOCOL_FAILURE = 3;

    // The publish/subscribe discovery session id is invalid
    INVALID_SESSION_ID = 4;

    // Out of resources to fufill request
    NO_RESOURCES_AVAILABLE = 5;

    // Invalid arguments passed
    INVALID_ARGS = 6;

    // Invalid peer id
    INVALID_PEER_ID = 7;

    // Invalid NAN data-path (ndp) id
    INVALID_NDP_ID = 8;

    // Attempting to enable NAN when not available, e.g. wifi is disabled
    NAN_NOT_ALLOWED = 9;

    // Over the air ACK not received
    NO_OTA_ACK = 10;

    // Attempting to enable NAN when already enabled
    ALREADY_ENABLED = 11;

    // Can't queue tx followup message foor transmission
    FOLLOWUP_TX_QUEUE_FULL = 12;

    // Unsupported concurrency of NAN and another feature - NAN disabled
    UNSUPPORTED_CONCURRENCY_NAN_DISABLED = 13;

    // Unknown NanStatusType
    UNKNOWN_HAL_STATUS = 14;
  }

  // Histogram bucket for Wi-Fi Aware (NAN) status.
  message NanStatusHistogramBucket {
    // status type defining the bucket
    optional NanStatusTypeEnum nan_status_type = 1;

    // number of samples in the bucket
    optional int32 count = 2;
  }
}

// Data point used to build 'Number of Connectable Network' histograms
message NumConnectableNetworksBucket {
  // Number of connectable networks seen in a scan result
  optional int32 num_connectable_networks = 1 [default = 0];

  // Number of scan results with num_connectable_networks
  optional int32 count = 2 [default = 0];
}

// Pno scan metrics
// Here "Pno Scan" refers to the session of offloaded scans, these metrics count the result of a
// single session, and not the individual scans within that session.
message PnoScanMetrics {
  // Total number of attempts to offload pno scans
  optional int32 num_pno_scan_attempts = 1;

  // Total number of pno scans failed
  optional int32 num_pno_scan_failed = 2;

  // Number of pno scans started successfully over offload
  optional int32 num_pno_scan_started_over_offload = 3;

  // Number of pno scans failed over offload
  optional int32 num_pno_scan_failed_over_offload = 4;

  // Total number of pno scans that found any network
  optional int32 num_pno_found_network_events = 5;
}

// Number of occurrences for a particular "Connect to Network" Notification or
// notification Action.
message ConnectToNetworkNotificationAndActionCount {

  // "Connect to Network" notifications
  enum Notification {

    // Default
    NOTIFICATION_UNKNOWN = 0;

    // Initial notification with a recommended network.
    NOTIFICATION_RECOMMEND_NETWORK = 1;

    // Notification when connecting to the recommended network.
    NOTIFICATION_CONNECTING_TO_NETWORK = 2;

    // Notification when successfully connected to the network.
    NOTIFICATION_CONNECTED_TO_NETWORK = 3;

    // Notification when failed to connect to network.
    NOTIFICATION_FAILED_TO_CONNECT = 4;
  }

  // "Connect to Network" notification actions
  enum Action {

    // Default
    ACTION_UNKNOWN = 0;

    // User dismissed the "Connect to Network" notification.
    ACTION_USER_DISMISSED_NOTIFICATION = 1;

    // User tapped action button to connect to recommended network.
    ACTION_CONNECT_TO_NETWORK = 2;

    // User tapped action button to open Wi-Fi Settings.
    ACTION_PICK_WIFI_NETWORK = 3;

    // User tapped "Failed to connect" notification to open Wi-Fi Settings.
    ACTION_PICK_WIFI_NETWORK_AFTER_CONNECT_FAILURE = 4;
  }

  // Recommenders of the "Connect to Network" notification
  enum Recommender {

    // Default.
    RECOMMENDER_UNKNOWN = 0;

    // Open Network Available recommender.
    RECOMMENDER_OPEN = 1;
  }

  // Notification Type.
  optional Notification notification = 1;

  // Action Type.
  optional Action action = 2;

  // Recommender Type.
  optional Recommender recommender = 3;

  // Occurrences of this action.
  optional int32 count = 4;
}

// SoftAP event tracking sessions and client counts
message SoftApConnectedClientsEvent {

  // Soft AP event Types
  enum SoftApEventType {

    // Soft AP is Up and ready for use
    SOFT_AP_UP = 0;

    // Soft AP is Down
    SOFT_AP_DOWN = 1;

