tools/metrics/histograms/metadata/chrome/histograms.xml - chromium/src - Git at Google

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

 <!--
 This file is used to generate a comprehensive list of Chrome 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
 go/reviewing-metrics (Googlers only), as all subdirectories are expected to
 have an OWNERS file. As a last resort you can send the CL to
 chromium-metrics-reviews@google.com.
 -->

 <histogram-configuration>

 <histograms>

 <histogram name="Chrome.BuildState.BuildStateUpdateType"
     enum="BuildStateUpdateType" expires_after="2024-03-30">
   <owner>ajgo@chromium.org</owner>
   <owner>anunoy@chromium.org</owner>
   <summary>
     Result of polling for the installed version of Chrome. Logged once at
     startup then approximately every two hours.
   </summary>
 </histogram>

 <histogram name="Chrome.Headless.Action" enum="HeadlessChromeAction"
     expires_after="2023-12-31">
   <owner>kvitekp@chromium.org</owner>
   <owner>headless-owners@chromium.org</owner>
   <summary>
     Records headless chrome action, e.g. remote debugging, screenshot, print to
     PDF, DOM dump. Reported once when the browser process is launched in
     headless mode. If more than one action is requested only one will be
     reported.
   </summary>
 </histogram>

 <histogram name="Chrome.KAnonymityService.JoinSet.Action"
     enum="KAnonymityServiceJoinSetAction" expires_after="2023-10-01">
   <owner>behamilton@google.com</owner>
   <owner>pauljensen@chromium.org</owner>
   <summary>
     Track execution of KAnonymity Service JoinSet requests for both normal
     operation and errors. The kJoinSet enumeration is emitted when the service
     is called and either kJoinSetSuccess or one of the error enumerations is
     emitted at the end of the request.
   </summary>
 </histogram>

 <histogram name="Chrome.KAnonymityService.JoinSet.Latency" units="ms"
     expires_after="2023-08-27">
   <owner>behamilton@google.com</owner>
   <owner>pauljensen@chromium.org</owner>
   <summary>
     Records the length of time the K-Anonymity service spends processing a
     JoinSet request. This includes time taking waiting in the JoinSet queue,
     getting a trust token (if necessary), performing the request, and waiting
     for the response. This metric is only measured for successful requests.
   </summary>
 </histogram>

 <histogram name="Chrome.KAnonymityService.QuerySet.Action"
     enum="KAnonymityServiceQuerySetAction" expires_after="2023-10-08">
   <owner>behamilton@google.com</owner>
   <owner>pauljensen@chromium.org</owner>
   <summary>
     Track execution of KAnonymity Service QuerySet requests for both normal
     operation and errors. The kQuerySet enumeration is emitted when the service
     is called and either kQuerySetsSuccess or one of the error enumerations is
     emitted at the end of the request.
   </summary>
 </histogram>

 <histogram name="Chrome.KAnonymityService.QuerySet.Latency" units="ms"
     expires_after="2023-08-27">
   <owner>behamilton@google.com</owner>
   <owner>pauljensen@chromium.org</owner>
   <summary>
     Records the length of time the K-Anonymity service spends processing a
     QuerySet request. This includes time taking waiting in the QuerySet queue,
     formatting the request, performing the request, waiting for the response,
     and parsing the response. This metric is only measured for successful
     requests.
   </summary>
 </histogram>

 <histogram name="Chrome.KAnonymityService.QuerySet.Size" units="count"
     expires_after="2023-10-08">
   <owner>behamilton@google.com</owner>
   <owner>pauljensen@chromium.org</owner>
   <summary>
     Records the number of elements queried per call for each call to QuerySet.
   </summary>
 </histogram>

 <histogram name="Chrome.KAnonymityService.TrustTokenGetter.Action"
     enum="KAnonymityTrustTokenGetterAction" expires_after="M115">
   <owner>behamilton@google.com</owner>
   <owner>pauljensen@chromium.org</owner>
   <summary>
     Track execution of KAnonymityTrustTokenGetter requests for both normal
     operation and errors. The kTryGetTrustTokenAndKey enumeration is emitted
     when the service is called and either kGetTrustTokenSuccess or one of the
     error enumerations is emitted at the end of the request.
   </summary>
 </histogram>

