tools/metrics/histograms/metadata/browser/histograms.xml

<!--
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Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
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<!--
This file is used to generate a comprehensive list of Browser 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

Please follow the instructions in the OWNERS file in this directory to find a
reviewer. If no OWNERS file exists, please consider signing up at
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have an OWNERS file. As a last resort you can send the CL to
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-->

<histogram-configuration>

<histograms>

<variants name="ContinuousSearchExperiment">
  <variant name=".Discover">
    <obsolete>
      Deprecated as of 2021-06.
    </obsolete>
  </variant>
  <variant name=".News">
    <obsolete>
      Obsoleted as of 2021-11. The experiment has ended.
    </obsolete>
  </variant>
  <variant name=".Organic">
    <obsolete>
      Obsoleted as of 2021-11. The experiment has ended.
    </obsolete>
  </variant>
</variants>

<variants name="TabSwitchingType">
  <variant name=".NoSavedFrames"
      summary="The time from the input timestamp on a tab switch, until the
               frame is presented on the screen when there is no saved frame
               in the cache."/>
  <variant name=".NoSavedFrames_Loaded"
      summary="Same as NoSavedFrames with the destination tab being loaded
               (frozen or not frozen)"/>
  <variant name=".NoSavedFrames_Loaded_Frozen"
      summary="Same as NoSavedFrames with the destination tab being loaded and
               frozen.">
    <obsolete>
      Frozen is no longer a supported state.
    </obsolete>
  </variant>
  <variant name=".NoSavedFrames_Loaded_NotFrozen"
      summary="Same as NoSavedFrames with the destination tab being loaded and
               not frozen.">
    <obsolete>
      Frozen is no longer a supported state.
    </obsolete>
  </variant>
  <variant name=".NoSavedFrames_NotLoaded"
      summary="Same as WithSavedFrames with the destination tab being
               unloaded."/>
  <variant name=".WithSavedFrames"
      summary="There is a saved frame in the cache when the tab switch
               starts."/>
</variants>

<histogram name="Browser.AnyWindowHasName" enum="Boolean"
    expires_after="2022-09-30">
  <owner>ellyjones@chromium.org</owner>
  <owner>lgrey@chromium.org</owner>
  <summary>
    Whether any browser window in the current session has a user-set name.
    Logged once every histogram recording.
  </summary>
</histogram>

<histogram name="Browser.BitmapFetcher.Decode" units="ms"
    expires_after="2022-05-08">
  <owner>manukh@chromium.org</owner>
  <owner>jdonnelly@chromium.org</owner>
  <owner>chrome-omnibox-team@google.com</owner>
  <summary>The time elapsed decoding an image using BitmapFetcher.</summary>
</histogram>

<histogram name="Browser.BitmapFetcher.Fetch" units="ms"
    expires_after="2022-03-06">
  <owner>manukh@chromium.org</owner>
  <owner>jdonnelly@chromium.org</owner>
  <owner>chrome-omnibox-team@google.com</owner>
  <summary>
    The time elapsed fetching an image from a URL using BitmapFetcher.
  </summary>
</histogram>

<histogram name="Browser.ChromeOS.HatsSatisfaction{Survey}" units="score"
    expires_after="2022-08-01">
  <owner>aalsum@chromium.org</owner>
  <owner>cros-telemetry@google.com</owner>
  <summary>
    Records the overall satisfaction score for HaTS, to be analyzed against
    other OS metrics like performance or number of crashes. There is one score
    per survey type.
  </summary>
  <token key="Survey">
    <variant name=".ArcGames"/>
    <variant name=".Audio"/>
    <variant name=".Ent"/>
    <variant name=".General"/>
    <variant name=".OnboardingExperience"/>
    <variant name=".SmartLock"/>
    <variant name=".Stability"/>
    <variant name=".Unlock"/>
  </token>
</histogram>

<histogram name="Browser.ChromeOS.HatsStatus" enum="HatsStatus"
    expires_after="2022-08-01">
  <owner>aalsum@chromium.org</owner>
  <owner>cros-telemetry@google.com</owner>
  <summary>
    Records the stage up to which the user interacted with the HaTS Chrome OS
    survey. This is needed in addition to the Hats metrics data since Chrome OS
    relies on client side logic to roll the dice for device selection. This is
    recorded when the Hats pipeline ends processing, which is usually when the
    controller is destroyed.
  </summary>
</histogram>

<histogram
    name="Browser.ContinuousSearch.BackNavigationToSrp{ExperimentCategory}"
    units="count" expires_after="2021-12-20">
  <obsolete>
    Obsoleted as of 2021-11. The experiment has ended.
  </obsolete>
  <owner>ckitagawa@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <summary>
    Records the number of back navigations to the Google search result page
    while in a search session. It is emitted when the session is considered
    ended. Different actions that cause the search session to end include
    navigating away from SRP (or one of the pages linked in SRP), closing the
    SRP tab and closing the browser.
  </summary>
  <token key="ExperimentCategory">
    <variant name="">
      <obsolete>
        Deprecated 2021-02. Replaced by experiment arm suffixes.
      </obsolete>
    </variant>
    <variant name=".News"/>
    <variant name=".Organic"/>
  </token>
</histogram>

<histogram name="Browser.ContinuousSearch.DismissalCount" units="count"
    expires_after="2021-12-12">
  <obsolete>
    Obsoleted as of 2021-11. The experiment has ended.
  </obsolete>
  <owner>ckitagawa@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <summary>
    Records the number of dismissals of the Continuous Search feature. It is
    emitted when the Continuous Search UI is dismissed via the dismiss button.
    This metric is only emitted if permanent dismissal is enabled and the UI is
    not permanently dismissed.
  </summary>
</histogram>

<histogram name="Browser.ContinuousSearch.NumberOfSearchResultsExtracted"
    units="count" expires_after="2022-04-17">
  <obsolete>
    Obsoleted as of 2021-11. The experiment has ended.
  </obsolete>
  <owner>ckitagawa@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <summary>
    Records the number of search results extracted. It is emitted when results
    for a Google search results page are extracted by the browser when the
    continuous search mode is enabled.
  </summary>
</histogram>

<histogram name="Browser.ContinuousSearch.SearchResultExtractionStatus"
    enum="SearchResultExtractorClientStatus" expires_after="2022-04-10">
  <obsolete>
    Obsoleted as of 2021-11. The experiment has ended.
  </obsolete>
  <owner>ckitagawa@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <summary>
    Records the status of the search result extraction. It is emitted when
    results for a Google search results page are extracted by the browser when
    the continuous search mode is enabled.
  </summary>
</histogram>

