tools/metrics/histograms/metadata/security/histograms.xml

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<!--
This file is used to generate a comprehensive list of Security 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
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<histogram-configuration>

<histograms>

<histogram
    name="Security.CertificateTransparency.MainFrameNavigationCompliance"
    enum="CTComplianceStatus" expires_after="M78">
  <obsolete>
    Expired after M78. No longer in use.
  </obsolete>
  <owner>estark@chromium.org</owner>
  <summary>
    The compliance of each main frame navigation's connection with the
    Certificate Transparency policy. Recorded whenever a main-frame,
    non-same-page navigation is committed. Connections can be compliant, or they
    can be non-compliant for one of several reasons (not enough Signed
    Certificate Timestamps [SCTs], not diverse enough SCTs, or the build was old
    so CT compliance wasn't checked).
  </summary>
</histogram>

<histogram name="Security.ClientAuth.CertificateSelectionSource"
    enum="ClientCertSelectionResult" expires_after="2020-08-16">
  <owner>jdeblasio@chromium.org</owner>
  <summary>
    When TLS client authentication is requested by the server, Chrome must
    choose whether to return a certificate or to abort the handshake. This
    histogram records how this determination was made, either as a result of
    user action, or as chosen automatically due to content settings. It only
    records when a fresh certificate selection would be attempted (and thus
    ignores cache hits). This histogram is recorded in SSLClientAuthObserver for
    user-selected outcomes and in ChromeContentBrowserClient for policy
    outcomes. This histogram does not cover mobile, as certificate handling is
    not handled by Chrome on Android nor iOS.
  </summary>
</histogram>

<histogram name="Security.DataDecoder.Image.DecodingTime" units="ms"
    expires_after="2022-06-12">
  <owner>lukasza@chromium.org</owner>
  <owner>rsesek@chromium.org</owner>
  <summary>
    Logged once for every invocation of `data_decoder::DecodeImage` and/or
    `data_decoder::DecodeImageIsolated`. Logs the time that has elapsed while
    decoding the image (typically this happens in the Utility process). The time
    is recorded in all the cases (including empty input which don't require
    actual image decoding).
  </summary>
</histogram>

<histogram name="Security.DataDecoder.Image.Isolated.EndToEndTime" units="ms"
    expires_after="2022-06-12">
  <owner>lukasza@chromium.org</owner>
  <owner>rsesek@chromium.org</owner>
  <summary>
    Logged once for every invocation of `data_decoder::DecodeImageIsolated`.
    Logs the time that has elapsed between 1) invocation of DecodeImageIsolated
    and 2) calling the completion callback (both of these events happen in the
    Browser process). The elapsed time covers A) spawning the utility process,
    B) decoding the image, C) IPC overhead.

    Note that there are 2 sets of similar metrics:
    Security.DataDecoder.Image.Isolated. and
    Security.DataDecoder.Image.Reusable. In the Isolated case a Utility process
    is spawned for each image decoding operation and the ...End2End and
    ...ProcessOverhead metrics always include process spawning overhead. In the
    Reusable case a Utility process may get reused when decoding a batch of
    images, and the ...End2End and ...ProcessOverhead metrics may or may not
    include process spawning overhead (the process will only need to be spawned
    for the first image in a batch + after the process has been shut down due to
    inactivity).
  </summary>
</histogram>

<histogram name="Security.DataDecoder.Image.Isolated.ProcessOverhead"
    units="ms" expires_after="2022-06-12">
  <owner>lukasza@chromium.org</owner>
  <owner>rsesek@chromium.org</owner>
  <summary>
    Logged once for every invocation of `data_decoder::DecodeImageIsolated`.
    Logs the overhead of using a separate process for decoding the images by
    calculating the difference between ...Image.Isolated.EndToEndTime and the
    ...Image.DecodingTime metrics.

    Note that there are 2 sets of similar metrics:
    Security.DataDecoder.Image.Isolated. and
    Security.DataDecoder.Image.Reusable. In the Isolated case a Utility process
    is spawned for each image decoding operation and the ...End2End and
    ...ProcessOverhead metrics always include process spawning overhead. In the
    Reusable case a Utility process may get reused when decoding a batch of
    images, and the ...End2End and ...ProcessOverhead metrics may or may not
    include process spawning overhead (the process will only need to be spawned
    for the first image in a batch + after the process has been shut down due to
    inactivity).
  </summary>
</histogram>

<histogram name="Security.DataDecoder.Image.Reusable.EndToEndTime" units="ms"
    expires_after="2022-06-12">
  <owner>lukasza@chromium.org</owner>
  <owner>rsesek@chromium.org</owner>
  <summary>
    Logged once for every invocation of `data_decoder::DecodeImage`. Logs the
    time that has elapsed between 1) invocation of DecodeImage and 2) calling
    the completion callback (both of these events happen in the Browser
    process). The elapsed time covers A) spawning the utility process (if
    needed), B) decoding the image, C) IPC overhead.

    Note that there are 2 sets of similar metrics:
    Security.DataDecoder.Image.Isolated. and
    Security.DataDecoder.Image.Reusable. In the Isolated case a Utility process
    is spawned for each image decoding operation and the ...End2End and
    ...ProcessOverhead metrics always include process spawning overhead. In the
    Reusable case a Utility process may get reused when decoding a batch of
    images, and the ...End2End and ...ProcessOverhead metrics may or may not
    include process spawning overhead (the process will only need to be spawned
    for the first image in a batch + after the process has been shut down due to
    inactivity).
  </summary>
</histogram>

<histogram name="Security.DataDecoder.Image.Reusable.ProcessOverhead"
    units="ms" expires_after="2022-06-12">
  <owner>lukasza@chromium.org</owner>
  <owner>rsesek@chromium.org</owner>
  <summary>
    Logged once for every invocation of `data_decoder::DecodeImage`. Logs the
    overhead of using a separate process for decoding the images by calculating
    the difference between ...Image.Reusable.EndToEndTime and the
    ...Image.DecodingTime metrics.