 <histogram name="Chrome.KAnonymityService.TrustTokenGetter.Latency" units="ms"
     expires_after="2023-10-08">
   <owner>behamilton@google.com</owner>
   <owner>pauljensen@chromium.org</owner>
   <summary>
     Records how the length of time the K-Anonymity service spends fetching trust
     tokens. This includes time taken waiting in the TrustTokenGetter queue,
     getting the OAuth token, getting the key commitment, and requesting the
     trust token. This metric is only measured for successful requests.
   </summary>
 </histogram>

 <histogram name="Chrome.Lacros.Smoothness.PercentDroppedFrames_1sWindow"
     units="%" expires_after="2023-07-25">
   <obsolete>
     This metric is reported on every dropped frame instead of every frame. It is
     deprecated in favor of
     Chrome.Lacros.Smoothness.PercentDroppedFrames_1sWindow2
   </obsolete>
   <owner>xiyuan@chromium.org</owner>
   <owner>chromeos-perfmetrics-eng@google.com</owner>
   <summary>
     Similar to Ash.Smoothness.PercentDroppedFrames_1sWindow but emitted for the
     browser UI of lacros-chrome.
   </summary>
 </histogram>

 <histogram name="Chrome.Lacros.Smoothness.PercentDroppedFrames_1sWindow2"
     units="%" expires_after="2024-01-29">
   <owner>xiyuan@chromium.org</owner>
   <owner>chromeos-perfmetrics-eng@google.com</owner>
   <summary>
     Similar to Ash.Smoothness.PercentDroppedFrames_1sWindow2 but emitted for the
     browser UI of lacros-chrome.
   </summary>
 </histogram>

 <histogram name="Chrome.ProcessSingleton.NotifyResult" enum="NotifyResult"
     expires_after="2023-10-01">
   <owner>gab@chromium.org</owner>
   <owner>etienneb@chromium.org</owner>
   <summary>
     The result of every rendez-vous reported once per browser process launch.
   </summary>
 </histogram>

 <histogram name="Chrome.ProcessSingleton.RemoteHungProcessTerminateReason"
     enum="RemoteHungProcessTerminateReason" expires_after="2023-07-30">
   <owner>gab@chromium.org</owner>
   <owner>etienneb@chromium.org</owner>
   <summary>The reason of remote hang processes termination.</summary>
 </histogram>

 <histogram name="Chrome.ProcessSingleton.RemoteProcessInteractionResult"
     enum="RemoteProcessInteractionResult" expires_after="2023-05-31">
   <owner>gab@chromium.org</owner>
   <owner>etienneb@chromium.org</owner>
   <summary>
     Used to send the result of interaction with remote process as histograms in
     case when remote process influences on start.
   </summary>
 </histogram>

 <histogram name="Chrome.ProcessSingleton.TerminateProcessErrorCode.Posix"
     enum="PopularOSErrno" expires_after="2023-05-31">
   <owner>gab@chromium.org</owner>
   <owner>etienneb@chromium.org</owner>
   <summary>
     The error code of remote process termination on Posix in case when remote
     process hung.
   </summary>
 </histogram>

 <histogram name="Chrome.ProcessSingleton.TerminateProcessErrorCode.Windows"
     enum="WinGetLastError" expires_after="2023-07-30">
   <owner>gab@chromium.org</owner>
   <owner>etienneb@chromium.org</owner>
   <summary>
     The error code of remote process termination on Windows in case when remote
     process hung.
   </summary>
 </histogram>

 <histogram name="Chrome.ProcessSingleton.TerminateProcessTime" units="ms"
     expires_after="2023-07-30">
   <owner>gab@chromium.org</owner>
   <owner>etienneb@chromium.org</owner>
   <summary>
     Time it takes from TerminateProcess call to the moment when we stop waiting
     for remote process switches to signal state.
   </summary>
 </histogram>

 <histogram name="Chrome.ProcessSingleton.TerminationWaitErrorCode.Windows"
     enum="WinGetLastError" expires_after="2023-07-30">
   <owner>gab@chromium.org</owner>
   <owner>etienneb@chromium.org</owner>
   <summary>
     The error code of wating for remote process termination on Windows.
   </summary>
 </histogram>