<histogram
    name="Browser.ContinuousSearch.UI.CarouselScrolled2{ExperimentCategory}"
    enum="Boolean" expires_after="2021-09-20">
  <obsolete>
    Obsoleted as of 2021-07. It is replaced by
    Browser.ContinuousSearch.UI.CarouselScrolled3 as the emission method has
    changed.
  </obsolete>
  <owner>ckitagawa@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <summary>
    Records whether the UI was scrolled while being shown. It is emmited when
    the CSN session is considered ended. Actions that can end the session
    include closing the tab, navigating away from the CSN url list or dismissing
    the UI.
  </summary>
  <token key="ExperimentCategory" variants="ContinuousSearchExperiment"/>
</histogram>

<histogram
    name="Browser.ContinuousSearch.UI.CarouselScrolled3{ExperimentCategory}"
    enum="Boolean" expires_after="2021-12-20">
  <obsolete>
    Obsoleted as of 2021-11. The experiment has ended.
  </obsolete>
  <owner>ckitagawa@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <summary>
    Records whether the UI was scrolled while being shown. It is emmited when
    the CSN session is considered ended. Actions that can end the session
    include closing the tab, navigating away from the CSN url list or dismissing
    the UI. This ignores programmatic scrolls of the carousel.
  </summary>
  <token key="ExperimentCategory" variants="ContinuousSearchExperiment"/>
</histogram>

<histogram
    name="Browser.ContinuousSearch.UI.CarouselScrolled{ExperimentCategory}"
    enum="Boolean" expires_after="2021-09-20">
  <obsolete>
    Obsoleted as of 2021-07. It is replaced by
    Browser.ContinuousSearch.UI.CarouselScrolled2 as the emission method has
    changed.
  </obsolete>
  <owner>ckitagawa@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <summary>
    Records whether the UI was scrolled while being shown. It it emmited when
    the UI gets hidden.
  </summary>
  <token key="ExperimentCategory" variants="ContinuousSearchExperiment"/>
</histogram>

<histogram
    name="Browser.ContinuousSearch.UI.ClickedItemPosition{ExperimentCategory}"
    units="position" expires_after="2021-12-20">
  <obsolete>
    Obsoleted as of 2021-11. The experiment has ended.
  </obsolete>
  <owner>ckitagawa@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <summary>
    Records the 0-indexed position of list item in the UI when the user clicks
    on the item.
  </summary>
  <token key="ExperimentCategory" variants="ContinuousSearchExperiment"/>
</histogram>

<histogram
    name="Browser.ContinuousSearch.UI.DismissButtonClicked{ExperimentCategory}"
    enum="Boolean" expires_after="2021-12-20">
  <obsolete>
    Obsoleted as of 2021-11. The experiment has ended.
  </obsolete>
  <owner>ckitagawa@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <summary>
    Records whether the UI dismiss button was pressed while UI was being shown.
    It is emmited when the CSN session is considered ended. Actions that can end
    the session include closing the tab, navigating away from the CSN url list
    or dismissing the UI.
  </summary>
  <token key="ExperimentCategory" variants="ContinuousSearchExperiment"/>
</histogram>

<histogram
    name="Browser.ContinuousSearch.UI.ItemClickedAtLeastOnce{ExperimentCategory}"
    enum="Boolean" expires_after="2021-12-20">
  <obsolete>
    Obsoleted as of 2021-11. The experiment has ended.
  </obsolete>
  <owner>ckitagawa@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <summary>
    Records whether any item was pressed while UI was being shown. It is emmited
    when the CSN session is considered ended. Actions that can end the session
    include closing the tab, navigating away from the CSN url list or dismissing
    the UI.
  </summary>
  <token key="ExperimentCategory" variants="ContinuousSearchExperiment"/>
</histogram>

<histogram
    name="Browser.ContinuousSearch.UI.ProviderButtonClicked{ExperimentCategory}"
    enum="Boolean" expires_after="2021-12-20">
  <obsolete>
    Obsoleted as of 2021-11. The experiment has ended.
  </obsolete>
  <owner>ckitagawa@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <summary>
    Records whether the provider button was pressed while UI was being shown. It
    is emmited when the CSN session is considered ended. Actions that can end
    the session include closing the tab, navigating away from the CSN url list
    or dismissing the UI.
  </summary>
  <token key="ExperimentCategory" variants="ContinuousSearchExperiment"/>
</histogram>

<histogram name="Browser.DarkModeStatus" enum="DarkModeStatus"
    expires_after="2022-08-29">
  <owner>lgrey@chromium.org</owner>
  <owner>robliao@chromium.org</owner>
  <summary>
    Whether the user's system is in dark mode, light mode, or if this choice is
    unavailable due to lack of system support. Updated every UMA upload.
  </summary>
</histogram>

<histogram name="Browser.PaintPreview.Capture.CompressedOnDiskSize" units="KB"
    expires_after="2022-06-05">
  <owner>ckitagawa@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <summary>
    Records the size of a compressed on-disk capture for the paint preview after
    a proto is written to disk if compressed.
  </summary>
</histogram>

<histogram name="Browser.PaintPreview.Capture.NumberOfFramesCaptured"
    units="units" expires_after="2022-06-05">
  <owner>ckitagawa@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <summary>
    Records the number of frames captured by a paint preview if it succeeded.
  </summary>
</histogram>

<histogram name="Browser.PaintPreview.Capture.Success" enum="BooleanSuccess"
    expires_after="2022-06-05">
  <owner>ckitagawa@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <summary>
    Records a boolean indicating whether a capture attempt was successful.
  </summary>
</histogram>

<histogram name="Browser.PaintPreview.Capture.TotalCaptureDuration" units="ms"
    expires_after="2022-06-05">
  <owner>ckitagawa@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <summary>
    Records the total time spent capturing a paint preview of a page. This
    includes capture and serialization of all frames and IPC time.
  </summary>
</histogram>

<histogram name="Browser.PaintPreview.Capture.UncompressedOnDiskSize"
    units="KB" expires_after="2021-10-31">
  <obsolete>
    Obsoleted on 2021-11-09 as uncompressed captures were never being stored.
  </obsolete>
  <owner>ckitagawa@chromium.org</owner>
  <owner>mahmoudi@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <summary>
    Records the size of an uncompressed on-disk capture for the paint preview
    after a proto is written to disk if not compressed.
  </summary>
</histogram>