    Note that there are 2 sets of similar metrics:
    Security.DataDecoder.Image.Isolated. and
    Security.DataDecoder.Image.Reusable. In the Isolated case a Utility process
    is spawned for each image decoding operation and the ...End2End and
    ...ProcessOverhead metrics always include process spawning overhead. In the
    Reusable case a Utility process may get reused when decoding a batch of
    images, and the ...End2End and ...ProcessOverhead metrics may or may not
    include process spawning overhead (the process will only need to be spawned
    for the first image in a batch + after the process has been shut down due to
    inactivity).
  </summary>
</histogram>

<histogram name="Security.HttpsFirstMode.NavigationEvent"
    enum="HttpsFirstModeNavigationEvent" expires_after="2022-01-31">
  <owner>cthomp@chromium.org</owner>
  <owner>trusty-transport@chromium.org</owner>
  <summary>
    Events for navigations that are upgraded from HTTP to HTTPS by HTTPS-First
    Mode. Recorded for eligible navigations (HTTP main frame navigations that
    are not allowlisted), if the profile is opted in to HTTPS-First Mode.
  </summary>
</histogram>

<histogram name="Security.HttpsFirstMode.SettingChanged" enum="BooleanEnabled"
    expires_after="2022-06-26">
  <owner>cthomp@chromium.org</owner>
  <owner>trusty-transport@chromium.org</owner>
  <summary>
    Records the HTTPS-First Mode preference state when it changes for a profile.
    Recorded for regular profiles only (not for Incognito, Guest, or Sign-in
    profiles).
  </summary>
</histogram>

<histogram name="Security.HttpsFirstMode.SettingEnabledAtStartup"
    enum="BooleanEnabled" expires_after="2022-06-12">
  <owner>cthomp@chromium.org</owner>
  <owner>trusty-transport@chromium.org</owner>
  <summary>
    Records whether the HTTPS-First Mode preference is enabled at profile
    startup. Recorded for regular profiles only (not for Incognito, Guest, or
    Sign-in profiles).
  </summary>
</histogram>

<histogram name="Security.JSONParser.ChromiumExtensionUsage"
    enum="JsonParserExtension" expires_after="2022-06-26">
  <owner>rsesek@chromium.org</owner>
  <owner>chrome-platform-security@google.com</owner>
  <summary>
    Records the usage of the base::JSONParser's non-RFC-8259-conforming
    extensions when parsing JSON documents. This histogram is emitted each time
    an instance of non-conforming syntax is detected in a document.
  </summary>
</histogram>

<histogram name="Security.LegacyTLS.DownloadStarted" enum="Boolean"
    expires_after="2021-08-09">
  <obsolete>
    Expired after 2021-08. No longer in use.
  </obsolete>
  <owner>cthomp@chromium.org</owner>
  <owner>security-enamel@chromium.org</owner>
  <summary>
    Records whether the page would have a legacy TLS warning (if the user were
    in the appropriate field trial) when a download is initiated from the page
    (*not* the legacy TLS status of the download URL itself). This is recorded
    regardless of whether the warning is actually displayed. This histogram is
    not recorded for downloads that are initiated in a new tab or window, as the
    legacy TLS status of the initiating page cannot be tracked.
  </summary>
</histogram>

<histogram name="Security.LegacyTLS.FormSubmission" enum="Boolean"
    expires_after="2021-08-09">
  <obsolete>
    Expired after 2021-08. No longer in use.
  </obsolete>
  <owner>cthomp@chromium.org</owner>
  <owner>security-enamel@chromium.org</owner>
  <summary>
    Records whether the page would have a legacy TLS warning (if the user were
    in the appropriate field trial) when submitting a form. This is recorded
    whenever a form submission navigation begins. The recorded status is of the
    page the form was submitted from, not the one that the form targets.
  </summary>
</histogram>

<histogram name="Security.LegacyTLS.OnCommit" enum="Boolean"
    expires_after="2021-08-09">
  <obsolete>
    Expired after 2021-08. No longer in use.
  </obsolete>
  <owner>cthomp@chromium.org</owner>
  <owner>estark@chromium.org</owner>
  <owner>security-enamel@chromium.org</owner>
  <summary>
    Records whether the page would have a legacy TLS warning (if the user were
    in the appropriate field trial) when the navigation to the page commits.
  </summary>
</histogram>

<histogram name="Security.LegacyTLS.PageInfo.Action"
    enum="WebsiteSettingsAction" expires_after="M92">
  <obsolete>
    Expired after M92. No longer in use.
  </obsolete>
  <owner>cthomp@chromium.org</owner>
  <owner>security-enamel@chromium.org</owner>
  <summary>
    Tracks Page Info bubble actions along with whether the page would have a
    legacy TLS warning (if the user were in the appropriate field trial).
  </summary>
</histogram>

<histogram name="Security.MixedForm.InterstitialTriggerState"
    enum="MixedFormInterstitialTriggeredState" expires_after="2022-06-26">
  <owner>carlosil@chromium.org</owner>
  <owner>security-enamel@chromium.org</owner>
  <summary>
    Logs when an interstitial was triggered (or would have been triggered but
    was not due to the currently enabled experiment mode) and whether it was a
    direct submission to an insecure URL, or a redirect through one.
  </summary>
</histogram>

<histogram base="true" name="Security.PageEndReason" enum="PageEndReason"
    expires_after="2022-04-10">
  <owner>cthomp@chromium.org</owner>
  <owner>security-enamel@chromium.org</owner>
  <summary>
    Records the reason the page visit ended (e.g., reload, tab closed, new
    navigation, etc.) for page loads that committed.
  </summary>
</histogram>

<histogram name="Security.PageInfo.AboutThisSiteStatus"
    enum="AboutThisSiteStatus" expires_after="M101">
  <owner>dullweber@chromium.org</owner>
  <owner>olesiamarukhno@chromium.org</owner>
  <summary>
    Tracks status of AboutThisSite queries. Recorded every time PageInfo is
    opened and information about a site is requested.
  </summary>
</histogram>

<histogram name="Security.PageInfo.Action.HttpsUrl.Dangerous"
    enum="WebsiteSettingsAction" expires_after="M77">
  <obsolete>
    Expired after M77. No longer in use.
  </obsolete>
  <owner>estark@chromium.org</owner>
  <summary>
    Tracks Page Info bubble actions that take place on an HTTPS URL that has
    been marked dangerous or not secure (such as for malware or broken HTTPS).
  </summary>
</histogram>

<histogram name="Security.PageInfo.Action.HttpsUrl.Downgraded"
    enum="WebsiteSettingsAction" expires_after="M81">
  <obsolete>
    Expired after M81. No longer in use.
  </obsolete>
  <owner>estark@chromium.org</owner>
  <summary>
    Tracks Page Info bubble actions that take place on a valid HTTPS URL that
    has a security issue (e.g. mixed content).
  </summary>
</histogram>