 <histogram name="Chrome.ProcessSingleton.TimeToCreate" units="ms"
     expires_after="2023-10-01">
   <owner>etienneb@chromium.org</owner>
   <owner>gab@chromium.org</owner>
   <summary>
     Time it takes to grab the process singleton. Reported once per successful
     attempt at obtaining the singleton.
   </summary>
 </histogram>

 <histogram name="Chrome.ProcessSingleton.TimeToFailure" units="ms"
     expires_after="2023-07-30">
   <owner>etienneb@chromium.org</owner>
   <owner>gab@chromium.org</owner>
   <summary>
     Time it takes to return an error from the process singleton algorithm (nor
     succeeding in obtaining it, nor in generating a rendez-vous). This does not
     include time spent in the fast notification path (chrome_exe_main_win.cc).
   </summary>
 </histogram>

 <histogram name="Chrome.ProcessSingleton.TimeToNotify" units="ms"
     expires_after="2023-07-30">
   <owner>etienneb@chromium.org</owner>
   <owner>gab@chromium.org</owner>
   <summary>
     Time it takes to find the process singleton owner and notify it. Reported
     once per successful rendez-vous. This does not include time spent in the
     fast notification path (chrome_exe_main_win.cc).
   </summary>
 </histogram>

 <histogram
     name="Chrome.SystemNetworkContextManager.NetworkSandboxLaunchFailed.ErrorCode"
     enum="LaunchErrorCodes" expires_after="2023-06-30">
   <owner>wfh@chromium.org</owner>
   <owner>mmenke@chromium.org</owner>
   <summary>
     The platform-specific error code returned from a failed attempt to launch
     the network service process sandboxed. This is recorded if an attempt is
     made to launch a sandboxed network service process, and the launch fails.
     See also ChildProcess.LaunchFailed.UtilityProcessErrorCode.
   </summary>
 </histogram>

 <histogram
     name="Chrome.SystemNetworkContextManager.NetworkSandboxLaunchFailed.WinLastError"
     enum="WinGetLastError" expires_after="2023-06-30">
   <owner>wfh@chromium.org</owner>
   <owner>mmenke@chromium.org</owner>
   <summary>
     The Windows last error obtained from a call to GetLastError after a failed
     attempt to launch the network service process sandboxed. This is recorded if
     an attempt is made to launch a sandboxed network service process on Windows,
     and the launch fails. See also ChildProcess.LaunchFailed.WinLastError.
   </summary>
 </histogram>

 <histogram name="Chrome.SystemNetworkContextManager.NetworkSandboxState"
     enum="NetworkSandboxState" expires_after="2023-09-10">
   <owner>wfh@chromium.org</owner>
   <owner>mmenke@chromium.org</owner>
   <summary>
     The operational state of the network sandbox. This is recorded each time the
     browser attempts to launch the network service process. This might be
     recorded multiple times from the same client if the network service process
     crashes or does not launch correctly. This is not recorded if the network
     service is running in-process.
   </summary>
 </histogram>

 <histogram name="Chrome.Tabs.AnimationSmoothness.HoverCard.FadeIn" units="%"
     expires_after="2023-06-04">
   <owner>yichenz@chromium.org</owner>
   <owner>chromeos-wmp@google.com</owner>
   <summary>
     Tracks the animation smoothness for the fade-in animation of tab hover card.
   </summary>
 </histogram>

 <histogram name="Chrome.Tabs.AnimationSmoothness.HoverCard.FadeOut" units="%"
     expires_after="2023-06-18">
   <owner>yichenz@chromium.org</owner>
   <owner>chromeos-wmp@google.com</owner>
   <summary>
     Tracks the animation smoothness for the fade-out animation of tab hover
     card.
   </summary>
 </histogram>

 <histogram name="Chrome.Tabs.AnimationSmoothness.TabLoading" units="%"
     expires_after="2024-01-12">
   <owner>yichenz@chromium.org</owner>
   <owner>chromeos-wmp@google.com</owner>
   <summary>
     Tracks the animation smoothness of tab loading animation. A tracker starts
     when the first tab loading animation starts and stops after the last one
     stops for each browser window. The metric is emitted when the tracker stops.
   </summary>
 </histogram>

