tools/metrics/histograms/metadata/chromeos/histograms.xml

<!--
Copyright 2020 The Chromium Authors. All rights reserved.
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
-->

<!--
This file is used to generate a comprehensive list of Chrome OS histograms along
with a detailed description for each histogram.

For best practices on writing histogram descriptions, see
https://chromium.googlesource.com/chromium/src.git/+/HEAD/tools/metrics/histograms/README.md

Prefer owners from the OWNERS file in this directory. If you need a metrics
reviewer, please send CLs to chromium-metrics-reviews@google.com rather than to
specific individuals. These CLs will be automatically reassigned to a reviewer
within about 5 minutes. This approach helps the metrics team to load-balance
incoming reviews. Googlers can read more about this at go/gwsq-gerrit.
-->

<histogram-configuration>

<histograms>

<variants name="FeaturesLoggingUsageEvents">
<!-- The variants are names of Chrome OS features. These are used for the
  ChromeOS.FeatureUsage.* histograms to record different events related to the
  feature -->

  <variant name="ClamshellLauncher" summary="app launcher in clamshell mode">
    <owner>jamescook@chromium.org</owner>
    <owner>tbarzic@chromium.org</owner>
    <owner>chromeos-launcher@google.com</owner>
  </variant>
  <variant name="DiagnosticsUi" summary="CROS Diagnostics Application">
    <owner>jimmyxgong@chromium.org</owner>
    <owner>zentaro@chromium.org</owner>
    <owner>cros-peripherals@google.com</owner>
  </variant>
  <variant name="ESim" summary="esim">
    <owner>azeemarshad@chromium.org</owner>
    <owner>cros-connectivity@google.com</owner>
    <owner>hsuregan@chromium.org</owner>
  </variant>
  <variant name="FastPair" summary="Fast Pair">
    <owner>shanefitz@google.com</owner>
    <owner>julietlevesque@google.com</owner>
    <owner>chromeos-cross-device-eng@google.com</owner>
  </variant>
  <variant name="Fingerprint" summary="fingerprint">
    <owner>rsorokin@chromium.org</owner>
    <owner>tomhughes@chromium.org</owner>
    <owner>cros-oac@google.com</owner>
    <owner>chromeos-fingerprint@google.com</owner>
  </variant>
  <variant name="LockOnSuspend" summary="lock screen on device suspend">
    <owner>rsorokin@chromium.org</owner>
    <owner>cros-oac@google.com</owner>
  </variant>
  <variant name="NearbyShare" summary="Nearby Share">
    <owner>nohle@chromium.org</owner>
    <owner>nearby-share-chromeos-eng@google.com</owner>
  </variant>
  <variant name="NearbyShareBackgroundScanning"
      summary="Background scanning for Nearby Share to detect and notify the
               user of devices nearby that are attempting to share">
    <owner>hansenmichael@google.com</owner>
    <owner>nearby-share-chromeos-eng@google.com</owner>
  </variant>
  <variant name="NumberpadDynamicActivations"
      summary="Turning on number pad mode for a dynamic numberpad.">
    <owner>kenalba@google.com</owner>
    <owner>chromeos-tango@google.com</owner>
  </variant>
  <variant name="NumberpadDynamicCancellations"
      summary="Turning off number pad mode for a dynamic numberpad, without
               having used a number-pad key.">
    <owner>kenalba@google.com</owner>
    <owner>chromeos-tango@google.com</owner>
  </variant>
  <variant name="NumberpadDynamicEnterKeystrokes"
      summary="Pressing enter on dynamic number pad.">
    <owner>kenalba@google.com</owner>
    <owner>chromeos-tango@google.com</owner>
  </variant>
  <variant name="NumberpadDynamicNonEnterKeystrokes"
      summary="Pressing key other than enter on dynamic number pad.">
    <owner>kenalba@google.com</owner>
    <owner>chromeos-tango@google.com</owner>
  </variant>
  <variant name="NumberpadExternalEnterKeystrokes"
      summary="Pressing number pad enter on external keyboard.">
    <owner>kenalba@google.com</owner>
    <owner>chromeos-tango@google.com</owner>
  </variant>
  <variant name="NumberpadExternalNonEnterKeystrokes"
      summary="Pressing number pad key other than enter on external keyboard.">
    <owner>kenalba@google.com</owner>
    <owner>chromeos-tango@google.com</owner>
  </variant>
  <variant name="NumberpadInternalEnterKeystrokes"
      summary="Pressing enter on number pad on internal keyboard.">
    <owner>kenalba@google.com</owner>
    <owner>chromeos-tango@google.com</owner>
  </variant>
  <variant name="NumberpadInternalNonEnterKeystrokes"
      summary="Pressing number pad key other than enter on internal keyboard.">
    <owner>kenalba@google.com</owner>
    <owner>chromeos-tango@google.com</owner>
  </variant>
  <variant name="SmartLock" summary="Smart Lock">
    <owner>hansberry@chromium.org</owner>
    <owner>chromeos-cross-device-eng@google.com</owner>
  </variant>
  <variant name="StylusDetachedFromDockSession"
      summary="Time spent from stylus being undocked, to being re-docked">
    <owner>kenalba@google.com</owner>
    <owner>chromeos-tango@google.com</owner>
  </variant>
  <variant name="StylusDetachedFromGarageOrDockSession"
      summary="Time spent while either out of garage or un-docked">
    <owner>kenalba@google.com</owner>
    <owner>chromeos-tango@google.com</owner>
  </variant>
  <variant name="StylusDetachedFromGarageSession"
      summary="Time spent from stylus being removed from garage, to being
               replaced into garage">
    <owner>kenalba@google.com</owner>
    <owner>chromeos-tango@google.com</owner>
  </variant>
  <variant name="TabletLauncher" summary="app launcher in tablet mode">
    <owner>jamescook@chromium.org</owner>
    <owner>tbarzic@chromium.org</owner>
    <owner>chromeos-launcher@google.com</owner>
  </variant>
</variants>

<histogram name="ChromeOS.Apps.ExternalProtocolDialog"
    enum="ArcIntentHandlerAction" expires_after="2022-05-21">
  <owner>dominickn@chromium.org</owner>
  <owner>melzhang@chromium.org</owner>
  <owner>mxcai@chromium.org</owner>
  <summary>
    Records the response when the intent picker is shown to the user on Chrome
    OS to allow them to open an external protocol in an app.
  </summary>
</histogram>

<histogram name="ChromeOS.Apps.ExternalProtocolDialog.Accepted"
    enum="ArcExternalProtocolAction" expires_after="2022-05-21">
  <owner>dominickn@chromium.org</owner>
  <owner>melzhang@chromium.org</owner>
  <owner>mxcai@chromium.org</owner>
  <summary>
    Records the response when users that are shown the intent picker accept
    opening an external protocol in an app as well as whether the app is
    persisted.
  </summary>
</histogram>

<histogram name="ChromeOS.Apps.ExternalProtocolDialog.Rejected"
    enum="ArcExternalProtocolAction" expires_after="2022-05-21">
  <owner>dominickn@chromium.org</owner>
  <owner>melzhang@chromium.org</owner>
  <owner>mxcai@chromium.org</owner>
  <summary>
    Records the response when users that are shown the intent picker reject
    opening an external protocol in an app.
  </summary>
</histogram>

<histogram name="ChromeOS.Apps.IntentPickerAction"
    enum="ArcIntentHandlerAction" expires_after="2022-05-21">
  <obsolete>
    Replaced by ChromeOS.Intents.IntentPickerAction in M98.
  </obsolete>
  <owner>elijahtaylor@google.com</owner>
  <owner>dominickn@chromium.org</owner>
  <owner>shihuis@google.com</owner>
  <summary>
    Records the response when the intent picker is shown to the user on Chrome
    OS to allow them to open a URL in an app.
  </summary>
</histogram>

<histogram name="ChromeOS.Apps.IntentPickerDestinationPlatform"
    enum="ArcIntentHandlerDestinationPlatform" expires_after="2022-05-21">
  <owner>elijahtaylor@google.com</owner>
  <owner>dominickn@chromium.org</owner>
  <owner>shihuis@google.com</owner>
  <summary>
    Records the app platform shown as the result of link intent handling.
    Recorded when the user makes a choice in the Intent Picker dialog, and when
    the result of a previous user preference is applied during a link click.
  </summary>
</histogram>

<histogram name="ChromeOS.Apps.NumberOfAppsForNotification"
    enum="BooleanMultipleApps" expires_after="2022-07-01">
  <owner>dominickn@chromium.org</owner>
  <owner>nancylingwang@chromium.org</owner>
  <summary>
    Records whether a notification matches multiple apps, when there is one or
    multiple web apps matching a web page nonpersistent notification.
  </summary>
</histogram>

<histogram name="ChromeOS.Apps.OpenBrowser" enum="OpenBrowserType"
    expires_after="2022-05-21">
  <owner>ajlinker@chromium.org</owner>
  <owner>dominickn@chromium.org</owner>
  <owner>mxcai@chromium.org</owner>
  <summary>
    Records the type of app sending a link to the browser to be opened.
  </summary>
</histogram>

<histogram name="ChromeOS.Attestation.AttestationFlowStatus"
    enum="AttestationFlowStatus" expires_after="2021-07-31">
  <owner>cylai@chromium.org</owner>
  <owner>cros-hwsec+umas@chromium.org</owner>
  <summary>
    Records the status of attestation flow. The value represents 6 flags in 6
    rightmost bits; starting from more significant bits they mean: 1. Has proxy.
    2. Is System proxy active. 3. Run the default flow. 4. The default flow
    succeeds. 5. Run the fallback flow. 6. The fallback flow succeeds.
  </summary>
</histogram>

<histogram name="ChromeOS.Attestation.GetCertificateStatus"
    enum="AttestationStatus" expires_after="2021-07-31">
  <owner>cylai@chromium.org</owner>
  <owner>cros-hwsec+umas@chromium.org</owner>
  <summary>
    Records the status of `AttesttionClient::GetCertificate()` called by
    `AttestationFlowIntegrated`.
  </summary>
</histogram>

<histogram base="true"
    name="ChromeOS.Camera.ConfigureStreams.Output.Resolution" units="pixels"
    expires_after="2022-10-01">
<!-- Name completed by histogram_suffixes
     name="ChromeOS.Camera.StreamFormat" -->

  <owner>wtlee@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records the resolution of output stream that is configured by Chrome OS
    camera service.
  </summary>
</histogram>

<histogram name="ChromeOS.Camera.ConfigureStreamsLatency" units="microseconds"
    expires_after="2022-10-01">
  <owner>wtlee@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records the process time of ConfigureStreams() method in Chrome OS camera
    service.