<histogram name="Security.PageInfo.Action.HttpsUrl.ValidEV"
    enum="WebsiteSettingsAction" expires_after="M81">
  <obsolete>
    Expired after M81. No longer in use.
  </obsolete>
  <owner>estark@chromium.org</owner>
  <summary>
    Tracks Page Info bubble actions that take place on a valid HTTPS URL with no
    security issues (e.g. no mixed content) and an Extended Validation
    Certificate.
  </summary>
</histogram>

<histogram name="Security.PageInfo.Action.HttpsUrl.ValidNonEV"
    enum="WebsiteSettingsAction" expires_after="M81">
  <obsolete>
    Expired after M81. No longer in use.
  </obsolete>
  <owner>estark@chromium.org</owner>
  <summary>
    Tracks Page Info bubble actions that take place on a valid HTTPS URL with no
    security issues (e.g. no mixed content), but no Extended Validation
    Certificate.
  </summary>
</histogram>

<histogram name="Security.PageInfo.Action.HttpUrl.Dangerous"
    enum="WebsiteSettingsAction" expires_after="M81">
  <obsolete>
    Expired after M81. No longer in use.
  </obsolete>
  <owner>estark@chromium.org</owner>
  <summary>
    Tracks Page Info bubble actions that take place on an HTTP URL that has been
    marked dangerous (such as for malware).
  </summary>
</histogram>

<histogram name="Security.PageInfo.Action.HttpUrl.Neutral"
    enum="WebsiteSettingsAction" expires_after="M81">
  <obsolete>
    Expired after M81. No longer in use.
  </obsolete>
  <owner>estark@chromium.org</owner>
  <summary>
    Tracks Page Info bubble actions that take place on an HTTP URL that does not
    have an omnibox security indicator warning associated with it.
  </summary>
</histogram>

<histogram name="Security.PageInfo.Action.HttpUrl.Warning"
    enum="WebsiteSettingsAction" expires_after="M81">
  <obsolete>
    Expired after M81. No longer in use.
  </obsolete>
  <owner>estark@chromium.org</owner>
  <summary>
    Tracks Page Info bubble actions that take place on an HTTP URL that has been
    given a &quot;Not secure&quot; warning in the omnibox.
  </summary>
</histogram>

<histogram name="Security.PageInfo.TimeOpen" units="units"
    expires_after="2022-07-11">
  <owner>cthomp@chromium.org</owner>
  <owner>security-enamel@chromium.org</owner>
  <summary>
    Records the amount of time the Page Info bubble is open before the user
    closes it or takes an action which closes it.
  </summary>
</histogram>

<histogram name="Security.PageInfo.TimeOpen.AboutThisSite{WasShown}" units="ms"
    expires_after="M101">
  <owner>olesiamarukhno@google.com</owner>
  <owner>dullweber@chromium.org</owner>
  <summary>
    Records the amount of time the Page Info bubble is open before the user
    closes it, for cases where the &quot;About this site&quot; feature is
    enabled and the data {WasShown} available, and therefore {WasShown} shown.
  </summary>
  <token key="WasShown">
    <variant name="NotShown" summary="is not"/>
    <variant name="Shown" summary="is"/>
  </token>
</histogram>

<histogram name="Security.PageInfo.TimeOpen.Action" units="units"
    expires_after="2022-06-12">
  <owner>cthomp@chromium.org</owner>
  <owner>security-enamel@chromium.org</owner>
  <summary>
    Records the amount of time the Page Info bubble is open before the user
    closes it, for cases where the user has performed an action inside it.
  </summary>
</histogram>

<histogram name="Security.PageInfo.TimeOpen.NoAction" units="units"
    expires_after="2022-06-12">
  <owner>cthomp@chromium.org</owner>
  <owner>security-enamel@chromium.org</owner>
  <summary>
    Records the amount of time the Page Info bubble is open before the user
    closes it, for cases where the user performed no action inside it.
  </summary>
</histogram>

<histogram name="Security.PasswordEntry.SiteEngagementLevel"
    enum="SiteEngagementLevel" expires_after="2021-10-31">
  <obsolete>
    Expired after 2021-10. No longer in use.
  </obsolete>
  <owner>meacer@chromium.org</owner>
  <owner>security-enamel@chromium.org</owner>
  <summary>
    Site engagement level of the URL of the top frame of the navigation when the
    user modifies a password field on the page. Only recorded once per
    navigation for the top frame.
  </summary>
</histogram>

<histogram name="Security.PasswordFocus.SiteEngagementLevel"
    enum="SiteEngagementLevel" expires_after="2021-01-31">
  <obsolete>
    Expired after 2021-01. No longer in use.
  </obsolete>
  <owner>meacer@chromium.org</owner>
  <owner>security-enamel@chromium.org</owner>
  <summary>
    Site engagement level of the URL of the top frame of the navigation when the
    user focuses on a password field on the page. Only recorded once per
    navigation for the top frame.
  </summary>
</histogram>

<histogram name="Security.PrivateNetworkAccess.CheckResult"
    enum="PrivateNetworkAccessCheckResult" expires_after="M107">
  <owner>titouan@chromium.org</owner>
  <owner>clamy@chromium.org</owner>
  <owner>mkwst@chromium.org</owner>
  <summary>
    Result of the Private Network Access Check on a new connection. Recorded
    once per call to network::URLLoader::OnConnected(), which may be more than
    once per URL request.
  </summary>
</histogram>

<histogram name="Security.SafetyTips.DownloadStarted" enum="SafetyTipStatus"
    expires_after="2022-04-24">
  <owner>jdeblasio@chromium.org</owner>
  <owner>estark@chromium.org</owner>
  <summary>
    Records the Safety Tip status on a page that initiated a download (*not* the
    Safety Tip status of the download URL itself). This is recorded regardless
    of whether the Safety Tip UI is enabled or disabled. This histogram is not
    recorded for downloads that are initiated in a new tab or window, as the
    Safety Tip status of the initiating page cannot be tracked.
  </summary>
</histogram>