 <histogram name="ChromeColors.ColorOnLoad" enum="ChromeColorsInfo"
     expires_after="2023-10-22">
   <owner>gayane@chromium.org</owner>
   <owner>yyushkina@chromium.org</owner>
   <summary>
     Records installed color id every time theme service is initialized from
     prefs. Happens once per profile load.
   </summary>
 </histogram>

 <histogram name="ChromeElf.ApplyHookResult" enum="NTSTATUS"
     expires_after="M121">
   <owner>pmonette@chromium.org</owner>
   <owner>kristianm@chromium.org</owner>
   <summary>
     Records the NTSTATUS result that was returned when attempting to hook
     NtMapViewOfSection during chrome_elf.dll initialization. Emitted
     asynchronously shortly after startup. This histogram was expired between M82
     and M114.
   </summary>
 </histogram>

 <histogram name="ChromeElf.Beacon.RetryAttemptsBeforeSuccess" units="units"
     expires_after="M121">
   <owner>pmonette@chromium.org</owner>
   <owner>kristianm@chromium.org</owner>
   <summary>
     Records the number of attempts needed before third-party DLL blocking was
     properly set up. This is logged immediately after a successful setup. Only
     recorded on Windows. This histogram was expired between M82 and M114.
   </summary>
 </histogram>

 <histogram name="ChromeElf.Beacon.SetupStatus" enum="BlacklistSetup"
     expires_after="M121">
   <owner>pmonette@chromium.org</owner>
   <owner>kristianm@chromium.org</owner>
   <summary>
     Records the successes and failures when running the third-party DLL blocking
     setup code, taking into account the safety beacon. Used to determine how
     often the third-party DLL blocking is disabled because it failed to
     initialize properly twice in a row. Only recorded on Windows. This histogram
     was expired between M82 and M114.
   </summary>
 </histogram>

 <histogram name="ChromeElf.ExtensionPoint.EnableState"
     enum="ExtensionPointEnableState" expires_after="M121">
   <owner>wfh@chromium.org</owner>
   <owner>ssmole@microsoft.com</owner>
   <summary>
     Records the outcome of the heuristic to selectively enable or disable the
     ProcessExtensionPointDisablePolicy. Used to determine how often the policy
     will be enabled in practice, as the heuristic detects the presence of third
     party software. Only recorded on Windows. This histogram was expired between
     M93 and M114.
   </summary>
 </histogram>

 <histogram name="ChromeElf.ThirdPartyStatus" enum="ThirdPartyStatus"
     expires_after="M121">
   <obsolete>
     Retained for historical data.
   </obsolete>
   <owner>pmonette@chromium.org</owner>
   <owner>kristianm@chromium.org</owner>
   <summary>
     Records the different status codes that are emitted by chrome_elf.dll while
     initializing the NtMapViewOfSection hook used to blocked third-party DLLs.
     Multiple status codes can be emitted per initialization since some of those
     status codes represent non-fatal failures. E.g. Failure to clear the
     previous failure codes. This also means that duplicates are possible. This
     is recorded shortly after Chrome launches, since chrome_elf.dll doesn't have
     access to the //base API. This histogram was expired between M82 and M114.
   </summary>
 </histogram>

 <histogram name="ChromeGeneratedCustomTab.IntentToFirstNavigationStartTime"
     units="ms" expires_after="M81">
   <owner>lizeb@chromium.org</owner>
   <summary>
     For Custom Tabs generated by Chrome itself instead of external apps, this
     shows the time between the intent arrival in the CCT and the first
     navigation start. Recorded when the page has finished loading.
   </summary>
 </histogram>

 <histogram name="ChromeGeneratedCustomTab.IntentToPageLoadedTime" units="ms"
     expires_after="M77">
   <owner>lizeb@chromium.org</owner>
   <summary>
     For Custom Tabs generated by Chrome itself instead of external apps, this
     shows time between the intent arrival in the CCT and the first &quot;page
     loaded&quot; event, if the navigation is successful.
   </summary>
 </histogram>