<histogram name="Browser.PaintPreview.CaptureExperiment.CompressedOnDiskSize"
    units="KB" expires_after="2020-12-20">
  <obsolete>
    Obsoleted on 2020-11-17 as corresponding experiment code was removed and the
    experiment wrapped up.
  </obsolete>
  <owner>ckitagawa@chromium.org</owner>
  <owner>mahmoudi@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <summary>
    Records the compressed on-disk size of the capture if it succeeded for the
    capture experiment.
  </summary>
</histogram>

<histogram name="Browser.PaintPreview.CaptureExperiment.Success"
    enum="BooleanSuccess" expires_after="2020-12-20">
  <obsolete>
    Obsoleted on 2020-11-17 as corresponding experiment code was removed and the
    experiment wrapped up.
  </obsolete>
  <owner>ckitagawa@chromium.org</owner>
  <owner>mahmoudi@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <summary>
    Records the ratio of success to failure for the Paint Preview capture
    experiment.
  </summary>
</histogram>

<histogram name="Browser.PaintPreview.Player.CompositorProcessStartedCorrectly"
    units="BooleanSuccess" expires_after="2022-04-17">
  <owner>ckitagawa@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <summary>
    Records if the paint preview compositor process started correctly.
  </summary>
</histogram>

<histogram name="Browser.PaintPreview.Player.CompositorProcessStartupTime"
    units="ms" expires_after="2022-07-11">
  <owner>ckitagawa@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <summary>
    Records the time it took to start the paint preview compositor process.
  </summary>
</histogram>

<histogram name="Browser.PaintPreview.Player.LinkClicked"
    units="BooleanSuccess" expires_after="2022-06-12">
  <owner>ckitagawa@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <summary>Records when a link is clicked in the paint preview player.</summary>
</histogram>

<histogram name="Browser.PaintPreview.Player.TimeToFirstBitmap" units="ms"
    expires_after="2022-07-11">
  <owner>ckitagawa@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <summary>
    Records the time taken to from the request to start the compositor process
    to the first bitmap being loaded.
  </summary>
</histogram>

<histogram name="Browser.PaintPreview.TabbedPlayer.CompositorFailureReason"
    enum="TabbedPaintPreviewCompositorFailureReason" expires_after="2022-06-12">
  <owner>ckitagawa@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <summary>
    Records the the reason for exiting the compositor process for the
    TabbedPaintPreviewPlayer. Recorded when the compositor returns an error or
    disconnects.
  </summary>
</histogram>

<histogram name="Browser.PaintPreview.TabbedPlayer.ExitCause"
    enum="TabbedPaintPreviewExitCause" expires_after="2022-06-05">
  <owner>ckitagawa@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <summary>
    Records the the reason for exiting TabbedPaintPreviewPlayer. Recorded when
    paint preview is removed.
  </summary>
</histogram>

<histogram name="Browser.PaintPreview.TabbedPlayer.FirstPaintBeforeTabLoad"
    units="Boolean" expires_after="2022-04-10">
  <owner>ckitagawa@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <summary>
    Records whether paint preview was drawn before the tab finished loading.
    Recorded when tab has finished loading.
  </summary>
</histogram>

<histogram name="Browser.PaintPreview.TabbedPlayer.HadCapture" units="Boolean"
    expires_after="2022-06-19">
  <owner>ckitagawa@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <summary>
    Records whether a paint preview exists. Recorded when attempting to show a
    preview on startup. This in conjuction with CompositorFailureReason gives
    the total number of failures to show a paint preview.
  </summary>
</histogram>

<histogram name="Browser.PaintPreview.TabbedPlayer.SnackbarCount" units="units"
    expires_after="2022-06-12">
  <owner>ckitagawa@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <summary>
    Records the number of times that the upgrade snackbar was shown in a session
    of TabbedPaintPreviewPlayer. Recorded when paint preview is removed.
  </summary>
</histogram>

<histogram name="Browser.PaintPreview.TabbedPlayer.TimeToFirstBitmap"
    units="ms" expires_after="2022-07-11">
  <owner>ckitagawa@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <summary>
    Records the time taken to from actvity creation to the first bitmap being
    shown. Recorded on first paint preview paint event.
  </summary>
</histogram>

<histogram
    name="Browser.PaintPreview.TabbedPlayer.UpTime{TabbedPaintPreviewPlayerUptime}"
    units="ms" expires_after="2022-03-31">
  <owner>ckitagawa@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <summary>
    Records the length of the time that a session of TabbedPaintPreviewPlayer
    lasts. Recorded when paint preview is removed.
    {TabbedPaintPreviewPlayerUptime}
  </summary>
  <token key="TabbedPaintPreviewPlayerUptime">
    <variant name="">
      <obsolete>
        Base histogram. Use suffixes of this histogram instead.
      </obsolete>
    </variant>
    <variant name=".RemovedByCompositorFailure"
        summary="Removed by compositor failure"/>
    <variant name=".RemovedByLinkClick" summary="Removed by link click"/>
    <variant name=".RemovedByNavigation" summary="Removed by navigation"/>
    <variant name=".RemovedByPullToRefresh"
        summary="Removed by pull to refresh"/>
    <variant name=".RemovedBySnackBar" summary="Removed by SnackBar"/>
    <variant name=".RemovedOnAccessibilityNotSupported"
        summary="Removed on accessibility not supported"/>
    <variant name=".RemovedOnLoad" summary="Removed on load"/>
    <variant name=".RemovedOnOfflineAvailable"
        summary="Removed on offline page available"/>
    <variant name=".RemovedOnTabDestroy" summary="Removed on tab destroy"/>
  </token>
</histogram>

<histogram name="Browser.PaintPreview.TabService.DiskUsageAtStartup" units="KB"
    expires_after="2022-03-06">
  <owner>ckitagawa@chromium.org</owner>
  <owner>yashard@chromium.org</owner>
  <owner>fredmello@chromium.org</owner>
  <summary>
    Records the total disk usage by the Paint Preview Tab Service at startup of
    the profile keyed service.
  </summary>
</histogram>

<histogram name="Browser.Responsiveness.IOJanksTotalPerMinute" units="janks"
    expires_after="2022-06-19">
  <owner>gab@chromium.org</owner>
  <owner>olivierli@chromium.org</owner>
  <summary>
    Similar to Browser.Responsiveness.IOJankyIntervalsPerMinute but sums janky
    events across all foreground threads over the monitored minute rather than
    considering each interval a boolean. This aims to cover a blind spot of
    IOJankyIntervalsPerMinute as it cannot see an improvement where we unblock
    19/20 threads performing I/O. Not reported across system sleep. More details
    @ https://bit.ly/chrome-io-jank-metric
  </summary>
</histogram>