<histogram name="Security.SafetyTips.FormSubmission" enum="SafetyTipStatus"
    expires_after="2022-04-24">
  <owner>jdeblasio@chromium.org</owner>
  <owner>estark@chromium.org</owner>
  <summary>
    Records the Safety Tip status of a page when submitting a form. This
    histogram is recorded whenever a form submission navigation begins. The
    recorded safety tip status is the status of the page the form was submitted
    from, not the one that the form targets. Recorded regardless of whether the
    Safety Tip UI is enabled or disabled.
  </summary>
</histogram>

<histogram name="Security.SafetyTips.Interaction" enum="SafetyTipInteraction"
    expires_after="2022-06-05">
  <owner>jdeblasio@chromium.org</owner>
  <owner>estark@chromium.org</owner>
  <summary>
    Records a user's interaction with a Safety Tip. Recorded every time a user
    uses one of the Safety Tip's buttons or dismisses it explicitly. Can be
    normalized against Security.SafetyTips.SafetyTipShown, filtered to users
    with the feature enabled to show the UI.
  </summary>
</histogram>

<histogram name="Security.SafetyTips.OpenTime.ChangePrimaryPage" units="ms"
    expires_after="2022-04-24">
  <owner>jdeblasio@chromium.org</owner>
  <owner>estark@chromium.org</owner>
  <summary>
    Records the amount of time a Safety Tip bubble is open, for cases where the
    document changes in the page the user sees.
  </summary>
</histogram>

<histogram name="Security.SafetyTips.OpenTime.CloseTab" units="ms"
    expires_after="2022-06-19">
  <owner>jdeblasio@chromium.org</owner>
  <owner>estark@chromium.org</owner>
  <summary>
    Records the amount of time a Safety Tip bubble is open, for cases where the
    user closed the tab.
  </summary>
</histogram>

<histogram name="Security.SafetyTips.OpenTime.Dismiss" units="ms"
    expires_after="2022-06-19">
  <owner>jdeblasio@chromium.org</owner>
  <owner>estark@chromium.org</owner>
  <summary>
    Records the amount of time a Safety Tip bubble is open, for cases where the
    user explicitly closed the bubble. This is recorded in addition to the more
    specifc metric that indicates how the user dismissed the Safety Tip.
  </summary>
</histogram>

<histogram name="Security.SafetyTips.OpenTime.DismissWithClose" units="ms"
    expires_after="2021-12-26">
  <owner>jdeblasio@chromium.org</owner>
  <owner>estark@chromium.org</owner>
  <summary>
    Records the amount of time a Safety Tip bubble is open, for cases where the
    user explicitly closed the bubble with the close button. This is recorded in
    addition to the base dismiss metric.
  </summary>
</histogram>

<histogram name="Security.SafetyTips.OpenTime.DismissWithEsc" units="ms"
    expires_after="2021-12-26">
  <owner>jdeblasio@chromium.org</owner>
  <owner>estark@chromium.org</owner>
  <summary>
    Records the amount of time a Safety Tip bubble is open, for cases where the
    user explicitly closed the bubble with the esc key. This is recorded in
    addition to the base dismiss metric.
  </summary>
</histogram>

<histogram name="Security.SafetyTips.OpenTime.DismissWithIgnore" units="ms"
    expires_after="2021-10-25">
  <owner>jdeblasio@chromium.org</owner>
  <owner>estark@chromium.org</owner>
  <summary>
    Records the amount of time a Safety Tip bubble is open, for cases where the
    user explicitly closed the bubble with the ignore button. This is recorded
    in addition to the base dismiss metric.
  </summary>
</histogram>

<histogram name="Security.SafetyTips.OpenTime.LeaveSite" units="ms"
    expires_after="2022-04-17">
  <owner>jdeblasio@chromium.org</owner>
  <owner>estark@chromium.org</owner>
  <summary>
    Records the amount of time a Safety Tip bubble is open, for cases where the
    user closed the bubble by heeding the call-to-action to leave the site.
  </summary>
</histogram>

<histogram name="Security.SafetyTips.OpenTime.NoAction" units="ms"
    expires_after="2021-10-25">
  <owner>jdeblasio@chromium.org</owner>
  <owner>estark@chromium.org</owner>
  <summary>
    Records the amount of time a Safety Tip bubble is open, for cases where the
    user did not dismiss or take action in the bubble.
  </summary>
</histogram>

<histogram name="Security.SafetyTips.OpenTime.StartNewNavigation" units="ms"
    expires_after="2021-10-15">
  <obsolete>
    Expired after 2021-10. It is deprecated in favor of
    Security.SafetyTips.OpenTime.ChangePrimaryPage. The safety tip is no longer
    listenening directly with navigation start as of http://crrev.com/c/3198098.
  </obsolete>
  <owner>jdeblasio@chromium.org</owner>
  <owner>estark@chromium.org</owner>
  <summary>
    Records the amount of time a Safety Tip bubble is open, for cases where the
    user started a new navigation in the same tab.
  </summary>
</histogram>

<histogram name="Security.SafetyTips.OpenTime.SwitchTab" units="ms"
    expires_after="2022-04-24">
  <owner>jdeblasio@chromium.org</owner>
  <owner>estark@chromium.org</owner>
  <summary>
    Records the amount of time a Safety Tip bubble is open, for cases where the
    user switched tabs.
  </summary>
</histogram>

<histogram name="Security.SafetyTips.PageInfo.Action"
    enum="WebsiteSettingsAction" expires_after="2021-10-25">
  <owner>jdeblasio@chromium.org</owner>
  <owner>src/chrome/browser/reputation/OWNERS</owner>
  <summary>
    Tracks Page Info bubble actions along with the Safety Tip status of the
    page.
  </summary>
</histogram>

<histogram base="true" name="Security.SafetyTips.ReputationCheckComplete"
    enum="SafetyTipStatus" expires_after="2022-05-01">
  <owner>jdeblasio@chromium.org</owner>
  <owner>src/chrome/browser/reputation/OWNERS</owner>
  <summary>
    Records the Safety Tip status of a page after navigation commit or page
    visibility change. This is the same as SafetyTipShown, but with additional
    suffixes for clarity.
  </summary>
</histogram>

<histogram name="Security.SafetyTips.SafetyTipIgnoredPageLoad"
    enum="SafetyTipStatus" expires_after="2021-12-26">
  <owner>jdeblasio@chromium.org</owner>
  <owner>src/chrome/browser/reputation/OWNERS</owner>
  <summary>
    Records the Safety Tip status of a page after navigation commit for a page
    where the Safety Tip has previously been ignored.
  </summary>
</histogram>