 </histograms>

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

	<!--
	This file is used to generate a comprehensive list of Chrome 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
	go/reviewing-metrics (Googlers only), as all subdirectories are expected to
	have an OWNERS file. As a last resort you can send the CL to
	chromium-metrics-reviews@google.com.
	-->

	<histogram-configuration>

	<histograms>

	<histogram name="Chrome.BuildState.BuildStateUpdateType"
	enum="BuildStateUpdateType" expires_after="2024-03-30">
	<owner>ajgo@chromium.org</owner>
	<owner>anunoy@chromium.org</owner>
	<summary>
	Result of polling for the installed version of Chrome. Logged once at
	startup then approximately every two hours.
	</summary>
	</histogram>

	<histogram name="Chrome.Headless.Action" enum="HeadlessChromeAction"
	expires_after="2023-12-31">
	<owner>kvitekp@chromium.org</owner>
	<owner>headless-owners@chromium.org</owner>
	<summary>
	Records headless chrome action, e.g. remote debugging, screenshot, print to
	PDF, DOM dump. Reported once when the browser process is launched in
	headless mode. If more than one action is requested only one will be
	reported.
	</summary>
	</histogram>

	<histogram name="Chrome.KAnonymityService.JoinSet.Action"
	enum="KAnonymityServiceJoinSetAction" expires_after="2023-10-01">
	<owner>behamilton@google.com</owner>
	<owner>pauljensen@chromium.org</owner>
	<summary>
	Track execution of KAnonymity Service JoinSet requests for both normal
	operation and errors. The kJoinSet enumeration is emitted when the service
	is called and either kJoinSetSuccess or one of the error enumerations is
	emitted at the end of the request.
	</summary>
	</histogram>

	<histogram name="Chrome.KAnonymityService.JoinSet.Latency" units="ms"
	expires_after="2023-08-27">
	<owner>behamilton@google.com</owner>
	<owner>pauljensen@chromium.org</owner>
	<summary>
	Records the length of time the K-Anonymity service spends processing a
	JoinSet request. This includes time taking waiting in the JoinSet queue,
	getting a trust token (if necessary), performing the request, and waiting
	for the response. This metric is only measured for successful requests.
	</summary>
	</histogram>

	<histogram name="Chrome.KAnonymityService.QuerySet.Action"
	enum="KAnonymityServiceQuerySetAction" expires_after="2023-10-08">
	<owner>behamilton@google.com</owner>
	<owner>pauljensen@chromium.org</owner>
	<summary>
	Track execution of KAnonymity Service QuerySet requests for both normal
	operation and errors. The kQuerySet enumeration is emitted when the service
	is called and either kQuerySetsSuccess or one of the error enumerations is
	emitted at the end of the request.
	</summary>
	</histogram>

	<histogram name="Chrome.KAnonymityService.QuerySet.Latency" units="ms"
	expires_after="2023-08-27">
	<owner>behamilton@google.com</owner>
	<owner>pauljensen@chromium.org</owner>
	<summary>
	Records the length of time the K-Anonymity service spends processing a
	QuerySet request. This includes time taking waiting in the QuerySet queue,
	formatting the request, performing the request, waiting for the response,
	and parsing the response. This metric is only measured for successful
	requests.
	</summary>
	</histogram>

	<histogram name="Chrome.KAnonymityService.QuerySet.Size" units="count"
	expires_after="2023-10-08">
	<owner>behamilton@google.com</owner>
	<owner>pauljensen@chromium.org</owner>
	<summary>
	Records the number of elements queried per call for each call to QuerySet.
	</summary>
	</histogram>

	<histogram name="Chrome.KAnonymityService.TrustTokenGetter.Action"
	enum="KAnonymityTrustTokenGetterAction" expires_after="M115">
	<owner>behamilton@google.com</owner>
	<owner>pauljensen@chromium.org</owner>
	<summary>
	Track execution of KAnonymityTrustTokenGetter requests for both normal
	operation and errors. The kTryGetTrustTokenAndKey enumeration is emitted
	when the service is called and either kGetTrustTokenSuccess or one of the
	error enumerations is emitted at the end of the request.
	</summary>
	</histogram>