<histogram name="Browser.Responsiveness.IOJankyIntervalsPerMinute"
    units="janks" expires_after="2022-06-12">
  <owner>gab@chromium.org</owner>
  <owner>olivierli@chromium.org</owner>
  <summary>
    This metric is emitted every minute. It reports a number between 0 and 60
    which corresponds to the number of 1 second intervals during the monitored
    minute to which a stalled foreground thread
    ScopedBlockingCall(BlockingType::MAY_BLOCK) was attributed. A stalled call
    is first attributed to the interval in which it began, and is attributed to
    a number of intervals equal to the length of the call, rounded to the
    nearest second. (Before http://crrev.com/c/2314873, the length was truncated
    rather than rounded.) This aims to capture moments where the main thread is
    responsive but the application is not (because things aren't loading). Not
    reported across system sleep. More details @
    https://bit.ly/chrome-io-jank-metric
  </summary>
</histogram>

<histogram name="Browser.Responsiveness.JankyIntervalsPerThirtySeconds2"
    units="janks" expires_after="2022-05-15">
<!-- JankyIntervalsPerThirtySeconds3 is on probation to replace this -->

  <owner>erikchen@chromium.org</owner>
  <owner>fdoray@chromium.org</owner>
  <summary>
    This metric is emitted every 30 seconds after main message loop start, when
    there is user activity. Each 30 second duration is divided into 100ms
    intervals. This metric counts the number of these intervals that were
    &quot;janky&quot;. An interval is janky if during it the UI or IO thread
    executes an &quot;important&quot; task that was queued more than 100 ms ago,
    or a non-important task or a native event handler that started executing
    more than 100 ms ago. See
    https://docs.google.com/document/d/1vDSGFvJblh7yJ3U3RVB_7qZLubyfTbQdQjuN1GoUNkc/edit
    for more details.

    Update (M82 March 2020): Stopped recording background intervals on Android.
  </summary>
</histogram>

<histogram name="Browser.Responsiveness.JankyIntervalsPerThirtySeconds3"
    units="janks" expires_after="2022-06-05">
<!-- on probation: expected to graduate as a go/chrome-browser-guiding-metrics -->

  <owner>etienneb@chromium.org</owner>
  <owner>gab@chromium.org</owner>
  <summary>
    This metric is emitted every 30 seconds after main message loop start, when
    there is user activity. Each 30 second duration is divided into 100ms
    intervals. This metric counts the number of these intervals that were
    &quot;janky&quot;. An interval is janky if during it the UI or IO thread
    executes an &quot;important&quot; task that was queued more than 100 ms ago,
    or a non-important task or a native event handler that started executing
    more than 100 ms ago. See
    https://docs.google.com/document/d/1vDSGFvJblh7yJ3U3RVB_7qZLubyfTbQdQjuN1GoUNkc/edit
    for more details.

    JankyIntervalsPerThirtySeconds3 differs from JankyIntervalsPerThirtySeconds2
    in that it doesn't start recording until the first 30 seconds window *after*
    the main message loop first reached idle. This avoids considering all tasks
    queued during startup as janky and makes for a more accurate ongoing jank
    metric.
  </summary>
</histogram>

<histogram
    name="Browser.Responsiveness.JankyIntervalsPerThirtySeconds{JankyIntervalsPerThirtySeconds}"
    units="janks" expires_after="never">
<!-- expires-never: guiding metric (internal: go/chrome-browser-guiding-metrics) -->

  <owner>erikchen@chromium.org</owner>
  <owner>chrome-analysis-team@google.com</owner>
  <summary>
    This metric is emitted every 30 seconds [when there is user activity]. Each
    30 second duration is divided into 100ms intervals. This metric counts the
    number of these intervals that were &quot;janky&quot;. See
    https://docs.google.com/document/d/1vDSGFvJblh7yJ3U3RVB_7qZLubyfTbQdQjuN1GoUNkc/edit
    for more details.

    On desktop platforms, this metric measures native events, as well as tasks
    posted to the UI and IO threads of the browser process. On Android, this
    metric only measures tasks posted to the UI and IO threads.

    Update (October 27th 2019): The responsiveness::Watcher emitting this metric
    previously started observation before the main message loop was running,
    this resulted in the 99th percentile being mostly comprised of slow startups
    (before the message loop gets to run). This was fixed and a fake-improvement
    in the high percentiles is expected when the fix goes live.

    Update (M82 March 2020): Stopped recording background intervals on Android.

    Due to a bug, this metric does not measure long queueing time as jankiness.
    It only measures jankiness as individual tasks taking a long time to run.
    Given that it's a long-standing bug, this metric will not be modified. We
    are testing a new metric
    Browser.Responsiveness.JankyIntervalsPerThirtySeconds2 that correctly
    accounts for queueing time. See
    https://groups.google.com/a/google.com/forum/#!topic/chrome-scheduler/X32gKl6fW2A
    for more details.

    This histogram is of special interest to the chrome-analysis-team@. Do not
    change its semantics or retire it without talking to them first.
    {JankyIntervalsPerThirtySeconds}
  </summary>
  <token key="JankyIntervalsPerThirtySeconds">
    <variant name=""/>
    <variant name=".Initial"
        summary="The first 30 seconds interval after the message loop starts."/>
    <variant name=".NonStartup"
        summary="Does not include jank in the first 30 seconds [startup].">
      <obsolete>
        This metric is now only recorded after the main message loop starts and
        no longer distinguishes the first 30 seconds as &quot;startup&quot;.
        Startup.BrowserMessageLoopStartTime can be used for the startup phase
        (before the loop is running) and Startup.FirstWebContents.NonEmptyPaint3
        can be used for the user-visible startup performance.
      </obsolete>
    </variant>
    <variant name=".NoSuspend"
        summary="Only counts jank without power suspend/resume.">
      <obsolete>
        This metric is now only recorded after the main message loop starts and
        no longer distinguishes the first 30 seconds as &quot;startup&quot;.
        Startup.BrowserMessageLoopStartTime can be used for the startup phase
        (before the loop is running) and Startup.FirstWebContents.NonEmptyPaint3
        can be used for the user-visible startup performance.
      </obsolete>
    </variant>
    <variant name=".Periodic" summary="All intervals after OnFirstIdle()."/>
    <variant name=".Startup"
        summary="Only counts jank in the first 30 seconds [startup].">
      <obsolete>
        This metric is now only recorded after the main message loop starts and
        no longer distinguishes the first 30 seconds as &quot;startup&quot;.
        Startup.BrowserMessageLoopStartTime can be used for the startup phase
        (before the loop is running) and Startup.FirstWebContents.NonEmptyPaint3
        can be used for the user-visible startup performance.
      </obsolete>
    </variant>
  </token>
</histogram>