    // Number of connected soft AP clients has changed
    NUM_CLIENTS_CHANGED = 2;
  }

  // Soft AP channel bandwidth types
  enum ChannelBandwidth {

    BANDWIDTH_INVALID = 0;

    BANDWIDTH_20_NOHT = 1;

    BANDWIDTH_20 = 2;

    BANDWIDTH_40 = 3;

    BANDWIDTH_80 = 4;

    BANDWIDTH_80P80 = 5;

    BANDWIDTH_160 = 6;
  }

  // Type of event being recorded
  optional SoftApEventType event_type = 1;

  // Time passed since last boot in milliseconds
  optional int64 time_stamp_millis = 2;

  // Number of connected clients if event_type is NUM_CLIENTS_CHANGED, otherwise zero.
  optional int32 num_connected_clients = 3;

  // Channel frequency used for Soft AP
  optional int32 channel_frequency = 4;

  // Channel bandwidth used for Soft AP
  optional ChannelBandwidth channel_bandwidth = 5;
}

// Wps connection metrics
// Keeps track of Wi-Fi Protected Setup usage
message WpsMetrics {
  // Total number of wps connection attempts
  optional int32 num_wps_attempts = 1;

  // Total number of wps connection successes
  optional int32 num_wps_success = 2;

  // Total number of wps failures on start
  optional int32 num_wps_start_failure = 3;

  // Total number of wps overlap failure
  optional int32 num_wps_overlap_failure = 4;

  // Total number of wps timeout failure
  optional int32 num_wps_timeout_failure = 5;

  // Total number of other wps failure during connection
  optional int32 num_wps_other_connection_failure = 6;

  // Total number of supplicant failure after wps
  optional int32 num_wps_supplicant_failure = 7;

  // Total number of wps cancellation
  optional int32 num_wps_cancellation = 8;
}

// Power stats for Wifi
message WifiPowerStats {

  // Duration of log (ms)
  optional int64 logging_duration_ms = 1;

  // Energy consumed by wifi (mAh)
  optional double energy_consumed_mah = 2;

  // Amount of time wifi is in idle (ms)
  optional int64 idle_time_ms = 3;

  // Amount of time wifi is in rx (ms)
  optional int64 rx_time_ms = 4;

  // Amount of time wifi is in tx (ms)
  optional int64 tx_time_ms = 5;
}

// Metrics for Wifi Wake
message WifiWakeStats {
  // An individual session for Wifi Wake
  message Session {
    // A Wifi Wake lifecycle event
    message Event {
      // Elapsed time in milliseconds since start of session.
      optional int64 elapsed_time_millis = 1;

      // Number of scans that have occurred since start of session.
      optional int32 elapsed_scans = 2;
    }

    // Start time of session in milliseconds.
    optional int64 start_time_millis = 1;

    // The number of networks the lock was provided with at start.
    optional int32 locked_networks_at_start = 2;

    // The number of networks in the lock at the time of the initialize event. Only valid if
    // initialize_event is recorded.
    optional int32 locked_networks_at_initialize = 6;

    // Event for fully initializing the WakeupLock (i.e. WakeupLock is "locked").
    optional Event initialize_event = 7;

    // Event for unlocking the WakeupLock. Does not occur if lock was initialized with 0 networks.
    optional Event unlock_event = 3;

    // Event for triggering wakeup.
    optional Event wakeup_event = 4;

    // Event for WifiWake reset event. This event marks the end of a session.
    optional Event reset_event = 5;
  }

  // Total number of sessions for Wifi Wake.
  optional int32 num_sessions = 1;

  // Session information for every Wifi Wake session (up to a maximum of 10).
  repeated Session sessions = 2;

  // Number of ignored calls to start (due to WakeupController already being active).
  optional int32 num_ignored_starts = 3;

  // Number of Wifi Wake sessions that have recorded wakeup events.
  optional int32 num_wakeups = 4;
}

// Metrics for Wi-Fi RTT
message WifiRttLog {
  // Number of RTT request API calls
  optional int32 num_requests = 1;

  // Histogram of RTT operation overall status
  repeated RttOverallStatusHistogramBucket histogram_overall_status = 2;

  // RTT to Access Points metrics
  optional RttToPeerLog rtt_to_ap = 3;

  // RTT to Wi-Fi Aware peers metrics
  optional RttToPeerLog rtt_to_aware = 4;