	<histogram name="Chrome.KAnonymityService.TrustTokenGetter.Latency" units="ms"
	expires_after="2023-10-08">
	<owner>behamilton@google.com</owner>
	<owner>pauljensen@chromium.org</owner>
	<summary>
	Records how the length of time the K-Anonymity service spends fetching trust
	tokens. This includes time taken waiting in the TrustTokenGetter queue,
	getting the OAuth token, getting the key commitment, and requesting the
	trust token. This metric is only measured for successful requests.
	</summary>
	</histogram>

	<histogram name="Chrome.Lacros.Smoothness.PercentDroppedFrames_1sWindow"
	units="%" expires_after="2023-07-25">
	<obsolete>
	This metric is reported on every dropped frame instead of every frame. It is
	deprecated in favor of
	Chrome.Lacros.Smoothness.PercentDroppedFrames_1sWindow2
	</obsolete>
	<owner>xiyuan@chromium.org</owner>
	<owner>chromeos-perfmetrics-eng@google.com</owner>
	<summary>
	Similar to Ash.Smoothness.PercentDroppedFrames_1sWindow but emitted for the
	browser UI of lacros-chrome.
	</summary>
	</histogram>

	<histogram name="Chrome.Lacros.Smoothness.PercentDroppedFrames_1sWindow2"
	units="%" expires_after="2024-01-29">
	<owner>xiyuan@chromium.org</owner>
	<owner>chromeos-perfmetrics-eng@google.com</owner>
	<summary>
	Similar to Ash.Smoothness.PercentDroppedFrames_1sWindow2 but emitted for the
	browser UI of lacros-chrome.
	</summary>
	</histogram>

	<histogram name="Chrome.ProcessSingleton.NotifyResult" enum="NotifyResult"
	expires_after="2023-10-01">
	<owner>gab@chromium.org</owner>
	<owner>etienneb@chromium.org</owner>
	<summary>
	The result of every rendez-vous reported once per browser process launch.
	</summary>
	</histogram>

	<histogram name="Chrome.ProcessSingleton.RemoteHungProcessTerminateReason"
	enum="RemoteHungProcessTerminateReason" expires_after="2023-07-30">
	<owner>gab@chromium.org</owner>
	<owner>etienneb@chromium.org</owner>
	<summary>The reason of remote hang processes termination.</summary>
	</histogram>

	<histogram name="Chrome.ProcessSingleton.RemoteProcessInteractionResult"
	enum="RemoteProcessInteractionResult" expires_after="2023-05-31">
	<owner>gab@chromium.org</owner>
	<owner>etienneb@chromium.org</owner>
	<summary>
	Used to send the result of interaction with remote process as histograms in
	case when remote process influences on start.
	</summary>
	</histogram>

	<histogram name="Chrome.ProcessSingleton.TerminateProcessErrorCode.Posix"
	enum="PopularOSErrno" expires_after="2023-05-31">
	<owner>gab@chromium.org</owner>
	<owner>etienneb@chromium.org</owner>
	<summary>
	The error code of remote process termination on Posix in case when remote
	process hung.
	</summary>
	</histogram>

	<histogram name="Chrome.ProcessSingleton.TerminateProcessErrorCode.Windows"
	enum="WinGetLastError" expires_after="2023-07-30">
	<owner>gab@chromium.org</owner>
	<owner>etienneb@chromium.org</owner>
	<summary>
	The error code of remote process termination on Windows in case when remote
	process hung.
	</summary>
	</histogram>

	<histogram name="Chrome.ProcessSingleton.TerminateProcessTime" units="ms"
	expires_after="2023-07-30">
	<owner>gab@chromium.org</owner>
	<owner>etienneb@chromium.org</owner>
	<summary>
	Time it takes from TerminateProcess call to the moment when we stop waiting
	for remote process switches to signal state.
	</summary>
	</histogram>

	<histogram name="Chrome.ProcessSingleton.TerminationWaitErrorCode.Windows"
	enum="WinGetLastError" expires_after="2023-07-30">
	<owner>gab@chromium.org</owner>
	<owner>etienneb@chromium.org</owner>
	<summary>
	The error code of wating for remote process termination on Windows.
	</summary>
	</histogram>