<histogram name="Security.SafetyTips.SafetyTipShown" enum="SafetyTipStatus"
    expires_after="2022-06-12">
  <owner>jdeblasio@chromium.org</owner>
  <owner>trusty-transport@chromium.org</owner>
  <summary>
    Records the Safety Tip status of a page after navigation commit or page
    visibility change.
  </summary>
</histogram>

<histogram name="Security.SafetyTips.SafetyTipShown_AfterFlag"
    enum="SafetyTipStatus" expires_after="2021-12-25">
  <owner>jdeblasio@chromium.org</owner>
  <owner>src/chrome/browser/reputation/OWNERS</owner>
  <summary>
    Records the Safety Tip status of a page after navigation commit or page
    visibility change. This is the same as SafetyTipShown, but records *after*
    the flag is checked to evaluate the impact of starts_active.
  </summary>
</histogram>

<histogram name="Security.SafetyTips.StatusWithInitiator.{SafetyTipInitiator}"
    enum="SafetyTipStatus" expires_after="2021-10-25">
  <owner>jdeblasio@chromium.org</owner>
  <owner>meacer@chromium.org</owner>
  <summary>
    Records the Safety Tip status of a page after navigation commit, alongside
    how the corresponding navigation was initiated. Only recorded on navigations
    that were visible at commit time.
  </summary>
  <token key="SafetyTipInitiator">
    <variant name="CrossOrigin" summary="Initiated by an unrelated origin"/>
    <variant name="SameOrigin" summary="Initiated by the same origin"/>
    <variant name="SameRegDomain"
        summary="Initiated by the same registered domain"/>
    <variant name="UnexpectedUrl" summary="Metrics failure"/>
    <variant name="Unknown" summary="Initiator unknown"/>
  </token>
</histogram>

<histogram name="Security.SCTAuditing.OptIn.CacheHWM" units="reports"
    expires_after="2021-10-10">
  <obsolete>
    Removed in April 2021 due to issues with collecting network service metrics
    at shutdown. Replaced by Security.SCTAuditing.OptIn.DedupeCacheHWM.
  </obsolete>
  <owner>cthomp@chromium.org</owner>
  <owner>security-enamel@chromium.org</owner>
  <summary>
    Records the high-water-mark of the number of reports in the SCT auditing
    cache size over each browser session. Recorded when the SCT auditing cache
    is destroyed (normally during browser shutdown, and potentially if the
    network service crashes).
  </summary>
</histogram>

<histogram name="Security.SCTAuditing.OptIn.DedupeCacheHWM" units="reports"
    expires_after="2022-09-01">
  <owner>cthomp@chromium.org</owner>
  <owner>trusty-transport@chromium.org</owner>
  <summary>
    Records the high-water-mark of the number of entries in the SCT auditing
    dedupe cache. Recorded on a timer hourly, if SCT auditing is enabled.
  </summary>
</histogram>

<histogram name="Security.SCTAuditing.OptIn.ReportCompletionStatus"
    enum="SCTAuditingReportCompletionStatus" expires_after="2022-09-01">
  <owner>cthomp@chromium.org</owner>
  <owner>trusty-transport@chromium.org</owner>
  <summary>
    Records the final status of an SCT auditing report, when it has been
    successfully received or it has run out of retries.
  </summary>
</histogram>

<histogram name="Security.SCTAuditing.OptIn.ReportDeduplicated" enum="Boolean"
    expires_after="2022-09-01">
  <owner>cthomp@chromium.org</owner>
  <owner>trusty-transport@chromium.org</owner>
  <summary>
    Records whether a report was deduplicated (i.e., the SCTs were already in
    the cache) or not. Recorded on each new report seen by the SCT auditing
    cache (i.e., on each connection using certificate transparency).
  </summary>
</histogram>

<histogram name="Security.SCTAuditing.OptIn.ReportersHWM" units="reporters"
    expires_after="2022-09-01">
  <owner>cthomp@chromium.org</owner>
  <owner>trusty-transport@chromium.org</owner>
  <summary>
    Records the high-water-mark of the number of pending reporters in the SCT
    auditing cache. Recorded on a timer hourly, if SCT auditing is enabled.
  </summary>
</histogram>

<histogram name="Security.SCTAuditing.OptIn.ReportSampled" enum="Boolean"
    expires_after="2022-09-01">
  <owner>cthomp@chromium.org</owner>
  <owner>trusty-transport@chromium.org</owner>
  <summary>
    Records whether a report was sampled to be sent to Safe Browsing. Recorded
    for each new report seen by the SCT auditing cache that was not
    deduplicated.
  </summary>
</histogram>

<histogram name="Security.SCTAuditing.OptIn.ReportSize" units="bytes"
    expires_after="2022-09-01">
  <owner>cthomp@chromium.org</owner>
  <owner>trusty-transport@chromium.org</owner>
  <summary>
    Records the size of an SCT auditing report that will be sent to Safe
    Browsing (i.e., was not deduplicated and was sampled).
  </summary>
</histogram>

<histogram name="Security.SCTAuditing.OptIn.ReportSucceeded" enum="Boolean"
    expires_after="2022-09-01">
  <owner>cthomp@chromium.org</owner>
  <owner>trusty-transport@chromium.org</owner>
  <summary>
    Records whether sending an SCT auditing report succeeded or not. This is
    recorded after we receive the headers from the server (or we stop due to a
    connection error).
  </summary>
</histogram>

<histogram name="Security.SecurityLevel.CryptographicScheme"
    enum="SecurityLevel" expires_after="2021-09-01">
  <obsolete>
    Expired after 2021-09. No longer in use. Code removed in M98.
  </obsolete>
  <owner>estark@chromium.org</owner>
  <owner>trusty-transport@chromium.org</owner>
  <summary>
    Records the security level of a page with a cryptographic scheme (e.g.
    https). This histogram is recorded once at navigation commit time, and can
    be called again for the same document if the security level changes
    dynamically. Note that the security level can change very quickly after
    commit time, for example if the page includes mixed content on load (which
    can downgrade the security level). This histogram should be analyzed with
    care because each recorded security level is not necessarily user-visible:
    in particular, a page may commit as a secure level (SECURE, EV_SECURE,
    SECURE_WITH_POLICY_INSTALLED_CERT) but get quickly downgraded to NONE if it
    shows mixed content on load. Therefore the histogram values should be
    regarded as an upper-bound on what the user actually sees for these security
    levels.
  </summary>
</histogram>