    This metric is reported for all users and will not cause abnormal
    distribution since the metric is Chrome OS specified.
  </summary>
</histogram>

<histogram name="ChromeOS.Camera.ErrorType" enum="ChromeOSCameraErrorType"
    expires_after="2022-10-01">
  <owner>wtlee@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records the type of the error which triggers the Notify() method in Chrome
    OS camera service.
  </summary>
</histogram>

<histogram name="ChromeOS.Camera.FaceAutoExposure.FunctionStatus"
    enum="ChromeOSCameraFaceAutoExposureFunctionStatus"
    expires_after="2022-11-16">
  <owner>mojahsu@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records face auto exposure function status of the Chrome OS device. The
    metric is reported when the camera is detected.
  </summary>
</histogram>

<histogram name="ChromeOS.Camera.FaceAutoExposure.MaxNumDetectedFaces"
    units="faces" expires_after="2022-11-16">
  <owner>mojahsu@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records max number of detected faces of the camera session in Chrome OS
    camera service. The metric is reported when the camera is closed.
  </summary>
</histogram>

<histogram name="ChromeOS.Camera.Facing" enum="ChromeOSCameraFacing"
    expires_after="2022-10-01">
  <owner>wtlee@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records the camera facing of the camera session in Chrome OS camera service.
  </summary>
</histogram>

<histogram name="ChromeOS.Camera.GcamAutoExposure.AverageConvergenceLatency"
    units="frames" expires_after="2022-11-01">
  <owner>jcliang@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records the average auto exposure convergence latency in frame count
    throughout a camera session that runs Gcam auto exposure. Emitted when the
    camera session is closed.
  </summary>
</histogram>

<histogram name="ChromeOS.Camera.GcamAutoExposure.AverageHdrRatio"
    units="ratio" expires_after="2022-11-01">
  <owner>jcliang@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records the average HDR ratio throughout a camera session that runs Gcam
    auto exposure. Emitted when the camera session is closed.
  </summary>
</histogram>

<histogram name="ChromeOS.Camera.GcamAutoExposure.AverageTet" units="TET"
    expires_after="2022-11-01">
  <owner>jcliang@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records the average total exposure time (TET) throughout a camera session
    that runs Gcam auto exposure. Emitted when the camera session is closed.
  </summary>
</histogram>

<histogram base="true"
    name="ChromeOS.Camera.HDRnet.AverageLatency.{ProcessingType}"
    units="microseconds" expires_after="2022-11-01">
  <owner>jcliang@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records the average CPU latency in running a given type of processing
    throughout a HDRnet camera session. Emitted when the camera session is
    closed.

    This metric is reported on all ChromeOS devices with HDRnet enabled.
  </summary>
  <token key="ProcessingType">
    <variant name="Postprocessing"
        summary="Post-processing of HDRnet RGB output to final YUV output(s)"/>
    <variant name="Preprocessing"
        summary="Pre-processing of input YUV into linear RGB domain"/>
    <variant name="RgbPipeline"
        summary="Main HDRnet inferencing and rendering"/>
  </token>
</histogram>

<histogram name="ChromeOS.Camera.HDRnet.Error" enum="HdrnetError"
    expires_after="2022-11-01">
  <owner>jcliang@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records whether there's an error that can compromise the HDRnet feature,
    either causing frame drops or stops the pipeline from running completely,
    throughout a HDRnet camera session. Emitted when the camera session is
    closed.
  </summary>
</histogram>

<histogram name="ChromeOS.Camera.HDRnet.MaxOutputBuffersRendered"
    units="buffers" expires_after="2022-11-01">
  <owner>jcliang@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records the maximum number of output buffers a HDRnet stream produces
    (greater than 1 means there are multiple streams with the same aspect ratio)
    throughtout a HDRnet camera session. Emitted when the camera session is
    closed.
  </summary>
</histogram>

<histogram base="true" name="ChromeOS.Camera.HDRnet.MaxStreamSize.{StreamType}"
    units="pixels" expires_after="2022-11-01">
  <owner>jcliang@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records the maximum size (in width * height pixels) of the HDRnet stream
    configured for a given output in a HDRnet camera session. Emitted when the
    camera session is closed.
  </summary>
  <token key="StreamType">
    <variant name="BLOB" summary="HDRnet stream for BLOB output"/>
    <variant name="YUV" summary="HDRnet stream for YUV output"/>
  </token>
</histogram>

<histogram name="ChromeOS.Camera.HDRnet.NumConcurrentStreams" units="streams"
    expires_after="2022-11-01">
  <owner>jcliang@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records the number of concurrent HDRnet streams in a HDRnet camera session.
    Emitted when the camera session is closed.
  </summary>
</histogram>

<histogram name="ChromeOS.Camera.HDRnet.NumStillShotsTaken" units="captures"
    expires_after="2022-11-01">
  <owner>jcliang@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records the number of HDRnet-rendered still capture shots taken in a HDRnet
    camera session. Emitted when the camera session is closed.
  </summary>
</histogram>

<histogram name="ChromeOS.Camera.HDRnet.StreamConfiguration"
    enum="HdrnetStreamConfiguration" expires_after="2022-11-01">
  <owner>jcliang@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records the stream configuration including the number of streams, the type
    of streams, and if the streams are of the same aspect ratio in a HDRnet
    camera session. Emitted when the camera session is closed.
  </summary>
</histogram>

<histogram base="true" name="ChromeOS.Camera.Jpeg.Latency" units="microseconds"
    expires_after="2022-10-01">
<!-- Name completed by histogram_suffixes
     name="ChromeOS.Camera.JpegProcessMethod" and
     name="ChromeOS.Camera.JpegProcessType" -->

  <owner>wtlee@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records the process time of the JDA (Jpeg Decode Accelerator) or JEA (Jpeg
    Encode Accelerator) run on Chrome OS camera service. There are suffixes that
    record the runner method (hardware/software), the runner type
    (decode/encode).

    This metric is reported for all users and will not cause abnormal
    distribution since the metric is Chrome OS specified.
  </summary>
</histogram>

<histogram base="true" name="ChromeOS.Camera.Jpeg.Resolution" units="pixels"
    expires_after="2022-10-01">
<!-- Name completed by histogram_suffixes
     name="ChromeOS.Camera.JpegProcessMethod" and
     name="ChromeOS.Camera.JpegProcessType" -->

  <owner>wtlee@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records the resolution of the image that JDA/JEA process by Chrome OS camera
    service. The resolution represents by the total pixels contained in the
    image. There are suffixes that record the runner method (hardware/software),
    the runner type (decode/encode).
  </summary>
</histogram>

<histogram name="ChromeOS.Camera.OpenDeviceClientType"
    enum="ChromeOSCameraClientType" expires_after="2022-10-01">
  <owner>lnishan@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records which client type (e.g., Chrome, Android) is opening a camera
    device.
  </summary>
</histogram>

<histogram name="ChromeOS.Camera.OpenDeviceLatency" units="microseconds"
    expires_after="2022-10-01">
  <owner>wtlee@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>
    Records the process time of OpenDevice() method in Chrome OS camera service.