	<histogram name="Chrome.ProcessSingleton.TimeToCreate" units="ms"
	expires_after="2023-10-01">
	<owner>etienneb@chromium.org</owner>
	<owner>gab@chromium.org</owner>
	<summary>
	Time it takes to grab the process singleton. Reported once per successful
	attempt at obtaining the singleton.
	</summary>
	</histogram>

	<histogram name="Chrome.ProcessSingleton.TimeToFailure" units="ms"
	expires_after="2023-07-30">
	<owner>etienneb@chromium.org</owner>
	<owner>gab@chromium.org</owner>
	<summary>
	Time it takes to return an error from the process singleton algorithm (nor
	succeeding in obtaining it, nor in generating a rendez-vous). This does not
	include time spent in the fast notification path (chrome_exe_main_win.cc).
	</summary>
	</histogram>

	<histogram name="Chrome.ProcessSingleton.TimeToNotify" units="ms"
	expires_after="2023-07-30">
	<owner>etienneb@chromium.org</owner>
	<owner>gab@chromium.org</owner>
	<summary>
	Time it takes to find the process singleton owner and notify it. Reported
	once per successful rendez-vous. This does not include time spent in the
	fast notification path (chrome_exe_main_win.cc).
	</summary>
	</histogram>

	<histogram
	name="Chrome.SystemNetworkContextManager.NetworkSandboxLaunchFailed.ErrorCode"
	enum="LaunchErrorCodes" expires_after="2023-06-30">
	<owner>wfh@chromium.org</owner>
	<owner>mmenke@chromium.org</owner>
	<summary>
	The platform-specific error code returned from a failed attempt to launch
	the network service process sandboxed. This is recorded if an attempt is
	made to launch a sandboxed network service process, and the launch fails.
	See also ChildProcess.LaunchFailed.UtilityProcessErrorCode.
	</summary>
	</histogram>

	<histogram
	name="Chrome.SystemNetworkContextManager.NetworkSandboxLaunchFailed.WinLastError"
	enum="WinGetLastError" expires_after="2023-06-30">
	<owner>wfh@chromium.org</owner>
	<owner>mmenke@chromium.org</owner>
	<summary>
	The Windows last error obtained from a call to GetLastError after a failed
	attempt to launch the network service process sandboxed. This is recorded if
	an attempt is made to launch a sandboxed network service process on Windows,
	and the launch fails. See also ChildProcess.LaunchFailed.WinLastError.
	</summary>
	</histogram>

	<histogram name="Chrome.SystemNetworkContextManager.NetworkSandboxState"
	enum="NetworkSandboxState" expires_after="2023-09-10">
	<owner>wfh@chromium.org</owner>
	<owner>mmenke@chromium.org</owner>
	<summary>
	The operational state of the network sandbox. This is recorded each time the
	browser attempts to launch the network service process. This might be
	recorded multiple times from the same client if the network service process
	crashes or does not launch correctly. This is not recorded if the network
	service is running in-process.
	</summary>
	</histogram>

	<histogram name="Chrome.Tabs.AnimationSmoothness.HoverCard.FadeIn" units="%"
	expires_after="2023-06-04">
	<owner>yichenz@chromium.org</owner>
	<owner>chromeos-wmp@google.com</owner>
	<summary>
	Tracks the animation smoothness for the fade-in animation of tab hover card.
	</summary>
	</histogram>

	<histogram name="Chrome.Tabs.AnimationSmoothness.HoverCard.FadeOut" units="%"
	expires_after="2023-06-18">
	<owner>yichenz@chromium.org</owner>
	<owner>chromeos-wmp@google.com</owner>
	<summary>
	Tracks the animation smoothness for the fade-out animation of tab hover
	card.
	</summary>
	</histogram>

	<histogram name="Chrome.Tabs.AnimationSmoothness.TabLoading" units="%"
	expires_after="2024-01-12">
	<owner>yichenz@chromium.org</owner>
	<owner>chromeos-wmp@google.com</owner>
	<summary>
	Tracks the animation smoothness of tab loading animation. A tracker starts
	when the first tab loading animation starts and stops after the last one
	stops for each browser window. The metric is emitted when the tracker stops.
	</summary>
	</histogram>