<histogram name="Security.SecurityLevel.DownloadStarted" enum="SecurityLevel"
    expires_after="2022-02-01">
  <owner>cthomp@chromium.org</owner>
  <owner>security-enamel@chromium.org</owner>
  <summary>
    Records the security level of the page that initiated a download (rather
    than the security state of the connection to the download URL itself). The
    recorded security level is the level of the page the download was initiated
    from, not that of the download URL. This histogram is not recorded for
    downloads that are initiated in a new tab or window, as the security level
    of the initiating page cannot be tracked.
  </summary>
</histogram>

<histogram name="Security.SecurityLevel.FormSubmission" enum="SecurityLevel"
    expires_after="2022-02-01">
  <owner>carlosil@chromium.org</owner>
  <owner>cthomp@chromium.org</owner>
  <summary>
    Records the security level of a page when submitting a form. This histogram
    is recorded whenever a form submission navigation begins. The recorded
    security level is the level of the page the form was submitted from, not the
    one that the form targets.
  </summary>
</histogram>

<histogram name="Security.SecurityLevel.InsecureMainFrameFormSubmission"
    enum="SecurityLevel" expires_after="2022-06-12">
  <owner>estark@chromium.org</owner>
  <owner>trusty-transport@chromium.org</owner>
  <summary>
    Records the security level of a page when submitting a form on a top-frame
    navigation with a non-cryptographic scheme. This histogram is recorded
    whenever a form submission navigation begins. The recorded security level is
    the level of the page the form was submitted from, not the one that the form
    targets.
  </summary>
</histogram>

<histogram name="Security.SecurityLevel.InsecureMainFrameNonFormNavigation"
    enum="SecurityLevel" expires_after="2021-09-01">
  <obsolete>
    Expired after 2021-09. No longer in use. Code removed in M98.
  </obsolete>
  <owner>estark@chromium.org</owner>
  <owner>trusty-transport@chromium.org</owner>
  <summary>
    Records the security level of a page on top-frame navigations with a
    non-cryptographic scheme that are not form submissions. This histogram is
    compared against Security.SecurityLevel.InsecureMainFrameFormSubmission.
  </summary>
</histogram>

<histogram name="Security.SecurityLevel.NoncryptographicScheme"
    enum="SecurityLevel" expires_after="2021-09-01">
  <obsolete>
    Expired after 2021-09. No longer in use. Code removed in M98.
  </obsolete>
  <owner>estark@chromium.org</owner>
  <owner>trusty-transport@chromium.org</owner>
  <summary>
    Records the security level of a page with a non-cryptographic scheme (e.g.
    http). This histogram is recorded once at navigation commit time, and can be
    called again for the same document if the security level changes
    dynamically. Note that the security level can change very quickly after
    commit time, for example if the page includes a password field on load
    (which can downgrade the security level). This histogram should be analyzed
    with care because each recorded security level is not necessarily
    user-visible: in particular, a page may commit as NONE or WARNING but get
    quickly downgraded to WARNING or DANGEROUS, depending on field trial
    configuration, if it shows a password field on load. Therefore the histogram
    values should be regarded as an upper-bound on what the user actually sees
    for the NONE and WARNING levels.
  </summary>
</histogram>

<histogram name="Security.SecurityLevel.OnCommit" enum="SecurityLevel"
    expires_after="2022-04-24">
  <owner>cthomp@chromium.org</owner>
  <owner>security-enamel@chromium.org</owner>
  <summary>
    Records the security level of a page at the time the navigation commits.
    Note that the security level of a page can change after commit time, so this
    histogram should often be compared against
    Security.SecurityLevel.OnComplete.
  </summary>
</histogram>

<histogram name="Security.SecurityLevel.OnComplete" enum="SecurityLevel"
    expires_after="2022-02-01">
  <owner>cthomp@chromium.org</owner>
  <owner>security-enamel@chromium.org</owner>
  <summary>
    Records the security level of a page at the end of the page visit (i.e.,
    navigating away from the page, reloading the page, clicking a link, closing
    the tab, etc.). Note that this security level can be different than the
    initial security level of the page, so this histogram should often be
    compared against Security.SecuritLevel.OnCommit.
  </summary>
</histogram>

<histogram base="true" name="Security.SiteEngagement" units="units"
    expires_after="2022-02-01">
  <owner>cthomp@chromium.org</owner>
  <owner>security-enamel@chromium.org</owner>
  <summary>
    The final Site Engagement score (0 to 100) of a URL during a visit to a
    page. Recorded when the user closes the page or initiates a new navigation.
  </summary>
</histogram>

<histogram base="true" name="Security.SiteEngagementDelta" units="units"
    expires_after="2021-10-10">
  <owner>cthomp@chromium.org</owner>
  <owner>security-enamel@chromium.org</owner>
  <summary>
    The change in Site Engagement score for a site between the page navigation
    committing and the user closing the page or navigating away. Recorded when
    the user closes the page or initiates a new navigation.

    The delta is logged as a linear count in [0, 100]. To use, convert back to
    the original difference (in the range [-100,100]) by multiplying by 2 and
    subtracting 100.
  </summary>
</histogram>

<histogram base="true" name="Security.TimeOnPage2" units="units"
    expires_after="2022-06-12">
  <owner>cthomp@chromium.org</owner>
  <owner>security-enamel@chromium.org</owner>
  <summary>
    Records the time spent on the page (the time that the page was in the
    foreground from the start of the navigation to the page visit completing due
    to a new navigation or the tab being closed). This aggregates all foreground
    time over the entire visit (multiple times in the foreground are added
    together).
  </summary>
</histogram>

<histogram name="Security.XFrameOptions" enum="XFrameOptions"
    expires_after="M85">
  <obsolete>
    Expired after M85. No longer in use.
  </obsolete>
  <owner>mkwst@chromium.org</owner>
  <owner>arthursonzogni@chromium.org</owner>
  <summary>
    Record uses of the X-Frame-Options header when a page is loaded as an
    iframe.
  </summary>
</histogram>

<histogram name="SiteIsolation.BrowsingInstance.MaxCountPerProcess"
    units="units" expires_after="2022-12-09">
  <owner>wjmaclean@chromium.org</owner>
  <owner>creis@chromium.org</owner>
  <summary>
    The maximum number of BrowsingInstances seen in a RenderProcessHost over its
    lifetime. Recorded once when
    ChildProcessImpl::SecurityState::~SecurityState() is invoked.
  </summary>
</histogram>