    This metric is reported for all users and will not cause abnormal
    distribution since the metric is Chrome OS specified.
  </summary>
</histogram>

<histogram name="ChromeOS.Camera.SessionDuration" units="seconds"
    expires_after="2022-10-01">
  <owner>wtlee@chromium.org</owner>
  <owner>chromeos-camera-eng@google.com</owner>
  <summary>Records the session duration in Chrome OS camera service.</summary>
</histogram>

<histogram name="ChromeOS.CertProvisioning.CsrSignTime" units="ms"
    expires_after="2023-02-01">
  <owner>miersh@google.com</owner>
  <owner>pmarko@chromium.org</owner>
  <summary>
    The amount of time it took the certificate provisioning worker to sign a
    CSR. Emitted after the sign is complete.
  </summary>
</histogram>

<histogram name="ChromeOS.CertProvisioning.Event" enum="CertProvisioningEvent"
    expires_after="2023-02-01">
  <owner>miersh@google.com</owner>
  <owner>pmarko@chromium.org</owner>
  <summary>
    Number of times each event is reached during the certificate provisioning
    flow.
  </summary>
</histogram>

<histogram name="ChromeOS.CertProvisioning.KeypairGenerationTime" units="ms"
    expires_after="2023-02-01">
  <owner>miersh@google.com</owner>
  <owner>pmarko@chromium.org</owner>
  <summary>
    The amount of time it took the certificate provisioning worker to generate
    one key pair. Emitted after the generation is complete.
  </summary>
</histogram>

<histogram name="ChromeOS.CertProvisioning.Result"
    enum="CertProvisioningWorkerState" expires_after="2023-02-01">
  <owner>miersh@google.com</owner>
  <owner>pmarko@chromium.org</owner>
  <summary>
    For final states (see the list in cert_provisioning::IsFinalState): number
    of times the certificate provisioning worker finished on every state. For
    other states: number of times the worker failed on every state.
  </summary>
</histogram>

<histogram name="ChromeOS.CertProvisioning.VaTime" units="ms"
    expires_after="2023-02-01">
  <owner>miersh@google.com</owner>
  <owner>pmarko@chromium.org</owner>
  <summary>
    The amount of time it took the certificate provisioning worker to build one
    Verified Access response. Emitted after the response is built.
  </summary>
</histogram>

<histogram name="ChromeOS.CWP.CollectPerf"
    enum="ChromeOSProfileCollectionStatus" expires_after="2022-05-01">
  <owner>aalexand@google.com</owner>
  <owner>gmx@chromium.org</owner>
  <owner>cwp-team@google.com</owner>
  <summary>
    A count of successes and various failure modes related to collecting and
    processing profile data obtained via &quot;perf events&quot; on Chrome OS.
  </summary>
</histogram>

<histogram name="ChromeOS.CWP.CollectProcessTypes"
    enum="ChromeOSProcessTypeCollectionStatus" expires_after="2023-01-19">
  <owner>aalexand@google.com</owner>
  <owner>cwp-team@google.com</owner>
  <summary>
    Record the collection status (success or failure) when the Chrome process
    and thread types are collected as part of the ChromeOS perf profile
    collection.
  </summary>
</histogram>

<histogram name="ChromeOS.CWP.JankinessTriggerStatus"
    enum="ChromeOSJankinessTriggerStatus" expires_after="2020-08-30">
  <owner>cywang@chromium.org</owner>
  <owner>chinglinyu@chromium.org</owner>
  <summary>
    Records the status of collection attempts triggered by jankiness on Chrome
    OS.
  </summary>
</histogram>

<histogram name="ChromeOS.CWP.ParseCPUFrequencies"
    enum="ChromeOSParseCPUFrequencyStatus" expires_after="2022-05-01">
  <owner>gmx@chromium.org</owner>
  <owner>cwp-team@google.com</owner>
  <summary>
    A count of successes and various failure modes related to the parsing of
    logical CPU frequencies on Chrome OS. Recorded when the browser process
    starts.
  </summary>
</histogram>

<histogram name="ChromeOS.CWP.ParsePSICPU" enum="ChromeOSParsePSICPUStatus"
    expires_after="2022-05-01">
  <owner>shantuo@google.com</owner>
  <owner>cwp-team@google.com</owner>
  <summary>
    A count of successes and various failure modes related to the parsing of PSI
    CPU data on Chrome OS. Recorded after each perf collection.
  </summary>
</histogram>

<histogram name="ChromeOS.CWP.ParsePSIMemory" enum="ChromeOSParsePSIMemStatus"
    expires_after="2022-06-01">
  <owner>raging@google.com</owner>
  <owner>chromeos-memory@google.com</owner>
  <summary>
    A count of successes and various failure modes related to the parsing of PSI
    Memory data on Chrome OS. Recorded after each perf collection.
  </summary>
</histogram>

<histogram name="ChromeOS.CWP.PSIMemPressure.{PType}" units="failures"
    expires_after="2022-12-01">
  <owner>raging@google.com</owner>
  <owner>chromeos-memory@google.com</owner>
  <summary>
    Reports periodic memory pressure metrics, as seen ChromeOS-wide. Metrics
    originally come from /proc/pressure/memory readings, expressed as a
    percentage with 2 decimal points (99.99%), but expressed as p*100, in an
    integer in the range (1-9999) meaning (00.01% to 99.99%). Underflow value 0
    means &quot;no pressure&quot; - 0%.
  </summary>
  <token key="PType">
    <variant name="ArcFull"
        summary="Percentage of time ARC was fully halted waiting on memory"/>
    <variant name="ArcSome"
        summary="Percentage of ARC had some blocking on memory"/>
    <variant name="Full"
        summary="Percentage of time fully halted waiting on memory operations"/>
    <variant name="Some"
        summary="Percentage of time when there was some blocking on memory"/>
  </token>
</histogram>

<histogram name="ChromeOS.CWP.RecordPerf" enum="ChromeOSProfileRecordStatus"
    expires_after="2022-12-20">
  <owner>shantuo@google.com</owner>
  <owner>cwp-team@google.com</owner>
  <summary>
    A count of the various outcomes related to recording the profile data
    collected via &quot;perf events&quot; on Chrome OS. The histogram is
    recorded when system-wide CPU profiling finishes and the collected data is
    being saved to memory for later upload.
  </summary>
</histogram>

<histogram name="ChromeOS.CWP.UploadPerf" units="reports"
    expires_after="2022-03-27">
  <owner>aalexand@google.com</owner>
  <owner>gmx@chromium.org</owner>
  <owner>cwp-team@google.com</owner>
  <summary>
    Records the number of &quot;perf events&quot; reports included in an UMA
    upload on Chrome OS.
  </summary>
</histogram>

<histogram name="ChromeOS.Debugd.Perf.{FunctionName}" units="ms"
    expires_after="2023-01-01">
  <owner>enlightened@google.com</owner>
  <owner>jorgelo@google.com</owner>
  <owner>chromeos-security-core@google.com</owner>
  <summary>
    Records the total time it takes for each call to LogTool::{FunctionName} to
    complete. Recording happens on each D-Bus call to debugd.
  </summary>
  <token key="FunctionName">
    <variant name="GetAllDebugLogs"/>
    <variant name="GetAllLogs"/>
    <variant name="GetBigFeedbackLogs"/>
  </token>
</histogram>

<histogram name="ChromeOS.DeviceSettings.FeatureFlagsMigration"
    enum="DeviceSettingsFeatureFlagsMigrationStatus" expires_after="2022-04-10">
  <owner>mnissler@chromium.org</owner>
  <owner>src/chrome/browser/ash/settings/OWNERS</owner>
  <summary>
    Migration status for Chrome OS feature flags configuration in device
    settings. This is intended to track migration progress in the field, so the
    migration code can be removed when the old approach of storing bare flags is
    no longer relevant in the field.
  </summary>
</histogram>

<histogram name="ChromeOS.DiagnosticsUi.InitialScreen"
    units="CrosDiagnosticsNavigationView" expires_after="2022-06-15">
  <owner>gavindodd@chromium.org</owner>
  <owner>zentaro@chromium.org</owner>
  <owner>cros-peripherals@google.com</owner>
  <summary>
    Records requested initial screen when opening the Diagnostics App.
  </summary>
</histogram>

<histogram name="ChromeOS.DiagnosticsUi.MemoryRoutineDuration" units="s"
    expires_after="2022-06-15">
  <owner>gavindodd@chromium.org</owner>
  <owner>zentaro@chromium.org</owner>
  <owner>cros-peripherals@google.com</owner>
  <summary>
    Records the duration that the Memory Routine took to complete. Emitted when
    the routine completes successfully.
  </summary>
</histogram>

<histogram name="ChromeOS.DiagnosticsUi.OpenDuration" units="ms"
    expires_after="2022-06-15">
  <owner>gavindodd@chromium.org</owner>
  <owner>zentaro@chromium.org</owner>
  <owner>cros-peripherals@google.com</owner>
  <summary>
    Records the duration that the Diagnostics App is open. emitted when the app
    is closed.
  </summary>
</histogram>

<histogram name="ChromeOS.DiagnosticsUi.RoutineCount" units="routines"
    expires_after="2022-06-15">
  <owner>gavindodd@chromium.org</owner>
  <owner>zentaro@chromium.org</owner>
  <owner>cros-peripherals@google.com</owner>
  <summary>
    Records the number of routines run while the Chrome OS Diagnostics App was
    open. Begins at zero each time the app is open and recorded each time the
    app is closed.
  </summary>
</histogram>

<histogram name="ChromeOS.DiagnosticsUi.{RoutineType}Result"
    enum="CrosDiagnosticsRoutineResult" expires_after="2022-06-15">
  <owner>gavindodd@chromium.org</owner>
  <owner>zentaro@chromium.org</owner>
  <owner>cros-peripherals@google.com</owner>
  <summary>Records the result of the {RoutineType} Routine.</summary>
  <token key="RoutineType">
    <variant name="BatteryCharge"/>
    <variant name="BatteryDischarge"/>
    <variant name="CaptivePortal"/>
    <variant name="CpuCache"/>
    <variant name="CpuFloatingPoint"/>
    <variant name="CpuPrime"/>
    <variant name="CpuStress"/>
    <variant name="DnsLatency"/>
    <variant name="DnsResolution"/>
    <variant name="DnsResolverPresent"/>
    <variant name="GatewayCanBePinged"/>
    <variant name="HasSecureWiFiConnection"/>
    <variant name="HttpFirewall"/>
    <variant name="HttpsFirewall"/>
    <variant name="HttpsLatency"/>
    <variant name="LanConnectivity"/>
    <variant name="Memory"/>
    <variant name="SignalStrength"/>
  </token>
</histogram>