<histogram name="Browser.Tabs.InputEventToSelectionTime{TabSwitchInputLatency}"
    units="microseconds" expires_after="2019-08-31">
  <owner>ejoe@google.com</owner>
  <owner>jonross@chromium.org</owner>
  <summary>
    The time between input event timestamp for tab switch and when the
    TabStripModel begins processing the switch. {TabSwitchInputLatency}
  </summary>
  <token key="TabSwitchInputLatency">
    <variant name="">
      <obsolete>
        Base histogram. Use suffixes of this histogram instead.
      </obsolete>
    </variant>
    <variant name=".Keyboard"
        summary="The time it takes from receiving a keyboard input event that
                 leads to the active tab changing to just before the TabStrip
                 notifies its observers of the change."/>
    <variant name=".Mouse"
        summary="The time it takes from receiving a mouse input event that
                 leads to the active tab changing to just before the TabStrip
                 notifies its observers of the change."/>
    <variant name=".Touch"
        summary="The time it takes from receiving a touch input event that
                 leads to the active tab changing to just before the TabStrip
                 notifies its observers of the change."/>
    <variant name=".Wheel"
        summary="The time it takes from receiving a mouse scroll event that
                 leads to the active tab changing to just before the TabStrip
                 notifies its observers of the change."/>
  </token>
</histogram>

<histogram name="Browser.Tabs.SelectionToVisibilityRequestTime"
    units="microseconds" expires_after="2022-06-26">
  <owner>sadrul@chromium.org</owner>
  <owner>sky@chromium.org</owner>
  <summary>
    The time it takes for the browser to request a tab to be visible. Note that
    this only measures the time from the browser deciding to make the tab
    visible (after a click, or keyboard-shortcut to switch tabs), until the tab
    is requested to become visible. The time it takes to actually make the tab
    visible and show on screen is measured in a separate metric, in
    Browser.Tabs.TotalSwitchDuration2.

    This metric uses UMA_HISTOGRAM_CUSTOM_MICROSECONDS_TIMES so only users with
    high resolution clocks will report this metric.
  </summary>
</histogram>

<histogram name="Browser.Tabs.TabSwitchHasRWHV" enum="BooleanExists"
    expires_after="2022-04-26">
  <owner>joenotcharles@google.com</owner>
  <owner>catan-team@chromium.org</owner>
  <summary>
    Reported at the beginning of every tab switch to record whether a
    RenderWidgetHostView existed for the target tab. If not, the
    Browser.Tabs.TabSwitchResult family of metrics will be recorded for the tab
    switch if the TabSwitchMetrics2 feature is enabled (new behaviour) but not
    if it is disabled (existing behaviour). So the count of
    Browser.Tabs.TabSwitchHasRWHV == false should equal the number of extra
    Browser.Tabs.TabSwitchResult records received with the feature enabled.
  </summary>
</histogram>

<histogram name="Browser.Tabs.TabSwitchResult2{TabSwitchingType}"
    enum="TabSwitchResult" expires_after="2022-04-26">
  <owner>fdoray@chromium.org</owner>
  <owner>joenotcharles@google.com</owner>
  <owner>catan-team@chromium.org</owner>
  <summary>
    Whether a frame was presented after a tab switch event. {TabSwitchingType}
  </summary>
  <token key="TabSwitchingType" variants="TabSwitchingType">
    <variant name="">
      <obsolete>
        Base histogram. Use suffixes of this histogram instead.
      </obsolete>
    </variant>
  </token>
</histogram>

<histogram name="Browser.Tabs.TabSwitchResult{TabSwitchingType}"
    enum="TabSwitchResult" expires_after="2022-04-26">
  <owner>fdoray@chromium.org</owner>
  <owner>joenotcharles@google.com</owner>
  <owner>catan-team@chromium.org</owner>
  <summary>
    Whether a frame was presented after a tab switch event. Not recorded in
    several cases described at http://shortn/_1wrMKYQjzu. {TabSwitchingType}
  </summary>
  <token key="TabSwitchingType" variants="TabSwitchingType">
    <variant name="">
      <obsolete>
        Base histogram. Use suffixes of this histogram instead.
      </obsolete>
    </variant>
  </token>
</histogram>

<histogram name="Browser.Tabs.TotalIncompleteSwitchDuration2{TabSwitchingType}"
    units="ms" expires_after="2022-04-26">
  <owner>fdoray@chromium.org</owner>
  <owner>jonross@chromium.org</owner>
  <owner>joenotcharles@google.com</owner>
  <owner>catan-team@chromium.org</owner>
  <summary>
    The time between a tab switch input event timestamp and when the tab is
    hidden, if no frame is presented in the meantime. {TabSwitchingType}
  </summary>
  <token key="TabSwitchingType" variants="TabSwitchingType">
    <variant name="">
      <obsolete>
        Base histogram. Use suffixes of this histogram instead.
      </obsolete>
    </variant>
  </token>
</histogram>

<histogram name="Browser.Tabs.TotalIncompleteSwitchDuration{TabSwitchingType}"
    units="ms" expires_after="2022-04-26">
  <owner>fdoray@chromium.org</owner>
  <owner>jonross@chromium.org</owner>
  <owner>joenotcharles@google.com</owner>
  <owner>catan-team@chromium.org</owner>
  <summary>
    The time between a tab switch input event timestamp and when the tab is
    hidden, if no frame is presented in the meantime. Not recorded in several
    cases described at http://shortn/_1wrMKYQjzu. {TabSwitchingType}
  </summary>
  <token key="TabSwitchingType" variants="TabSwitchingType">
    <variant name="">
      <obsolete>
        Base histogram. Use suffixes of this histogram instead.
      </obsolete>
    </variant>
  </token>
</histogram>