	<histogram name="ChromeColors.ColorOnLoad" enum="ChromeColorsInfo"
	expires_after="2023-10-22">
	<owner>gayane@chromium.org</owner>
	<owner>yyushkina@chromium.org</owner>
	<summary>
	Records installed color id every time theme service is initialized from
	prefs. Happens once per profile load.
	</summary>
	</histogram>

	<histogram name="ChromeElf.ApplyHookResult" enum="NTSTATUS"
	expires_after="M121">
	<owner>pmonette@chromium.org</owner>
	<owner>kristianm@chromium.org</owner>
	<summary>
	Records the NTSTATUS result that was returned when attempting to hook
	NtMapViewOfSection during chrome_elf.dll initialization. Emitted
	asynchronously shortly after startup. This histogram was expired between M82
	and M114.
	</summary>
	</histogram>

	<histogram name="ChromeElf.Beacon.RetryAttemptsBeforeSuccess" units="units"
	expires_after="M121">
	<owner>pmonette@chromium.org</owner>
	<owner>kristianm@chromium.org</owner>
	<summary>
	Records the number of attempts needed before third-party DLL blocking was
	properly set up. This is logged immediately after a successful setup. Only
	recorded on Windows. This histogram was expired between M82 and M114.
	</summary>
	</histogram>

	<histogram name="ChromeElf.Beacon.SetupStatus" enum="BlacklistSetup"
	expires_after="M121">
	<owner>pmonette@chromium.org</owner>
	<owner>kristianm@chromium.org</owner>
	<summary>
	Records the successes and failures when running the third-party DLL blocking
	setup code, taking into account the safety beacon. Used to determine how
	often the third-party DLL blocking is disabled because it failed to
	initialize properly twice in a row. Only recorded on Windows. This histogram
	was expired between M82 and M114.
	</summary>
	</histogram>

	<histogram name="ChromeElf.ExtensionPoint.EnableState"
	enum="ExtensionPointEnableState" expires_after="M121">
	<owner>wfh@chromium.org</owner>
	<owner>ssmole@microsoft.com</owner>
	<summary>
	Records the outcome of the heuristic to selectively enable or disable the
	ProcessExtensionPointDisablePolicy. Used to determine how often the policy
	will be enabled in practice, as the heuristic detects the presence of third
	party software. Only recorded on Windows. This histogram was expired between
	M93 and M114.
	</summary>
	</histogram>

	<histogram name="ChromeElf.ThirdPartyStatus" enum="ThirdPartyStatus"
	expires_after="M121">
	<obsolete>
	Retained for historical data.
	</obsolete>
	<owner>pmonette@chromium.org</owner>
	<owner>kristianm@chromium.org</owner>
	<summary>
	Records the different status codes that are emitted by chrome_elf.dll while
	initializing the NtMapViewOfSection hook used to blocked third-party DLLs.
	Multiple status codes can be emitted per initialization since some of those
	status codes represent non-fatal failures. E.g. Failure to clear the
	previous failure codes. This also means that duplicates are possible. This
	is recorded shortly after Chrome launches, since chrome_elf.dll doesn't have
	access to the //base API. This histogram was expired between M82 and M114.
	</summary>
	</histogram>

	<histogram name="ChromeGeneratedCustomTab.IntentToFirstNavigationStartTime"
	units="ms" expires_after="M81">
	<owner>lizeb@chromium.org</owner>
	<summary>
	For Custom Tabs generated by Chrome itself instead of external apps, this
	shows the time between the intent arrival in the CCT and the first
	navigation start. Recorded when the page has finished loading.
	</summary>
	</histogram>

	<histogram name="ChromeGeneratedCustomTab.IntentToPageLoadedTime" units="ms"
	expires_after="M77">
	<owner>lizeb@chromium.org</owner>
	<summary>
	For Custom Tabs generated by Chrome itself instead of external apps, this
	shows time between the intent arrival in the CCT and the first "page
	loaded" event, if the navigation is successful.
	</summary>
	</histogram>

	</histograms>

	</histogram-configuration>