<histogram name="ChromeOS.FamilyLink.ChildStatusReportRequest.Size" units="KB"
    expires_after="2022-08-23">
  <owner>tobyhuang@chromium.org</owner>
  <owner>cros-families-eng@google.com</owner>
  <summary>
    Reports the size of the uploaded ChildStatusReportRequest proto in
    kilobytes. This metric records right before the report uploads. The max
    bucket value is 500MB.
  </summary>
</histogram>

<histogram
    name="ChromeOS.FamilyLink.ChildStatusReportRequest.TimeSinceLastReport"
    units="minutes" expires_after="2022-08-23">
  <owner>tobyhuang@chromium.org</owner>
  <owner>cros-families-eng@google.com</owner>
  <summary>
    Reports the time in between ChildStatusReportRequest uploads in minutes. The
    default upload frequency is once every ten minutes. This metric records
    right before the report uploads. The max bucket value is 100,000 minutes
    (1667 hours).
  </summary>
</histogram>

<histogram name="ChromeOS.FamilyLinkUser.LogSegment"
    enum="FamilyLinkUserLogSegment" expires_after="never">
<!-- expires-never: used internally for filtering -->

  <owner>tobyhuang@chromium.org</owner>
  <owner>cros-families-eng@google.com</owner>
  <owner>chrome-metrics-team@google.com</owner>
  <summary>
    Categorizes the current user for the Family Experiences team's metrics.
    Other is for all other users that do not fall into any of the below
    categories. Users under the age of consent automatically have supervision
    applied to their accounts. Users over the age of consent can opt into
    supervision.
  </summary>
</histogram>

<histogram name="ChromeOS.FamilyUser.LogSegment" enum="FamilyUserLogSegment"
    expires_after="2021-07-23">
  <obsolete>
    Replaced with ChromeOS.FamilyUser.LogSegment2 in M90
  </obsolete>
  <owner>tobyhuang@chromium.org</owner>
  <owner>cros-families-eng@google.com</owner>
  <owner>chrome-metrics-team@google.com</owner>
  <summary>
    Categorizes the current user for the Family Experiences team's metrics.
    Other is for all other users that do not fall into any of the below
    categories. A Supervised User has a supervised primary account and no
    secondary accounts. A Supervised Student has a supervised primary account
    and one or more EDU secondary accounts, which is the only available option
    for a secondary account in that scenario. A Student at Home has a K-12 EDU
    primary account on an unmanaged ChromeOS device, regardless of the secondary
    account.
  </summary>
</histogram>

<histogram name="ChromeOS.FamilyUser.LogSegment2" enum="FamilyUserLogSegment"
    expires_after="never">
<!-- expires-never: used internally for filtering -->

  <owner>tobyhuang@chromium.org</owner>
  <owner>cros-families-eng@google.com</owner>
  <owner>chrome-metrics-team@google.com</owner>
  <summary>
    Categorizes the current user for the Family Experiences team's metrics.
    Other is for all other users that do not fall into any of the below
    categories. A Supervised User has a supervised primary account and no
    secondary accounts. A Supervised Student has a supervised primary account
    and one or more EDU secondary accounts, which is the only available option
    for a secondary account in that scenario. A Student at Home has a K-12 EDU
    primary account on an unmanaged ChromeOS device, regardless of the secondary
    account. A Regular User is an unmanaged consumer user on any device. This
    metric is logged with every UMA upload in ProvideCurrentSessionData().
  </summary>
</histogram>

<histogram name="ChromeOS.FamilyUser.NumSecondaryAccounts" units="accounts"
    expires_after="2022-03-10">
  <owner>tobyhuang@chromium.org</owner>
  <owner>cros-families-eng@google.com</owner>
  <owner>chrome-metrics-team@google.com</owner>
  <summary>
    Reports the number of secondary accounts besides the primary user. This
    metric is logged with every UMA upload in ProvideCurrentSessionData(). This
    metric is not reported for guest users.
  </summary>
</histogram>

<histogram name="ChromeOS.FeatureUsage.{FeatureName}" enum="FeatureUsageEvent"
    expires_after="2022-11-11">
  <owner>rsorokin@chromium.org</owner>
  <owner>cros-oac@google.com</owner>
  <summary>
    Records device eligibility, enabled status, and success rate for the
    {FeatureName} feature. Different events are recorded at different times, as
    described in the enum labels.
  </summary>
  <token key="FeatureName" variants="FeaturesLoggingUsageEvents"/>
</histogram>

<histogram name="ChromeOS.FeatureUsage.{FeatureName}.Usetime" units="ms"
    expires_after="2022-11-11">
  <owner>rsorokin@chromium.org</owner>
  <owner>cros-oac@google.com</owner>
  <summary>
    Records the duration of time (ms) a given {FeatureName} feature was used.
  </summary>
  <token key="FeatureName" variants="FeaturesLoggingUsageEvents"/>
</histogram>

<histogram name="ChromeOS.GAIA.AuthenticatorContentWindowNull" enum="Boolean"
    expires_after="M85">
  <obsolete>
    Removed 2020-10.
  </obsolete>
  <owner>wjmaclean@chromium.org</owner>
  <summary>
    Whether the GAIA Authenticator unexpectedly encountered a null contentWindow
    value while handling WebView's onContentLoad event. This metric is only
    enabled for AuthMode = DEFAULT, which indicates ChromeOS online login. This
    is the only mode where the issue has been observed. Other modes not captured
    here are OFFLINE (offline ChromeOS login) and DESKTOP (for online GAIA login
    on desktop Chrome).
  </summary>
</histogram>

<histogram name="ChromeOS.Gaia.Message.{GaiaAuthFlow}.{MessageName}"
    enum="BooleanReceived" expires_after="2022-06-01">
  <owner>rsorokin@chromium.org</owner>
  <owner>cros-oac@google.com</owner>
  <summary>
    Records whether or not {MessageName} was received during the {GaiaAuthFlow}
    authentication on the login screen. Recorded on the successful online
    authentication only.
  </summary>
  <token key="GaiaAuthFlow">
    <variant name="Gaia"/>
    <variant name="Saml"/>
  </token>
  <token key="MessageName">
    <variant name="CloseView"/>
    <variant name="UserInfo"/>
  </token>
</histogram>

<histogram name="ChromeOS.Gaia.PasswordFlow" enum="BooleanStartedCompleted"
    expires_after="2022-06-01">
  <owner>rsorokin@chromium.org</owner>
  <owner>cros-oac@google.com</owner>
  <summary>
    Records events for the Gaia password flow. &quot;Started&quot; is recorded
    on each password entry on the Gaia page. &quot;Completed&quot; is recorded
    when Gaia authentication succeeds. Note: this is not recorded for SAML
    flows.
  </summary>
</histogram>

<histogram base="true" name="ChromeOS.HardwareVerifier.Report"
    enum="HardwareVerifierQualificationStatus" expires_after="2022-04-10">
<!-- Name completed by histogram_suffixes name="HardwareVerifierSupportCategory" -->

  <owner>itspeter@chromium.org</owner>
  <owner>stimim@chromium.org</owner>
  <owner>chromeos-hw-checker@google.com</owner>
  <summary>
    Qualification status of each component types. This entry is generated by
    hardware_verifier.conf at boot time.
  </summary>
</histogram>

<histogram name="ChromeOS.HardwareVerifier.Report.IsCompliant" enum="Boolean"
    expires_after="2022-07-03">
  <owner>itspeter@chromium.org</owner>
  <owner>stimim@chromium.org</owner>
  <owner>chromeos-hw-checker@google.com</owner>
  <summary>Aggregated result of hardware verifier check.</summary>
</histogram>

<histogram name="ChromeOS.HardwareVerifier.TimeToFinish" units="ms"
    expires_after="2022-04-17">
  <owner>itspeter@chromium.org</owner>
  <owner>stimim@chromium.org</owner>
  <owner>chromeos-hw-checker@google.com</owner>
  <summary>
    The amount of time it takes to finish one hardware verification run.
  </summary>
</histogram>

<histogram name="ChromeOS.HardwareVerifier.TimeToProbe" units="ms"
    expires_after="2022-04-10">
  <owner>itspeter@chromium.org</owner>
  <owner>stimim@chromium.org</owner>
  <owner>chromeos-hw-checker@google.com</owner>
  <summary>The amount of time it takes to probe hardware components.</summary>
</histogram>

<histogram name="ChromeOS.IioService.SensorClientConcurrent" units="clients"
    expires_after="2022-05-01">
  <owner>chenghaoyang@chromium.org</owner>
  <owner>chromeos-sensors-eng@google.com</owner>
  <summary>
    Records the maximum number of concurrent sensor clients within an hour,
    which indicates how many apps are using sensors. Recorded once every hour.
    Might not be recorded for tail-end usage during a session.
  </summary>
</histogram>

<histogram name="ChromeOS.IioService.SensorObserver" units="observers"
    expires_after="2022-05-01">
  <owner>chenghaoyang@chromium.org</owner>
  <owner>chromeos-sensors-eng@google.com</owner>
  <summary>
    Records the maximum number of running observers within an hour to any
    sensor. It indicates how widely used the sensor samples are. Recorded once
    every hour. Might not be recorded for tail-end usage during a session.
  </summary>
</histogram>