<histogram name="Browser.Tabs.TotalSwitchDuration2{TabSwitchingType}"
    units="ms" expires_after="2022-04-26">
  <owner>ejoe@google.com</owner>
  <owner>jonross@chromium.org</owner>
  <owner>joenotcharles@google.com</owner>
  <owner>catan-team@chromium.org</owner>
  <summary>
    The time between the input event timestamp and the frame presentation time
    on a tab switch. {TabSwitchingType}
  </summary>
  <token key="TabSwitchingType" variants="TabSwitchingType">
    <variant name="">
      <obsolete>
        Base histogram. Use suffixes of this histogram instead.
      </obsolete>
    </variant>
  </token>
</histogram>

<histogram name="Browser.Tabs.TotalSwitchDuration{TabSwitchingType}" units="ms"
    expires_after="2022-04-26">
  <owner>ejoe@google.com</owner>
  <owner>jonross@chromium.org</owner>
  <owner>joenotcharles@google.com</owner>
  <owner>catan-team@chromium.org</owner>
  <summary>
    The time between the input event timestamp and the frame presentation time
    on a tab switch. Not recorded in several cases described at
    http://shortn/_1wrMKYQjzu. {TabSwitchingType}
  </summary>
  <token key="TabSwitchingType" variants="TabSwitchingType">
    <variant name="">
      <obsolete>
        Base histogram. Use suffixes of this histogram instead.
      </obsolete>
    </variant>
  </token>
</histogram>

<histogram name="Browser.WindowCount.Guest" units="units"
    expires_after="2022-06-19">
  <owner>rhalavati@chromium.org</owner>
  <owner>chrome-privacy-core@google.com</owner>
  <summary>
    Number of open guest windows at the same time. Recorded when a new guest
    window is created. Please note that this metric double counts the lower
    numbers, meaning that if user opens three windows (without closing any in
    between), then buckets 1, 2, and 3 will all be incremented in turn.
  </summary>
</histogram>

<histogram name="Browser.WindowCount.Incognito" units="units"
    expires_after="2022-06-19">
  <owner>rhalavati@chromium.org</owner>
  <owner>chrome-privacy-core@google.com</owner>
  <summary>
    Number of open incognito windows at the same time. Recorded when a new
    incognito window is created. Please note that this metric double counts the
    lower numbers, meaning that if user opens three windows (without closing any
    in between), then buckets 1, 2, and 3 will all be incremented in turn.
  </summary>
</histogram>

<histogram name="BrowserRenderProcessHost.BackgroundTime" units="ms"
    expires_after="2021-04-04">
  <obsolete>
    Obsoleted on 2021-01-22 as corresponding experiment code was removed and the
    experiment wrapped up.
  </obsolete>
  <owner>johnidel@chromium.org</owner>
  <owner>chrome-ads-histograms@google.com</owner>
  <summary>
    Record the time spent in the background after RenderProcessHost
    initialization of the process. Recorded when the RenderProcessHost for the
    process is destroyed.
  </summary>
</histogram>

<histogram name="BrowserRenderProcessHost.ChildCodeIntegrityFailures"
    enum="RendererType" expires_after="never">
<!-- expires-never: For monitoring stability regressions. -->

  <owner>wfh@chromium.org</owner>
  <owner>chrome-stability-core@google.com</owner>
  <summary>
    Count of renderer process terminations due to a code integrity failure,
    grouped by type. This is only reported on Windows.
  </summary>
</histogram>

<histogram name="BrowserRenderProcessHost.ChildCrashes" enum="RendererType"
    expires_after="never">
<!-- expires-never: For monitoring stability regressions. -->

  <owner>wfh@chromium.org</owner>
  <owner>chrome-stability-core@google.com</owner>
  <summary>Count of renderer process crashes grouped by type.</summary>
</histogram>

<histogram name="BrowserRenderProcessHost.ChildKills" enum="RendererType"
    expires_after="never">
<!-- expires-never: For monitoring stability regressions. -->

  <owner>wfh@chromium.org</owner>
  <owner>chrome-stability-core@google.com</owner>
  <summary>Count of renderer process kills grouped by type.</summary>
</histogram>

<histogram name="BrowserRenderProcessHost.ChildKills.OOM" enum="RendererType"
    expires_after="never">
<!-- expires-never: For monitoring stability regressions. -->

  <owner>oshima@chromium.org</owner>
  <owner>chrome-stability-core@google.com</owner>
  <summary>
    Out of BrowserRenderProcessHost.ChildKills, numer of kills due to SIGKILL,
    which is a strong signal of out of memory on Chrome OS, grouped by renderer
    type.
  </summary>
</histogram>

<histogram name="BrowserRenderProcessHost.ChildLaunchFailureCodes"
    enum="LaunchErrorCodes" expires_after="never">
<!-- expires-never: For monitoring stability regressions. -->

  <owner>wfh@chromium.org</owner>
  <owner>chrome-stability-core@google.com</owner>
  <summary>
    The launch error codes for failed renderer process launches.
  </summary>
</histogram>

<histogram name="BrowserRenderProcessHost.ChildLaunchFailures"
    enum="RendererType" expires_after="never">
<!-- expires-never: For monitoring stability regressions. -->

  <owner>wfh@chromium.org</owner>
  <owner>chrome-stability-core@google.com</owner>
  <summary>Count of renderer process launch failures grouped by type.</summary>
</histogram>

<histogram name="BrowserRenderProcessHost.DisconnectedAlive"
    enum="RendererType" expires_after="never">
<!-- expires-never: For monitoring stability regressions. -->

  <owner>wfh@chromium.org</owner>
  <owner>chrome-stability-core@google.com</owner>
  <summary>
    Count of renderer process crashes that we miscounted because we took the
    exit code too early. Grouped by type.
  </summary>
</histogram>

<histogram name="BrowserRenderProcessHost.FramePrioritiesSeen"
    enum="FramePrioritiesSeen" expires_after="2021-06-13">
  <obsolete>
    Obsoleted on 2021-01-22 as corresponding experiment code was removed and the
    experiment wrapped up.
  </obsolete>
  <owner>csharrison@chromium.org</owner>
  <owner>chrome-ads-histograms@google.com</owner>
  <summary>
    Determines what combination of low and normal priority frames were attached
    to a render process during its lifetime. Recorded when the host for the
    render process is destroyed.
  </summary>
</histogram>

<histogram name="BrowserRenderProcessHost.InvisibleMediaStreamFrameDepth"
    units="frame_depth" expires_after="M72">
  <owner>boliu@chromium.org</owner>
  <owner>alexmos@chromium.org</owner>
  <summary>
    Recorded at most once per renderer process when it first becomes invisible
    and has media stream. Record the frame depth of the process. Note this
    metric is only meaningful when some form of OOPIF is enabled; otherwise
    frame depth is always 0.
  </summary>
</histogram>