<histogram name="SiteIsolation.BrowsingInstanceCount" units="units"
    expires_after="2022-05-01">
  <owner>alexmos@chromium.org</owner>
  <owner>creis@chromium.org</owner>
  <summary>
    The count of all current BrowsingInstances. Recorded once per UMA ping.
  </summary>
</histogram>

<histogram base="true" name="SiteIsolation.CORBProtection.CacheHeuristic"
    enum="CrossOriginProtectionDecision" expires_after="M83">
  <owner>krstnmnlsn@chromium.org</owner>
  <owner>creis@chromium.org</owner>
  <summary>
    The blocking decision CORB would have made on the response, if the request
    was cross-origin. Reported if the response looked sensitive under the cache
    heuristic (i.e. had Cache-Control: Private and Vary: Origin response
    headers).
  </summary>
</histogram>

<histogram base="true"
    name="SiteIsolation.CORBProtection.CacheHeuristic.ProtectedMimeType"
    enum="BooleanSupported" expires_after="M83">
<!-- suffixed with Block*WithRangeSupport -->

  <owner>krstnmnlsn@chromium.org</owner>
  <owner>creis@chromium.org</owner>
  <summary>
    True if the response has an Accept-Ranges header, which indicates the server
    supports range requests on the resource and could be used to bypass CORB.
    Only reported if the resource looked sensitive under the Cache heuristic and
    was a protected MIME type.
  </summary>
</histogram>

<histogram base="true" name="SiteIsolation.CORBProtection.CORSHeuristic"
    enum="CrossOriginProtectionDecision" expires_after="M83">
  <owner>krstnmnlsn@chromium.org</owner>
  <owner>creis@chromium.org</owner>
  <summary>
    The blocking decision CORB would have made on the response, if the request
    was cross-origin. Reported if the response looked sensitive under the CORS
    heuristic (i.e. had the Access-Control-Allow-Origin header with a value
    other than * or null).
  </summary>
</histogram>

<histogram base="true"
    name="SiteIsolation.CORBProtection.CORSHeuristic.ProtectedMimeType"
    enum="BooleanSupported" expires_after="M83">
<!-- suffixed with Block*WithRangeSupport -->

  <owner>krstnmnlsn@chromium.org</owner>
  <owner>creis@chromium.org</owner>
  <summary>
    True if the response has an Accept-Ranges header, which indicates the server
    supports range requests on the resource and could be used to bypass CORB.
    Only reported if the resource looked sensitive under the CORS heuristic and
    was a protected MIME type.
  </summary>
</histogram>

<histogram base="true"
    name="SiteIsolation.CORBProtection.ProtectedMimeType.BlockedWithoutSniffing.HasNoSniff"
    enum="BooleanHasNoSniff" expires_after="M83">
  <owner>krstnmnlsn@chromium.org</owner>
  <owner>creis@chromium.org</owner>
  <summary>
    True if the response has a nosniff header. If the nosniff header is not
    present, then CORB must have decided to block without sniffing due to a
    partial response, or because the MIME type was a never sniff type. Only
    reported on resources CORB would have blocked/protected without sniffing
    that have a protected MIME type.
  </summary>
</histogram>

<histogram name="SiteIsolation.CORBProtection.SensitiveResource"
    enum="BooleanSensitive" expires_after="M83">
  <owner>krstnmnlsn@chromium.org</owner>
  <owner>creis@chromium.org</owner>
  <summary>
    True if the resource was found to be sensitive by either the CORS or Cache
    heuristics. Recorded for every resource CORB sees.
  </summary>
</histogram>

<histogram name="SiteIsolation.CORBProtection.SensitiveWithRangeSupport"
    enum="BooleanSupported" expires_after="M83">
  <owner>krstnmnlsn@chromium.org</owner>
  <owner>creis@chromium.org</owner>
  <summary>
    True if the response has an Accept-Ranges header, which indicates the server
    supports range requests on the resource. Only reported if the response
    looked sensitive under the cache or CORS heuristics.
  </summary>
</histogram>

<histogram
    name="SiteIsolation.FileSystemApi.CanAccessDataForOriginFailure.IsHttpBasedScheme"
    enum="BooleanHttpBasedOrOtherScheme" expires_after="2020-12-21">
  <obsolete>
    Removed in Dec 2020 / M89.
  </obsolete>
  <owner>lukasza@chromium.org</owner>
  <owner>nasko@chromium.org</owner>
  <summary>
    Logged when FileSystemManagerImpl::Open fails CanAccessDataForOrigin check.
    The value indicates whether the requested origin came from a http/https
    origin VS from another origin (possibly from a Chrome App).
  </summary>
</histogram>

<histogram name="SiteIsolation.IsPasswordFormSubmittedInDedicatedProcess"
    enum="SiteIsolationIsDedicatedProcess" expires_after="2022-06-05">
  <owner>alexmos@chromium.org</owner>
  <owner>lukasza@chromium.org</owner>
  <summary>
    Logs whether or not a password form was submitted from a site-isolated
    process that's dedicated to a single site. Recorded when a password form is
    submitted.
  </summary>
</histogram>

<histogram name="SiteIsolation.ORB.ResponseHeadersHeuristic.Decision"
    enum="OpaqueResponseBlocking_ResponseHeadersHeuristic" expires_after="M92">
  <owner>creis@chromium.org</owner>
  <owner>lukasza@chromium.org</owner>
  <summary>
    The approximation of a route that Opaque Response Blocking (ORB) algorithm
    would have taken to decide whether to block the response or not. The logged
    value is based on heuristics that only look at the HTTP response headers,
    and attempt to approximate if the full ORB algorithm would need to parse the
    response body as Javascript (vs also reaching a decision purely based on the
    HTTP response headers).

    Note that only partial ORB algorithm is used for logging the UMA (e.g. no
    multimedia sniffing and/or 206-response processing is done). This means that
    the results overestimate how many responses need Javascript parsing.

    Logged for each final HTTP/HTTPS response processed by the NetworkService.
  </summary>
</histogram>

<histogram name="SiteIsolation.ORB.ResponseHeadersHeuristic.{OrbDecision}"
    enum="RequestDestination" expires_after="M92">
  <owner>creis@chromium.org</owner>
  <owner>lukasza@chromium.org</owner>
  <summary>
    The request destination (e.g. script vs image) of a response that Opaque
    Response Blocking (ORB) algorithm processed {OrbDecision}.