<histogram name="ChromeOS.IioService.SensorObserverOpen" units="observers"
    expires_after="2022-05-01">
  <owner>chenghaoyang@chromium.org</owner>
  <owner>chromeos-sensors-eng@google.com</owner>
  <summary>
    Records the number of opened observer within an hour, which indicates how
    often sensors are enabled and disabled. Recorded once every hour. Might not
    be recorded for tail-end usage during a session.
  </summary>
</histogram>

<histogram name="ChromeOS.IioService.SensorUsage.{Frequency}Hz"
    enum="ChromeOSIioServiceSensorUsage" expires_after="2022-05-01">
  <owner>chenghaoyang@chromium.org</owner>
  <owner>chromeos-sensors-eng@google.com</owner>
  <summary>
    Records the usage of the sensor within an hour with at least {Frequency} Hz.
    Recorded once every hour. Might not be recorded for tail-end usage during a
    session.
  </summary>
  <token key="Frequency">
    <variant name="0"/>
    <variant name="10"/>
    <variant name="50"/>
    <variant name="100"/>
  </token>
</histogram>

<histogram name="ChromeOS.Intents.IntentPickerAction"
    enum="IntentPickerDialogAction" expires_after="2022-06-01">
  <owner>tsergeant@chromium.org</owner>
  <owner>chromeos-apps-foundation-team@google.com</owner>
  <summary>
    The intent picker dialog is shown (either automatically, or though a page
    action button) when the user navigates to a page whose URL can be handled by
    an installed app. This metric is recorded when the dialog is closed and
    records the user action which caused it to close.
  </summary>
</histogram>

<histogram name="ChromeOS.Intents.IntentPickerAction.From{LaunchSource}"
    enum="IntentPickerDialogAction" expires_after="2022-06-01">
  <owner>tsergeant@chromium.org</owner>
  <owner>chromeos-apps-foundation-team@google.com</owner>
  <summary>
    The intent picker dialog is shown when the user navigates to a page whose
    URL can be handled by an installed app. This metric is recorded when the
    dialog is closed and records the user action which caused it to close. Only
    recorded when the Intent Picker dialog is shown from {LaunchSource}.
  </summary>
  <token key="LaunchSource">
    <variant name="AutoPopOut"/>
    <variant name="OmniboxIcon"/>
  </token>
</histogram>

<histogram name="ChromeOS.Intents.IntentPickerIconEvent"
    enum="IntentPickerIconEvent" expires_after="2022-06-01">
  <owner>tsergeant@chromium.org</owner>
  <owner>chromeos-apps-foundation-team@google.com</owner>
  <summary>
    Records events associated with the intent picker icon in the omnibox.
    Recorded when the icon is shown or interacted with.
  </summary>
</histogram>

<histogram name="ChromeOS.IsLacrosBrowser" enum="Boolean" expires_after="never">
<!-- expires-never: Used to identify lacros binary in metrics backend. -->

  <owner>jamescook@chromium.org</owner>
  <owner>lacros-team@google.com</owner>
  <summary>
    Recorded as part of the metrics session data to identify the lacros-chrome
    browser binary.
  </summary>
</histogram>

<histogram name="ChromeOS.KeyPermissionsManager.ArcUsageUpdate"
    enum="KeyPermissionsManagerArcUsageUpdateStatus" expires_after="2022-02-06">
  <owner>omorsi@google.com</owner>
  <owner>pmarko@google.com</owner>
  <summary>
    Counts the number of times the arc usage flags update started as well as the
    number of times it succeeded and failed.
  </summary>
</histogram>

<histogram name="ChromeOS.KeyPermissionsManager.ArcUsageUpdateTime" units="ms"
    expires_after="2022-02-06">
  <owner>omorsi@google.com</owner>
  <owner>pmarko@chromium.org</owner>
  <summary>
    Records the time taken to successfully update chaps with the new ARC usage
    flags.
  </summary>
</histogram>

<histogram name="ChromeOS.KeyPermissionsManager.Migration"
    enum="KeyPermissionsManagerMigrationStatus" expires_after="2022-05-01">
  <owner>omorsi@google.com</owner>
  <owner>pmarko@google.com</owner>
  <summary>
    Counts the number of times the migration started as well as the number of
    times it succeeded and failed.
  </summary>
</histogram>

<histogram name="ChromeOS.KeyPermissionsManager.MigrationTime" units="ms"
    expires_after="2022-02-06">
  <owner>omorsi@google.com</owner>
  <owner>pmarko@chromium.org</owner>
  <summary>
    Records the time taken to successfully migrate key permissions to chaps.
  </summary>
</histogram>

<histogram name="ChromeOS.Lacros.OSChannel" enum="ChromeOSChannel"
    expires_after="2022-10-01">
  <owner>erikchen@chromium.org</owner>
  <owner>lacros-team@google.com</owner>
  <summary>
    The release channel of the Chrome OS system on which Lacros is running. May
    be different than the Lacros browser release channel. Recorded by the lacros
    binary shortly after startup.
  </summary>
</histogram>

<histogram name="ChromeOS.Lacros.StartTime" units="ms"
    expires_after="2022-10-01">
  <owner>erikchen@chromium.org</owner>
  <owner>lacros-team@google.com</owner>
  <summary>
    Time to start the lacros binary, specifically the time between when the
    process is launched and the mojo connection is established between ash and
    lacros. Recorded by ash each time the lacros binary is started.
  </summary>
</histogram>

<histogram name="ChromeOS.LanguagePacks.InstallComplete.Success"
    enum="BooleanSuccess" expires_after="2022-10-01">
  <owner>claudiomagni@chromium.org</owner>
  <owner>mlcui@google.com</owner>
  <owner>dvallet@chromium.org</owner>
  <summary>
    Records whether a language pack installation was successful after a language
    pack installation attempt.
  </summary>
</histogram>

<histogram name="ChromeOS.LanguagePacks.UninstallComplete.Success"
    enum="BooleanSuccess" expires_after="2022-10-01">
  <owner>claudiomagni@chromium.org</owner>
  <owner>mlcui@google.com</owner>
  <owner>dvallet@chromium.org</owner>
  <summary>
    Records whether a language pack uninstallation was successful after a
    language pack uninstallation attempt.
  </summary>
</histogram>

<histogram name="ChromeOS.LegacySupervisedUsers.HiddenFromLoginScreen"
    enum="LegacySupervisedUserStatus" expires_after="2022-04-09">
  <owner>tobyhuang@chromium.org</owner>
  <owner>cros-families-eng@google.com</owner>
  <summary>
    Reports &quot;hidden&quot; when the login screen hides a legacy supervised
    user (LSU). Reports &quot;displayed&quot; when the login screen displays a
    non-LSU Gaia user. Reports &quot;deleted&quot; when the login screen
    attempts to delete a LSU. Recorded whenever the user sees the login screen.
  </summary>
</histogram>

<histogram name="ChromeOS.Liveness.PingResponseTime" units="ms"
    expires_after="2022-08-05">
  <owner>rtinkoff@google.com</owner>
  <owner>xiyuan@google.com</owner>
  <summary>
    Reports the time (ms) elapsed between sending of a LivenessChecker ping and
    receipt of the response. Recorded when LivenessChecker receives a ping
    response.
  </summary>
</histogram>

<histogram name="ChromeOS.Logging.{LogType}EntryCountPerDay"
    units="log entries per day" expires_after="2021-07-31">
  <owner>yoshiki@chromium.org</owner>
  <owner>chromeos-velocity@chromium.org</owner>
  <summary>
    Metrics of the numbers of log entries recorded in {LogType}s. Recorded when
    the daily job &quot;chromeos-cleanup-logs&quot; is executed.
  </summary>
  <token key="LogType">
    <variant name="SystemLog"/>
    <variant name="UserLog"/>
  </token>
</histogram>

<histogram name="ChromeOS.Logging.{LogType}LogFileSizePerDay" units="MB"
    expires_after="2021-07-31">
  <owner>yoshiki@chromium.org</owner>
  <owner>chromeos-velocity@chromium.org</owner>
  <summary>
    File sizes of {LogType} files in megabytes. Recorded when the daily job
    &quot;chromeos-cleanup-logs&quot; is executed.
  </summary>
  <token key="LogType">
    <variant name="SystemArc"/>
    <variant name="SystemAudit"/>
    <variant name="SystemChrome"/>
    <variant name="SystemMessage"/>
    <variant name="SystemNet"/>
    <variant name="UserChrome"/>
  </token>
</histogram>

<histogram name="ChromeOS.Logging.{LogType}MaxThroughputPerMin"
    units="log entries per min" expires_after="2021-07-31">
  <owner>yoshiki@chromium.org</owner>
  <owner>chromeos-velocity@chromium.org</owner>
  <summary>
    Metrics of the number of maximum throughput (entries per minute) recorded in
    {LogType}s within a day. Recorded when the daily job
    &quot;chromeos-cleanup-logs&quot; is executed.
  </summary>
  <token key="LogType">
    <variant name="SystemLog"/>
    <variant name="UserLog"/>
  </token>
</histogram>

<histogram name="ChromeOS.Logging.{LogType}TotalFileSize" units="MB"
    expires_after="2021-07-31">
  <owner>yoshiki@chromium.org</owner>
  <owner>chromeos-velocity@chromium.org</owner>
  <summary>
    Total file sizes of {LogType} files in megabytes. Recorded when the daily
    job &quot;chromeos-cleanup-logs&quot; is executed.
  </summary>
  <token key="LogType">
    <variant name="SystemLog"/>
    <variant name="UserLog"/>
  </token>
</histogram>

<histogram name="ChromeOS.MachineIdRegen.AgeSeconds" units="seconds"
    expires_after="2022-02-02">
  <owner>ahassani@chromium.org</owner>
  <owner>chromeos-core-services@google.com</owner>
  <summary>
    The number of seconds of uptime since the last time the Chrome OS machine-id
    was regenerated. This is reported every time the machine-id is regenerated
    except for the first time since reboot.