<histogram name="BrowserRenderProcessHost.LabeledInTaskManager"
    units="BooleanLabeledRendererTask" expires_after="2022-09-01">
  <owner>creis@chromium.org</owner>
  <owner>avi@chromium.org</owner>
  <summary>
    Reports false each time the Task Manager displays an unlabeled renderer
    process using the fallback task provider, indicating that a type of renderer
    process is missing a task provider, which is a bug. For comparison, this
    reports true when renderer processes are properly labeled by a primary task
    provider. These values are only reported when the Task Manager is open. This
    can be removed when no unlabeled cases remain, per https://crbug.com/739782.
  </summary>
</histogram>

<histogram name="BrowserRenderProcessHost.SpareProcessMaybeTakeAction"
    enum="SpareProcessMaybeTakeAction" expires_after="2022-07-11">
  <owner>alexmos@chromium.org</owner>
  <owner>lukasza@chromium.org</owner>
  <summary>
    Records what happens when an attempt is made to use a spare
    RenderProcessHost - logs that either the attempt succeeded or why it failed.
  </summary>
</histogram>

<histogram name="BrowserRenderProcessHost.TotalTime" units="ms"
    expires_after="2021-06-06">
  <obsolete>
    Obsoleted on 2021-01-22 as corresponding experiment code was removed and the
    experiment wrapped up.
  </obsolete>
  <owner>johnidel@chromium.org</owner>
  <owner>chrome-ads-histograms@google.com</owner>
  <summary>
    Record the lifetime of the RenderProcessHost after initialization of the
    process. Recorded when the RenderProcessHost for the process is destroyed.
  </summary>
</histogram>

<histogram name="BrowserServices.BrowsableIntentCheck" units="ms"
    expires_after="M104">
  <owner>peconn@chromium.org</owner>
  <owner>peter@chromium.org</owner>
  <summary>
    Triggered when we check whether a Trusted Web Activity client app can handle
    Browsable Intents. It measures how long consulting the Android
    PackageManager takes.
  </summary>
</histogram>

<histogram name="BrowserServices.ClientAppDataLoad" units="ms"
    expires_after="2022-04-24">
  <owner>peconn@chromium.org</owner>
  <owner>peter@chromium.org</owner>
  <summary>
    Triggered when any Android app is uninstalled or has its data cleared. This
    measures how long it takes to read data from Preferences to determine
    whether we need to act.
  </summary>
</histogram>

<histogram name="BrowserServices.ServiceTabResolveInfoQuery" units="ms"
    expires_after="2022-05-01">
  <owner>peconn@chromium.org</owner>
  <owner>peter@chromium.org</owner>
  <summary>
    Triggered when an Android background service attempts to create a Tab. We
    time how long the Android package manager queryIntentActivities call takes.
  </summary>
</histogram>

<histogram name="BrowserServices.TwaOpenTime.V2" units="ms"
    expires_after="2022-04-17">
  <owner>peconn@chromium.org</owner>
  <owner>peter@chromium.org</owner>
  <summary>
    Triggered when a TrustedWebActivity is paused, recording the time since it
    had been resumed.
  </summary>
</histogram>

<histogram name="BrowserServices.VerificationResult"
    enum="BrowserServicesVerificationResult" expires_after="2022-05-01">
  <owner>peconn@chromium.org</owner>
  <owner>peter@chromium.org</owner>
  <summary>
    The result of Digital Asset Link verification performed when starting a
    Trusted Web Activity.
  </summary>
</histogram>

<histogram name="BrowserServices.VerificationTime.Offline" units="ms"
    expires_after="M104">
  <owner>peconn@chromium.org</owner>
  <owner>peter@chromium.org</owner>
  <summary>
    Triggered when Trusted Web Activity verification completes. Records how long
    it takes the device to realise it is offline and fall back to the cached
    result.
  </summary>
</histogram>

<histogram name="BrowserServices.VerificationTime.Online" units="ms"
    expires_after="M104">
  <owner>peconn@chromium.org</owner>
  <owner>peter@chromium.org</owner>
  <summary>
    Triggered when Trusted Web Activity verification completes. Records how long
    verification took when online.
  </summary>
</histogram>

<histogram name="BrowserSwitcher.AlternativeBrowser" enum="BrowserType"
    expires_after="2022-06-05">
  <owner>nicolaso@chromium.org</owner>
  <owner>pastarmovj@chromium.org</owner>
  <summary>
    Records which browser the Legacy Browser Support feature is configured to
    open (which defaults to IE). Recorded on browser startup, and when the value
    changes. Only measured when Legacy Browser Support is enabled via the
    BrowserSwitcher* policies. Desktop Chrome only.
  </summary>
</histogram>

<histogram name="BrowserSwitcher.CacheFile.MkDirSuccess" enum="BooleanSuccess"
    expires_after="2022-06-05">
  <owner>nicolaso@chromium.org</owner>
  <owner>pastarmovj@chromium.org</owner>
  <summary>
    Records whether the &quot;AppData/Local/Google/BrowserSwitcher&quot;
    directory was successfully created. Windows only.
  </summary>
</histogram>

<histogram name="BrowserSwitcher.CacheFile.MkTempSuccess" enum="BooleanSuccess"
    expires_after="2022-06-05">
  <owner>nicolaso@chromium.org</owner>
  <owner>pastarmovj@chromium.org</owner>
  <summary>
    Records whether a temp file in
    &quot;AppData/Local/Google/BrowserSwitcher&quot; the directory was
    successfully created. Windows only.
  </summary>
</histogram>

<histogram name="BrowserSwitcher.CacheFile.MoveSuccess" enum="BooleanSuccess"
    expires_after="2022-06-05">
  <owner>nicolaso@chromium.org</owner>
  <owner>pastarmovj@chromium.org</owner>
  <summary>
    Records whether the temp file in
    &quot;AppData/Local/Google/BrowserSwitcher&quot; directory was successfully
    moved to its final destination (&quot;cache.dat&quot;) after writing its
    contents. Windows only.
  </summary>
</histogram>

<histogram name="BrowserSwitcher.Decision" enum="BooleanBrowserSwitch"
    expires_after="2022-06-05">
  <owner>nicolaso@chromium.org</owner>
  <owner>pastarmovj@chromium.org</owner>
  <summary>
    On navigation and redirect, whether to switch browsers or not. Only measured
    when Legacy Browser Support is enabled via the BrowserSwitcher* policies.
    When this is true, Chrome attempts to launch an alternative browser
    (typically IE) with the navigation URL. Desktop Chrome only.
  </summary>
</histogram>