  // Metrics for a RTT to Peer (peer = AP or Wi-Fi Aware)
  message RttToPeerLog {
    // Total number of API calls
    optional int32 num_requests = 1;

    // Total number of individual requests
    optional int32 num_individual_requests = 2;

    // Total number of apps which requested RTT
    optional int32 num_apps = 3;

    // Histogram of total number of RTT requests by an app (WifiRttManager#startRanging)
    repeated HistogramBucket histogram_num_requests_per_app = 4;

    // Histogram of number of peers in a single RTT request (RangingRequest entries)
    repeated HistogramBucket histogram_num_peers_per_request = 5;

    // Histogram of status of individual RTT operations (RangingResult entries)
    repeated RttIndividualStatusHistogramBucket histogram_individual_status = 6;

    // Histogram of measured distances (RangingResult entries)
    repeated HistogramBucket histogram_distance = 7;

    // Histogram of interval of RTT requests by an app (WifiRttManager#startRanging)
    repeated HistogramBucket histogram_request_interval_ms = 8;
  }

    // Histogram bucket for Wi-Fi RTT logs. Range is [start, end)
  message HistogramBucket {
    // lower range of the bucket (inclusive)
    optional int64 start = 1;

    // upper range of the bucket (exclusive)
    optional int64 end = 2;

    // number of samples in the bucket
    optional int32 count = 3;
  }

  // Status codes for overall RTT operation
  enum RttOverallStatusTypeEnum {
    // constant to be used by proto
    OVERALL_UNKNOWN = 0;

    // RTT operation succeeded (individual results may still fail)
    OVERALL_SUCCESS = 1;

    // RTT operation failed (unspecified reason)
    OVERALL_FAIL = 2;

    // RTT operation failed since RTT was not available (e.g. Airplane mode)
    OVERALL_RTT_NOT_AVAILABLE = 3;

    // RTT operation timed-out: didn't receive response from HAL in expected time
    OVERALL_TIMEOUT = 4;

    // RTT operation aborted since the app is spamming the service
    OVERALL_THROTTLE = 5;

    // RTT request to HAL received immediate failure
    OVERALL_HAL_FAILURE = 6;

    // RTT to Wi-Fi Aware peer using PeerHandle failed to get a MAC address translation
    OVERALL_AWARE_TRANSLATION_FAILURE = 7;

    // RTT operation failed due to missing Location permission (post execution)
    OVERALL_LOCATION_PERMISSION_MISSING = 8;
  }

  // Status codes for individual RTT operation
  enum RttIndividualStatusTypeEnum {
    // constant to be used by proto
    UNKNOWN = 0;

    // RTT operation succeeded
    SUCCESS = 1;

    // RTT failure: generic reason (no further information)
    FAILURE = 2;

    // Target STA does not respond to request
    FAIL_NO_RSP = 3;

    // Request rejected. Applies to 2-sided RTT only
    FAIL_REJECTED = 4;

    // Operation not scheduled
    FAIL_NOT_SCHEDULED_YET = 5;

    // Timing measurement times out
    FAIL_TM_TIMEOUT = 6;

    // Target on different channel, cannot range
    FAIL_AP_ON_DIFF_CHANNEL = 7;

    // Ranging not supported
    FAIL_NO_CAPABILITY = 8;

    // Request aborted for unknown reason
    ABORTED = 9;

    // Invalid T1-T4 timestamp
    FAIL_INVALID_TS = 10;

    // 11mc protocol failed
    FAIL_PROTOCOL = 11;

    // Request could not be scheduled
    FAIL_SCHEDULE = 12;

    // Responder cannot collaborate at time of request
    FAIL_BUSY_TRY_LATER = 13;

    // Bad request args
    INVALID_REQ = 14;

    // WiFi not enabled
    NO_WIFI = 15;

    // Responder overrides param info, cannot range with new params
    FAIL_FTM_PARAM_OVERRIDE = 16;

    // HAL did not provide a result to a framework request
    MISSING_RESULT = 17;
  }

  // Histogram bucket for Wi-Fi RTT overall operation status
  message RttOverallStatusHistogramBucket {
    // status type defining the bucket
    optional RttOverallStatusTypeEnum status_type = 1;

    // number of samples in the bucket
    optional int32 count = 2;
  }

  // Histogram bucket for Wi-Fi RTT individual operation status
  message RttIndividualStatusHistogramBucket {
    // status type defining the bucket
    optional RttIndividualStatusTypeEnum status_type = 1;

    // number of samples in the bucket
    optional int32 count = 2;
  }
}