    NB: Data before M90 is incomplete.
  </summary>
</histogram>

<histogram name="ChromeOS.MachineIdRegen.Lock" enum="BooleanLockingSuccess"
    expires_after="2022-02-02">
  <owner>ahassani@chromium.org</owner>
  <owner>chromeos-core-services@google.com</owner>
  <summary>
    Measures whether the MachineIdRegen script acquires the lock. Success / Fail
    is recorded every time the script is invoked. This is to test if the locking
    is working as expected.
  </summary>
</histogram>

<histogram name="ChromeOS.MachineIdRegen.Reason" enum="ChromeOSMachineIdReason"
    expires_after="2022-05-01">
  <owner>ahassani@chromium.org</owner>
  <owner>chromeos-core-services@google.com</owner>
  <summary>
    The reason why the Chrome OS machine-id was regenerated. This is reported
    when the machine-id is re-generated.

    NB: Data before M90 is incomplete.
  </summary>
</histogram>

<histogram name="ChromeOS.MemoryPressureLevel" enum="MemoryPressureLevel"
    expires_after="2022-04-24">
  <owner>xdai@chromium.org</owner>
  <summary>
    The memory pressure level in Chrome OS, which is recorded periodically (once
    per second). This is used to show the relative frequency of the system being
    in a critical vs relaxed memory pressure state.
  </summary>
</histogram>

<histogram name="ChromeOS.MessageCenter.ScrollActionReason"
    enum="ChromeOSMessageCenterScrollActionReason" expires_after="2022-11-22">
  <owner>yoshiki@chromium.org</owner>
  <owner>omrilio@chromium.org</owner>
  <owner>leandre@chromium.org</owner>
  <owner>cros-status-area-eng@google.com</owner>
  <summary>
    The cause of the scroll event by the user on the message center. Only the
    first event after the message center opens is recorded. For example, the
    user opens the message center and scrolls by mouse then by key, only the
    mouse event is recorded. If the user closes and reopens the message center
    before the second event, both events are recorded.
  </summary>
</histogram>

<histogram name="ChromeOS.PlatformKeysService.{Operation}.{KeyType}"
    enum="BooleanSuccess" expires_after="2022-03-19">
  <owner>omorsi@google.com</owner>
  <owner>mgawad@google.com</owner>
  <summary>
    Tracks the final result of performing {Operation} operation on an {KeyType}
    key in PlatformKeysService.
  </summary>
  <token key="Operation">
    <variant name="GenerateKey"/>
    <variant name="SignKey"/>
  </token>
  <token key="KeyType">
    <variant name="EC"/>
    <variant name="RSA"/>
  </token>
</histogram>

<histogram name="ChromeOS.PlatformVerification.Available"
    enum="BooleanAvailable" expires_after="2021-12-21">
  <owner>apronin@chromium.org</owner>
  <owner>cros-hwsec+uma@chromium.org</owner>
  <summary>
    Whether platform verification subsystem features are available at the time a
    platform verification request is made for content protection on Chrome OS.
  </summary>
</histogram>

<histogram name="ChromeOS.PlatformVerification.BrowserResult"
    enum="ChromeOSPlatformVerificationBrowserResult" expires_after="2022-05-21">
  <owner>erikchen@chromium.org</owner>
  <owner>cros-hwsec+uma@chromium.org</owner>
  <summary>
    The result of a platform verification attempt for content protection on
    Chrome OS, limited to the browser-specific checks. It's still possible for
    platform verification to fail at later layers.
  </summary>
</histogram>

<histogram name="ChromeOS.PlatformVerification.Result"
    enum="ChromeOSPlatformVerificationResult" expires_after="2021-12-21">
  <obsolete>
    Replaced with pattern histogram ChromeOS.PlatformVerification.Result2.
    (2021-06 // M93).
  </obsolete>
  <owner>apronin@chromium.org</owner>
  <owner>cros-hwsec+uma@chromium.org</owner>
  <summary>
    The result of a platform verification attempt for content protection on
    Chrome OS.
  </summary>
</histogram>

<histogram name="ChromeOS.PlatformVerification.Result2"
    enum="ChromeOSPlatformVerificationResult2" expires_after="2022-07-03">
  <owner>erikchen@chromium.org</owner>
  <owner>cros-hwsec+uma@chromium.org</owner>
  <summary>
    The result of a platform verification attempt for content protection on
    Chrome OS. Does not include browser-related failures. Those are tracked in
    ChromeOS.PlatformVerification.BrowserResult.
  </summary>
</histogram>

<histogram name="ChromeOS.PrivacyScreen.Toggled"
    enum="PrivacyScreenToggleUISurface" expires_after="2022-04-01">
  <owner>tengs@chromium.org</owner>
  <owner>gzadina@google.com</owner>
  <summary>
    Record when the user toggles the integrated privacy screen on/off. See the
    PrivacyScreenToggleUISurface enum for all UI surfaces for toggling the
    feature.
  </summary>
</histogram>

<histogram name="ChromeOS.SAML.APILogin" enum="ChromeOSSamlApiUsed"
    expires_after="2022-04-02">
  <owner>mslus@chromium.org</owner>
  <owner>emaxx@chromium.org</owner>
  <summary>
    Records every online login authenticated purely with GAIA or with SAML.
  </summary>
</histogram>

<histogram name="ChromeOS.SAML.InSessionPasswordChangeEvent"
    enum="SamlInSessionPasswordChangeEvent" expires_after="2022-03-12">
  <owner>mslus@chromium.org</owner>
  <owner>rsorokin@chromium.org</owner>
  <summary>
    Records how often users are guided through the SAML in-session password
    change flow, and how often it is completed succesfully.
  </summary>
</histogram>

<histogram name="ChromeOS.SAML.InSessionPasswordSyncEvent"
    enum="SamlInSessionPasswordSyncEvent" expires_after="2022-04-30">
  <owner>mslus@chromium.org</owner>
  <owner>mohammedabdon@chromium.org</owner>
  <summary>
    Records how often password sync token API is called. Tracks results of token
    verify operation and API errors.
  </summary>
</histogram>

<histogram name="ChromeOS.SAML.Provider" enum="ChromeOSSamlProvider"
    expires_after="2022-04-17">
  <owner>mslus@chromium.org</owner>
  <owner>mohammedabdon@chromium.org</owner>
  <summary>Records SAML provider when SAML login flow is used.</summary>
</histogram>

<histogram name="ChromeOS.SAML.SamlChallengeKeyHandlerResult"
    enum="SamlChallengeKeyHandlerResult" expires_after="2022-02-01">
  <owner>miersh@google.com</owner>
  <owner>pmarko@chromium.org</owner>
  <summary>
    Tracks results of calculating response for a challenge from Verified Access
    server for remove attestation during SAML authentication.
  </summary>
</histogram>

<histogram name="ChromeOS.SAML.Scraping.PasswordCountAll" units="passwords"
    expires_after="2022-03-21">
  <owner>mslus@chromium.org</owner>
  <owner>emaxx@chromium.org</owner>
  <summary>
    The number of passwords that were scraped during a Chrome OS login via SAML.
    This is set only when the Chrome Credentials Passing API is not used.
  </summary>
</histogram>

<histogram name="ChromeOS.SAML.Scraping.VerificationResult"
    enum="BooleanSuccess" expires_after="M78">
  <owner>bartfab@chromium.org</owner>
  <summary>
    Whether one of the scraped passwords was successfully verified as the user's
    password. This is set only when the Chrome Credentials Passing API is not
    used.
  </summary>
</histogram>

<histogram name="ChromeOS.SecurityAnomaly" enum="SecurityAnomaly"
    expires_after="2022-04-03">
  <owner>jorgelo@chromium.org</owner>
  <owner>chromeos-security-core@google.com</owner>
  <summary>
    Records when an event representing a deviation from the Chrome OS security
    posture happens.

    Writable+executable mount events are checked every thirty seconds, but each
    anomalous event is reported only once per boot.
  </summary>
</histogram>

<histogram name="ChromeOS.SecurityAnomalyUploadSuccess" enum="Boolean"
    expires_after="2022-04-03">
  <owner>jorgelo@chromium.org</owner>
  <owner>chromeos-security-core@google.com</owner>
  <summary>
    Records the result (boolean success or failure) of attempting to report a
    Chrome OS system as anomalous via the crash reporting service.

    Reporting is only attempted if one or more anomalies are detected (see the
    previous histogram's description for the types of anomalies considered),
    *and* once per boot, even if reporting fails.