    Note that only partial ORB algorithm is used for logging the UMA (e.g. no
    multimedia sniffing and/or 206-response processing is done). This means that
    the results overestimate how many responses need Javascript parsing.

    Logged for each final HTTP/HTTPS response processed by the NetworkService.
  </summary>
  <token key="OrbDecision">
    <variant name="ProcessedBasedOnHeaders"
        summary="based on HTTP response headers"/>
    <variant name="RequiresJavascriptParsing"
        summary="with required Javascript parsing"/>
  </token>
</histogram>

<histogram name="SiteIsolation.OutOfProcessIframes" units="oopifs"
    expires_after="2022-06-12">
  <owner>alexmos@chromium.org</owner>
  <owner>creis@chromium.org</owner>
  <owner>lukasza@chromium.org</owner>
  <owner>nasko@chromium.org</owner>
  <summary>
    The count of all out-of-process iframes. Recorded once per UMA ping.
  </summary>
</histogram>

<histogram name="SiteIsolation.OutOfProcessInnerFrameTrees" units="frame trees"
    expires_after="2022-04-10">
  <owner>alexmos@chromium.org</owner>
  <owner>creis@chromium.org</owner>
  <owner>lukasza@chromium.org</owner>
  <owner>nasko@chromium.org</owner>
  <summary>
    The count of all out-of-process inner frame trees. Recorded once per UMA
    ping.
  </summary>
</histogram>

<histogram name="SiteIsolation.ProxyCount" units="proxies"
    expires_after="2022-06-19">
  <owner>alexmos@chromium.org</owner>
  <owner>creis@chromium.org</owner>
  <owner>lukasza@chromium.org</owner>
  <summary>
    The count of all RenderFrameProxyHosts. Recorded once per UMA ping.
  </summary>
</histogram>

<histogram name="SiteIsolation.ProxyCountPerBrowsingInstance" units="units"
    expires_after="2022-08-18">
  <owner>alexmos@chromium.org</owner>
  <owner>creis@chromium.org</owner>
  <owner>lukasza@chromium.org</owner>
  <summary>
    The count of RenderFrameProxyHosts in each BrowsingInstance. Recorded each
    UMA ping, once per BrowsingInstance.
  </summary>
</histogram>

<histogram name="SiteIsolation.ReusePendingOrCommittedSite.CouldReuse"
    enum="ReusePendingOrCommittedSiteEnum" expires_after="M77">
  <owner>clamy@chromium.org</owner>
  <summary>
    Whether SiteInstances with a ProcessReusePolicy of
    REUSE_PENDING_OR_COMMITTED_SITE could reuse an existing RenderProcessHost or
    they had to create a new one. True when they reused an existing process,
    false when they created a new one.
  </summary>
</histogram>

<histogram
    name="SiteIsolation.ReusePendingOrCommittedSite.TimeSinceReusableProcessDestroyed"
    units="ms" expires_after="2022-06-12">
  <owner>jessemckenna@google.com</owner>
  <owner>olivierli@chromium.org</owner>
  <summary>
    Recorded on navigations with a ProcessReusePolicy of
    REUSE_PENDING_OR_COMMITTED_SITE (mostly subframe navigations). Measures the
    time since a RenderProcessHost hosting the destination URL was last
    destroyed, up to 10 seconds. If no host matching the destination was
    recently destroyed, a sentinel value of 20 seconds is used.
  </summary>
</histogram>

<histogram name="SiteIsolation.SavedOAuthSites.Size" units="origins"
    expires_after="2022-06-05">
  <owner>alexmos@chromium.org</owner>
  <owner>creis@chromium.org</owner>
  <owner>lukasza@chromium.org</owner>
  <summary>
    The number of currently saved sites that had been isolated due to OAuth.
    This is only used by Site Isolation on Android. Recorded once on browser
    startup.
  </summary>
</histogram>

<histogram name="SiteIsolation.SavedUserTriggeredIsolatedOrigins.Size"
    units="origins" expires_after="2022-06-05">
  <owner>alexmos@chromium.org</owner>
  <owner>creis@chromium.org</owner>
  <owner>lukasza@chromium.org</owner>
  <summary>
    The number of currently saved user-triggered isolated sites. This includes
    sites where the user has entered a password while using Site Isolation for
    password sites (which is a currently active site isolation mode on Android).
    Recorded once on browser startup.
  </summary>
</histogram>

<histogram name="SiteIsolation.SavedWebTriggeredIsolatedOrigins.Size"
    units="origins" expires_after="2022-06-05">
  <owner>alexmos@chromium.org</owner>
  <owner>creis@chromium.org</owner>
  <owner>lukasza@chromium.org</owner>
  <summary>
    The number of currently saved web-triggered isolated sites. This includes
    sites that were isolated due to Cross-Origin-Opener-Policy headers, which is
    a heuristic used for site isolation on Android. Recorded once on browser
    startup.
  </summary>
</histogram>

<histogram name="SiteIsolation.SiteInstancesPerBrowsingInstance" units="units"
    expires_after="2022-06-12">
  <owner>alexmos@chromium.org</owner>
  <owner>creis@chromium.org</owner>
  <owner>lukasza@chromium.org</owner>
  <owner>nasko@chromium.org</owner>
  <summary>
    The count of SiteInstances in a single BrowsingInstance. Recorded each UMA
    ping, once per BrowsingInstance.
  </summary>
</histogram>

<histogram name="SiteIsolation.XSD.Browser.Action"
    enum="SiteIsolationResponseAction" expires_after="2020-06-01">
  <owner>creis@chromium.org</owner>
  <owner>lukasza@chromium.org</owner>
  <summary>
    Various actions related to cross-site document blocking in the browser
    process, indicating whether the response was blocked from the renderer.
    Recorded as the response is processed in the network stack.
  </summary>
</histogram>

<histogram name="SiteIsolation.XSD.Browser.Blocked.CanonicalMimeType"
    enum="CorbCanonicalMimeType" expires_after="M81">
  <owner>creis@chromium.org</owner>
  <owner>lukasza@chromium.org</owner>
  <summary>
    The total count of responses that were blocked by the cross-site document
    blocking logic in the browser process. Recorded with a canonical MIME type
    when the response is blocked.
  </summary>
</histogram>

</histograms>

</histogram-configuration>