<histogram name="BrowserSwitcher.DecisionTime" units="ms"
    expires_after="2022-06-05">
  <owner>nicolaso@chromium.org</owner>
  <owner>pastarmovj@chromium.org</owner>
  <summary>
    On navigation and redirect, records how long it took to compute a decision
    (stay in Chrome/open in IE). Only measured when Legacy Browser Support is
    enabled via the BrowserSwitcher* policies. Desktop Chrome only.
  </summary>
</histogram>

<histogram name="BrowserSwitcher.ExternalGreylistSize" units="rules"
    expires_after="2022-06-05">
  <owner>nicolaso@chromium.org</owner>
  <owner>pastarmovj@chromium.org</owner>
  <summary>
    Number of rules that come from an external greylist XML file. Measured when
    the sitelist is loaded during browser startup. Desktop Chrome only.
  </summary>
</histogram>

<histogram name="BrowserSwitcher.ExternalSitelistSize" units="rules"
    expires_after="2022-06-05">
  <owner>nicolaso@chromium.org</owner>
  <owner>pastarmovj@chromium.org</owner>
  <summary>
    Number of rules that come from an external sitelist XML file. Measured when
    the sitelist is loaded during browser startup. Desktop Chrome only.
  </summary>
</histogram>

<histogram name="BrowserSwitcher.GreylistSize" units="rules"
    expires_after="2022-06-05">
  <owner>nicolaso@chromium.org</owner>
  <owner>pastarmovj@chromium.org</owner>
  <summary>
    Number of rules in the BrowserSwitcherUrlGreylist policy. Measured when the
    policy is loaded. Desktop Chrome only.
  </summary>
</histogram>

<histogram name="BrowserSwitcher.GreylistWildcard" enum="BooleanPresent"
    expires_after="2022-06-05">
  <owner>nicolaso@chromium.org</owner>
  <owner>pastarmovj@chromium.org</owner>
  <summary>
    Whether there is a wildcard (&quot;*&quot;) rule in the
    BrowserSwitcherUrlGreylist policy. Measured when the
    BrowserSwitcherUrlGreylist policy gets updated. Desktop Chrome only.
  </summary>
</histogram>

<histogram name="BrowserSwitcher.IeemSitelistSize" units="rules"
    expires_after="2022-06-05">
  <owner>nicolaso@chromium.org</owner>
  <owner>pastarmovj@chromium.org</owner>
  <summary>
    Number of rules that come from Internet Explorer Enterprise Mode's sitelist.
    Measured when the sitelist is loaded during browser startup. Windows only.
  </summary>
</histogram>

<histogram name="BrowserSwitcher.LaunchSuccess" enum="BooleanSuccess"
    expires_after="2022-06-05">
  <owner>nicolaso@chromium.org</owner>
  <owner>pastarmovj@chromium.org</owner>
  <summary>
    Records whether an attempt to launch an alternate browser failed or
    succeeded. Desktop Chrome only.
  </summary>
</histogram>

<histogram name="BrowserSwitcher.LaunchTime" units="ms"
    expires_after="2022-06-05">
  <owner>nicolaso@chromium.org</owner>
  <owner>pastarmovj@chromium.org</owner>
  <summary>
    Records how long it took to launch an alternate browser (regardless of
    whether it failed or succeeded). Desktop Chrome only.
  </summary>
</histogram>

<histogram name="BrowserSwitcher.UrlListSize" units="rules"
    expires_after="2022-06-05">
  <owner>nicolaso@chromium.org</owner>
  <owner>pastarmovj@chromium.org</owner>
  <summary>
    Number of rules in the BrowserSwitcherUrlList policy. Measured when the
    policy gets updated. Desktop Chrome only.
  </summary>
</histogram>

<histogram name="BrowserSwitcher.UrlListWildcard" enum="BooleanPresent"
    expires_after="2022-06-05">
  <owner>nicolaso@chromium.org</owner>
  <owner>pastarmovj@chromium.org</owner>
  <summary>
    Whether there is a wildcard (&quot;*&quot;) rule in the
    BrowserSwitcherUrlList policy. Measured when the BrowserSwitcherUrlList
    policy gets updated. Desktop Chrome only.
  </summary>
</histogram>

<histogram name="InfoBar.Shown" enum="InfoBarIdentifier" expires_after="never">
<!-- expires-never: Required as long as infobars exist. -->

  <owner>rkaplow@chromium.org</owner>
  <owner>src/components/infobars/OWNERS</owner>
  <summary>
    Records how many times a particular infobar was shown to the user. On
    Android, the infobar may be partially hidden due to stacking. On desktop, a
    tab with a visible infobar will increment this histogram every time the user
    switches away from the tab and back to it with the infobar still visible.
  </summary>
</histogram>

<histogram name="InfoBar.Shown.Hidden" enum="InfoBarIdentifier"
    expires_after="never">
<!-- expires-never: Required as long as infobars exist. -->

  <owner>mdjones@chromium.org</owner>
  <summary>
    Records how many times a particular infobar was displayed in a hidden state
    due to at least one other infobar existing. If there are no existing
    infobars, but the user scrolls at the exact moment a new infobar is added,
    the infobar may be hidden, but not recorded in this metric. Reliably
    triggering and detecting this combination is tricky so it isn't done. Only
    recorded on Android.
  </summary>
</histogram>

<histogram name="InfoBar.Shown.Hiding" enum="InfoBarIdentifier"
    expires_after="never">
<!-- expires-never: Required as long as infobars exist. -->

  <owner>mdjones@chromium.org</owner>
  <summary>
    Records how many times a particular infobar was visible and hiding a new
    infobar behind it. Only recorded on Android.
  </summary>
</histogram>

<histogram name="InfoBar.Shown.Visible" enum="InfoBarIdentifier"
    expires_after="never">
<!-- expires-never: Required as long as infobars exist. -->

  <owner>mdjones@chromium.org</owner>
  <summary>
    Records how many times a particular infobar was displayed in a visible state
    due to no other infobars existing. If there are no existing infobars, but
    the user scrolls at the exact moment a new infobar is added, the infobar may
    be hidden, but recorded here as visible. Reliably triggering and detecting
    this combination is tricky so it isn't done. Only recorded on Android.
  </summary>
</histogram>

</histograms>

</histogram-configuration>