    So this histogram will be recorded at most once per boot, and only if a
    system is detected as anomalous (i.e. presents any of the tracked
    anomalies.)
  </summary>
</histogram>

<histogram name="ChromeOS.Sharesheet.AppCount" units="apps" expires_after="M95">
  <obsolete>
    Replaced with pattern histogram ChromeOS.Sharesheet.AppCount.{AppType}.
    (2021-03)
  </obsolete>
  <owner>dominickn@chromium.org</owner>
  <owner>melzhang@chromium.org</owner>
  <summary>
    Records number of apps found for a given intent in the Sharesheet.
  </summary>
</histogram>

<histogram name="ChromeOS.Sharesheet.AppCount.{AppType}" units="apps"
    expires_after="M95">
  <obsolete>
    Replaced with pattern histogram ChromeOS.Sharesheet.AppCount2.{AppType}.
    (2021-06)
  </obsolete>
  <owner>dominickn@chromium.org</owner>
  <owner>melzhang@chromium.org</owner>
  <summary>
    Records number of {AppType} apps found for a given intent in the Sharesheet
    when the sharesheet is invoked.
  </summary>
  <token key="AppType">
    <variant name="All" summary="all apps"/>
    <variant name="Arc" summary="arc app"/>
    <variant name="Web" summary="web app"/>
  </token>
</histogram>

<histogram name="ChromeOS.Sharesheet.AppCount2.{AppType}" units="apps"
    expires_after="2022-10-08">
  <owner>dominickn@chromium.org</owner>
  <owner>melzhang@chromium.org</owner>
  <summary>
    Records number of {AppType} apps found for a given intent in the Sharesheet
    when the sharesheet is invoked. Has 100 exponential buckets. (The original
    histogram had 1000 linear buckets).

    Warning: this histogram was expired from M95 to M96; data may be missing.
  </summary>
  <token key="AppType">
    <variant name="All" summary="all apps"/>
    <variant name="Arc" summary="arc app"/>
    <variant name="Web" summary="web app"/>
  </token>
</histogram>

<histogram name="ChromeOS.Sharesheet.FileCount" units="files"
    expires_after="2022-10-08">
  <owner>dominickn@chromium.org</owner>
  <owner>melzhang@chromium.org</owner>
  <summary>
    Records the number of files a user is trying to share from the Sharesheet
    when the sharesheet is invoked.
  </summary>
</histogram>

<histogram name="ChromeOS.Sharesheet.FormFactor"
    enum="ChromeOSSharesheetFormFactor" expires_after="2022-10-08">
  <owner>dominickn@chromium.org</owner>
  <owner>melzhang@chromium.org</owner>
  <summary>Records the form factor when the Sharesheet is invoked.</summary>
</histogram>

<histogram name="ChromeOS.Sharesheet.IsDriveFolder" enum="Boolean"
    expires_after="2022-10-08">
  <owner>dominickn@chromium.org</owner>
  <owner>melzhang@chromium.org</owner>
  <summary>
    If the value is true, the data being shared from the Sharesheet is a folder
    from Drive. Recorded when the sharesheet is invoked.
  </summary>
</histogram>

<histogram name="ChromeOS.Sharesheet.IsImagePreviewPressed"
    enum="BooleanSelected" expires_after="2022-10-08">
  <owner>dominickn@chromium.org</owner>
  <owner>melzhang@chromium.org</owner>
  <summary>
    If the value is true, the image preview was pressed during the current
    invocation. Recorded when the sharesheet closes.
  </summary>
</histogram>

<histogram name="ChromeOS.Sharesheet.LaunchSource"
    enum="ChromeOSSharesheetLaunchSource" expires_after="2022-10-08">
  <owner>dominickn@chromium.org</owner>
  <owner>melzhang@chromium.org</owner>
  <summary>
    Records the source from which the Sharesheet is invoked.

    Warning: this histogram was expired from M95 to M96; data may be missing.
  </summary>
</histogram>

<histogram name="ChromeOS.Sharesheet.ShareActionCount"
    enum="ChromeOSSharesheetAction" expires_after="2022-10-08">
  <owner>dominickn@chromium.org</owner>
  <owner>melzhang@chromium.org</owner>
  <summary>
    Records each action found for a given intent when the Sharesheet is invoked.

    Warning: this histogram was expired from M95 to M96; data may be missing.
  </summary>
</histogram>

<histogram name="ChromeOS.Sharesheet.UserAction"
    enum="ChromeOSSharesheetAction" expires_after="2022-10-08">
  <owner>dominickn@chromium.org</owner>
  <owner>melzhang@chromium.org</owner>
  <summary>Records user action on sharesheet invocations.</summary>
</histogram>

<histogram name="ChromeOS.Sharesheet.{Location}.MimeType"
    enum="ChromeOSSharesheetMimeType" expires_after="2022-10-08">
  <owner>melzhang@chromium.org</owner>
  <owner>chromeos-apps-foundation-team@google.com</owner>
  <summary>
    Records the mime type of the content being copied at the {Location} point in
    the Sharesheet flow.

    This histogram could record multiple times in a single share in the event
    that the user shares data of mime types at once. However, a single share
    will not record the same mime type twice. E.g. sharing 2 images in one share
    will record the image mimetype once.
  </summary>
  <token key="Location">
    <variant name="CopyToClipboard"
        summary="After copy to clipboard is selected"/>
    <variant name="Invocation" summary="When the sharesheet is first invoked"/>
  </token>
</histogram>

<histogram name="ChromeOS.Sync.PreferencesMigrated" enum="BooleanMigrated"
    expires_after="2022-06-01">
  <owner>rsorokin@chromium.org</owner>
  <owner>jamescook@chromium.org</owner>
  <owner>cros-oac@google.com</owner>
  <summary>
    Tracks whether browser sync preferences were migrated to the new OS sync
    feature (project SplitSettingsSync). Recorded once per session during login.
  </summary>
</histogram>

<histogram base="true" name="ChromeOS.SystemTray.AnimationSmoothness" units="%"
    expires_after="2022-04-13">
<!-- Name completed by histogram suffixes
     name="SystemTrayTransitionType" -->

  <owner>amehfooz@chromium.org</owner>
  <owner>tengs@chromium.org</owner>
  <summary>
    Tracks the animation smoothness for the collapse / expand animation of the
    system tray.
  </summary>
</histogram>

<histogram name="ChromeOS.SystemTray.BlockedNotifiersAfterUpdate"
    units="notifiers" expires_after="2022-05-10">
  <owner>amehfooz@chromium.org</owner>
  <owner>gzadina@google.com</owner>
  <summary>
    Tracks the number of blocked notifiers in the system tray after the user
    blocks one or multiple notifiers. Note that this metric records the number
    of blocked notifiers *after* the update.
  </summary>
</histogram>

<histogram name="ChromeOS.SystemTray.BlockedNotifiersOnOpen" units="notifiers"
    expires_after="2022-05-10">
  <owner>amehfooz@chromium.org</owner>
  <owner>gzadina@google.com</owner>
  <summary>
    Tracks the number of blocked notifiers in the system tray when it is opened.
  </summary>
</histogram>

<histogram name="ChromeOS.SystemTray.FeaturePodCountOnOpen" units="count"
    expires_after="2022-04-01">
  <owner>amehfooz@chromium.org</owner>
  <owner>gzadina@google.com</owner>
  <summary>
    The number of feature pods (e.g. WiFi, Bluetooth, IME, Accessibility, etc.)
    in the system tray quick settings when it is opened, including pods that
    overflow to other pages. See
    ChromeOS.SystemTray.Tablet.FeaturePodCountOnOpen for the corresponding
    histogram logged in tablet mode.
  </summary>
</histogram>

<histogram name="ChromeOS.SystemTray.FirstInteraction"
    enum="CrosSystemTrayFirstInteraction" expires_after="2022-04-01">
  <owner>amehfooz@chromium.org</owner>
  <owner>gzadina@google.com</owner>
  <summary>
    Records the first interaction the user has with the system tray, which can
    be a click/tap on the quick settings or message center bubble. Note that
    this interaction could be at any time after the user opens the tray (e.g. 30
    seconds later before the first click).
  </summary>
</histogram>

<histogram name="ChromeOS.SystemTray.Interaction"
    enum="CrosSystemTrayInteraction" expires_after="2022-04-01">
  <owner>amehfooz@chromium.org</owner>
  <owner>gzadina@google.com</owner>
  <summary>
    An enum value how system tray bubble is interacted e.g. by tap (touch
    screen), or click (mouse, trackpad, etc.) Reported every time the region
    inside system tray bubble is tapped or clicked.
  </summary>
</histogram>

<histogram name="ChromeOS.SystemTray.IsExpandedOnOpen" enum="Boolean"
    expires_after="2022-05-10">
  <owner>tengs@chromium.org</owner>
  <owner>gzadina@google.com</owner>
  <summary>
    If the value is true, SystemTray is expanded when it's opened. Otherwise,
    it's closed when it's opened.
  </summary>
</histogram>

<histogram name="ChromeOS.SystemTray.NotificationsRemovedByClearAll"
    units="notifications" expires_after="2022-04-01">
  <owner>amehfooz@chromium.org</owner>
  <owner>gzadina@google.com</owner>
  <summary>
    Records the number of notifications that are removed in a single clear all
    action by the user.
  </summary>
</histogram>

<histogram name="ChromeOS.SystemTray.OpenHelpPageForManaged"
    enum="CrosSystemTrayManagedType" expires_after="M83">
  <owner>yamaguchi@chromium.org</owner>
  <summary>
    Type of the support page which user opened by clicking the indicator of
    managed device type in the unified system tray bubble.
  </summary>
</histogram>

<histogram name="ChromeOS.SystemTray.ShelfPodCount" units="count"
    expires_after="2022-04-01">
  <owner>tengs@chromium.org</owner>
  <owner>gzadina@google.com</owner>
  <summary>
    The number of status area item pods (e.g. IME, Palette, Dictation, etc.) in
    the shelf status area whenever a pod appears/disappears. This histogram is
    only logged when the device is not in tablet mode, otherwise
    ChromeOS.SystemTray.Tablet.ShelfPodCount is logged.
  </summary>
</histogram>

<histogram name="ChromeOS.SystemTray.Tablet.FeaturePodCountOnOpen"
    units="count" expires_after="2022-05-10">
  <owner>amehfooz@chromium.org</owner>
  <owner>gzadina@google.com</owner>
  <summary>
    The number of feature pods (e.g. WiFi, Bluetooth, IME, Accessibility, etc.)
    in the system tray quick settings when it is opened, including pods that
    overflow to other pages. This histogram is only logged when the device is in
    tablet mode, otherwise ChromeOS.SystemTray.FeaturePodCountOnOpen is logged.
  </summary>
</histogram>

<histogram name="ChromeOS.SystemTray.Tablet.ShelfPodCount" units="count"
    expires_after="2022-04-01">
  <owner>tengs@chromium.org</owner>
  <owner>gzadina@google.com</owner>
  <summary>
    The number of status area item pods (e.g. IME, Palette, Dictation, etc.) in
    the shelf status area whenever a pod appears/disappears. This histogram is
    only logged when the device is in tablet mode, otherwise
    ChromeOS.SystemTray.ShelfPodCount is logged.
  </summary>
</histogram>

<histogram name="ChromeOS.SystemTray.TimeToClick" units="ms"
    expires_after="2021-08-22">
  <owner>tengs@chromium.org</owner>
  <owner>gzadina@google.com</owner>
  <summary>
    The amount of time a user took from clicking on the button in status area,
    to clicking on an item in the system tray bubble. (Obsolete M90 onwards).
  </summary>
</histogram>

<histogram name="ChromeOS.SystemTray.TimeToClick2" units="ms"
    expires_after="2022-04-01">
  <owner>tengs@chromium.org</owner>
  <owner>gzadina@google.com</owner>
  <summary>
    The amount of time a user took after opening the system tray bubble, to
    clicking on an item in the system tray bubble.
  </summary>
</histogram>

<histogram name="ChromeOS.SystemTray.ToggleExpanded"
    enum="CrosSystemTrayToggleExpanded" expires_after="2022-05-10">
  <owner>amehfooz@chromium.org</owner>
  <owner>gzadina@google.com</owner>
  <summary>
    An enum value how system tray bubble is expanded or collapsed. It can be
    toggled by the button and touch gesture.
  </summary>
</histogram>

<histogram name="ChromeOS.TypeC.CableSpeed" enum="CableSpeedMetric"
    expires_after="2022-04-30">
  <owner>pmalani@chromium.org</owner>
  <owner>chromeos-power@google.com</owner>
  <summary>
    This value represents the speed of the USB Type-C cable which is connected
    to a device. It is recorded every time a new peripheral is connected.
  </summary>
</histogram>

<histogram name="ChromeOS.TypeC.PartnerType" enum="PartnerTypeMetric"
    expires_after="2022-04-30">
  <owner>pmalani@chromium.org</owner>
  <owner>chromeos-power@google.com</owner>
  <summary>
    This value represents the type of a USB Type-C peripheral (the Partner)
    which is connected to a device. It is recorded every time a new peripheral
    is connected.
  </summary>
</histogram>

<histogram name="ChromeOS.TypeC.WrongConfiguration"
    enum="WrongConfigurationMetric" expires_after="2022-04-30">
  <owner>pmalani@chromium.org</owner>
  <owner>chromeos-power@google.com</owner>
  <summary>
    This value represents events where a USB Type-C peripheral couldn't be
    configured correctly, or experienced some other unexpected behaviour. It is
    recorded every time a new peripheral is connected.
  </summary>
</histogram>

<histogram name="ChromeOS.UrlXattrsCount" units="units"
    expires_after="2022-04-10">
  <owner>jorgelo@chromium.org</owner>
  <owner>tnagel@chromium.org</owner>
  <summary>
    The number of files with URL extended attributes found in the users' home
    directories. This is emitted once per boot. See crbug.com/919486 and
    crbug.com/939386 for more details.
  </summary>
</histogram>

<histogram base="true" name="ChromeOS.USB.DeviceAttached"
    enum="ChromeOSUsbEventTiming" expires_after="2022-09-08">
  <owner>allenwebb@chromium.org</owner>
  <owner>jorgelo@chromium.org</owner>
  <owner>mnissler@chromium.org</owner>
  <summary>Timing and number of USB devices attached.</summary>
</histogram>

<histogram name="ChromeOS.UserAddingScreen.LoadTime" units="ms"
    expires_after="2021-05-16">
  <obsolete>
    Removed in M90, superseded by ChromeOS.UserAddingScreen.LoadTimeViewsBased.
  </obsolete>
  <owner>rsorokin@chromium.org</owner>
  <owner>tellier@google.com</owner>
  <owner>cros-oac@google.com</owner>
  <summary>
    The time spent before the web UI vesion of the multiprofile account picker
    is ready.
  </summary>
</histogram>

<histogram name="ChromeOS.UserAddingScreen.LoadTimeViewsBased" units="ms"
    expires_after="2021-09-19">
  <obsolete>
    Removed in M96.
  </obsolete>
  <owner>tellier@google.com</owner>
  <owner>rsorokin@chromium.org</owner>
  <owner>cros-oac@google.com</owner>
  <summary>
    The time spent before the views-based version of the multiprofile account
    picker is ready.
  </summary>
</histogram>

<histogram name="ChromeOS.UserTypeByDeviceType.LogSegment"
    enum="UserDeviceMatrix" expires_after="2022-04-24">
  <owner>bmalcolm@chromium.org</owner>
  <owner>cros-client-wa@google.com</owner>
  <summary>
    This value is reported at the start of a user session, and is a 32-bit value
    that reports the primary user account type and the device type (umanaged
    user on managed device, K12 user on an education device, etc.). The upper
    16-bits represent the device type (found at http://shortn/_3iFWcdjy0P), and
    the lower 16-bits represent the user type (found at
    http://shortn/_uK3ZM4pC0a). So a nonprofit user (0x03) on an enterprise
    device (0x02) would be 0x00020003 or 131075.
  </summary>
</histogram>

<histogram name="ChromeOS.WebAPK.MinterResponseOrErrorCode"
    enum="CombinedHttpResponseAndNetErrorCode" expires_after="2022-04-14">
  <owner>tsergeant@chromium.org</owner>
  <owner>chromeos-apps-foundation-team@google.com</owner>
  <summary>
    HTTP response code or net error code for requests made to the WebAPK minter
    service. Logged after a request to generate a WebAPK finishes, which happens
    when a PWA which supports Web Share Target is installed or updated.
  </summary>
</histogram>

<histogram name="ChromeOS.WebAPK.UninstallSource"
    enum="WebApkUninstallSourceChromeOS" expires_after="2022-04-01">
  <owner>tsergeant@chromium.org</owner>
  <owner>chromeos-apps-foundation-team@google.com</owner>
  <summary>
    Records the source of a WebAPK uninstall event. A WebAPK is installed when a
    PWA which supports Web Share Target is installed in the browser, and is
    uninstalled when the user uninstalls the PWA or uninstalls the WebAPK
    directly through ARC Android settings.
  </summary>
</histogram>

<histogram name="ChromeOS.WebAPK.UnlinkedWebAPKCount" units="count"
    expires_after="2022-03-14">
  <owner>tsergeant@chromium.org</owner>
  <owner>chromeos-apps-foundation-team@google.com</owner>
  <summary>
    Records the number of installed WebAPKs that were not linked to a Web App
    which were found and removed. The presence of these apps indicates that
    something went wrong in the WebAPK installation process. Unlinked apps are
    detected every startup, this histogram is only recorded when at least 1 app
    is found.
  </summary>
</histogram>

<histogram name="ChromeOS.WebAPK.{InstallType}.ArcInstallResult"
    enum="WebApkArcInstallResultChromeOS" expires_after="2022-04-14">
  <owner>tsergeant@chromium.org</owner>
  <owner>chromeos-apps-foundation-team@google.com</owner>
  <summary>
    Records the detailed result when WebAPK is installed through ARC. A WebAPK
    is generated and installed when a PWA which supports Web Share Target is
    installed in the browser, and updated when the PWA's manifest updates. This
    histogram records successes/errors in the last step of the WebAPK
    {InstallType} process, when the generated WebAPK is installed in ARC.
  </summary>
  <token key="InstallType">
    <variant name="Install"/>
    <variant name="Update"/>
  </token>
</histogram>

<histogram name="ChromeOS.WebAPK.{InstallType}.Result"
    enum="WebApkInstallResultChromeOS" expires_after="2022-04-14">
  <owner>tsergeant@chromium.org</owner>
  <owner>chromeos-apps-foundation-team@google.com</owner>
  <summary>
    Records the overall final state of a WebAPK {InstallType} operation on
    ChromeOS. A WebAPK is generated and installed when a PWA which supports Web
    Share Target is installed in the browser, and updated when the PWA's
    manifest updates.
  </summary>
  <token key="InstallType">
    <variant name="Install"/>
    <variant name="Update"/>
  </token>
</histogram>

<histogram name="ChromeOS.WXMountCount" units="count"
    expires_after="2022-06-30">
  <owner>jorgelo@chromium.org</owner>
  <owner>chromeos-security-core@google.com</owner>
  <summary>
    Records the number of writable+executable mounts on the system. The count
    itself is updated every 30 seconds, but this metric is reported every two
    hours of runtime. This metric is reported regardless of whether users are
    logged in or not. This metric is only reported on Chrome OS.
  </summary>
</histogram>

</histograms>

</histogram-configuration>