robliao@chromium.org Records time from when Widget::Show() is called to when the first frame is presented for the App Menu. It's logged every time the app menu opens. ajgo@chromium.org anunoy@chromium.org Result of polling for the installed version of Chrome. Logged once at startup then approximately every two hours. ajgo@chromium.org ellyjones@chromium.org Emitted during every upload of UMA records for the current session when a single tab and a single window are blocking an update from applying. The chrome:// scheme value is not logged if a more specific value could be logged. Only recorded on Windows, Linux and Mac. ajgo@chromium.org ellyjones@chromium.org Records if an update is available, and the state of the client that is currently blocking an update from applying. Recorded on every upload of UMA data for the current session. Only recorded on Windows, Linux and Mac. ajgo@chromium.org ellyjones@chromium.org The time since an update has been available. Recorded on every upload of UMA data for the current session when an update is available. Only recorded on Windows, Linux and Mac. andresrperez@chromium.org anthonyvd@chromium.org drott@chromium.org etienneb@chromium.org The HResult of failed GetFont calls in DWriteFontProxyImpl::GetFontFileHandles. andresrperez@chromium.org anthonyvd@chromium.org drott@chromium.org etienneb@chromium.org The HResult of failed GetFontFamily calls in DWriteFontProxyImpl::GetFontFileHandles. andresrperez@chromium.org drott@chromium.org etienneb@chromium.org anthonyvd@chromium.org chrome-catan@google.com Records when an IPC is made to DwriteFontProxy. The bucket recorded is the IPC invoked. andresrperez@chromium.org drott@chromium.org etienneb@chromium.org The Windows last error obtained from a call to GetLastError after a failed attempt to obtain the file handle for a font. helmutjanuschka@chromium.org mych@chromium.org Recorded each time Chrome releases the FETCH_KEEPALIVE_REQUEST ScopedKeepAlive. True if no browser windows were open at that moment, i.e. this keep-alive was the only reason the process was still alive. Desktop only; only when kKeepAliveBrowserProcessAlive is enabled. See https://crbug.com/408010432. helmutjanuschka@chromium.org mych@chromium.org Wall-clock duration the FETCH_KEEPALIVE_REQUEST ScopedKeepAlive was held (in-flight fetch keepalive URLLoader count 0 -> >0 -> 0). Desktop only; only when kKeepAliveBrowserProcessAlive is enabled. See https://crbug.com/408010432. helmutjanuschka@chromium.org mych@chromium.org Peak number of fetch keepalive URLLoaders in flight during a single hold of the FETCH_KEEPALIVE_REQUEST ScopedKeepAlive. Desktop only; only when kKeepAliveBrowserProcessAlive is enabled. See https://crbug.com/408010432. andresrperez@chromium.org drott@chromium.org etienneb@chromium.org anthonyvd@chromium.org chrome-catan@google.com Records the amount of currently mapped font files in a renderer's Font Data Manager. This is recorded whenever a new mapped file is added to the cache. andresrperez@chromium.org drott@chromium.org etienneb@chromium.org anthonyvd@chromium.org chrome-catan@google.com Records the result of creating the typeface result object in the browser process following a request for matching font name from a renderer process. andresrperez@chromium.org drott@chromium.org etienneb@chromium.org Records whether the font path is empty when attempting to obtain the file handle for a font. andresrperez@chromium.org drott@chromium.org etienneb@chromium.org anthonyvd@chromium.org chrome-catan@google.com Records whether the font path references a parent (contains "..") when trying to get a file handle to a font in FontDataService. This would prevent the creation of the base::File from succeeding. andresrperez@chromium.org drott@chromium.org etienneb@chromium.org anthonyvd@chromium.org chrome-catan@google.com Records when an IPC is made to FontDataService. The bucket recorded is the IPC invoked. andresrperez@chromium.org drott@chromium.org dileepmaurya@microsoft.com Records whether the local font matching found a matching font during a MatchLocalFont call. True means a font was found by PostScript name or full font name, false means no match was found in the system font set. andresrperez@chromium.org gab@chromium.org etienneb@chromium.org Records the size of the assets cache used when using a shared memory region. If the cache is over the size limit, a dump without crashing is triggered. andresrperez@chromium.org drott@chromium.org etienneb@chromium.org The Windows last error obtained from a call to GetLastError after a failed attempt to obtain the file handle for a font. kvitekp@google.com headless-owners@chromium.org 1456776 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. This histogram expired in December 2023 and was revived in M142. etienneb@chromium.org grt@chromium.org Records the Windows last error code (GetLastError) when lock file creation fails for a reason other than a sharing violation. Recorded once per fatal failure on Windows. etienneb@chromium.org grt@chromium.org Records whether creating the lock file eventually succeeded. Recorded once per attempt to create the lock file with a timeout on Windows. etienneb@chromium.org grt@chromium.org Records the number of retries it took to successfully acquire the lock file. Recorded once per successful lock file creation on Windows. A value of 0 indicates that the lock file was successfully acquired on the first attempt with no retries. gab@chromium.org etienneb@chromium.org The result of every rendez-vous reported once per browser process launch. gab@chromium.org etienneb@chromium.org The reason of remote hang processes termination. gab@chromium.org etienneb@chromium.org Used to send the result of interaction with remote process as histograms in case when remote process influences on start. gab@chromium.org etienneb@chromium.org The error code of remote process termination on Posix in case when remote process hung. gab@chromium.org etienneb@chromium.org Time it takes from TerminateProcess call to the moment when we stop waiting for remote process switches to signal state. gab@chromium.org etienneb@chromium.org The error code of waiting for remote process termination on Windows. etienneb@chromium.org gab@chromium.org Time it takes to grab the process singleton. Reported once per successful attempt at obtaining the singleton. etienneb@chromium.org gab@chromium.org 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). wfh@chromium.org mmenke@chromium.org Reported if the network service process crashed early in startup, before IPC and mojo services are available. wfh@chromium.org mmenke@chromium.org 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. wfh@chromium.org mmenke@chromium.org 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. wfh@chromium.org mmenke@chromium.org 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. yichenz@chromium.org chromeos-wmp@google.com 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. tiborg@chromium.org chrome-desktop-ntp@google.com Records installed color id every time theme service is initialized from prefs. Happens once per profile load if the user has a GM2 color installed. This histogram records only GM2 colors. For tracking the installed GM3 color see the ChromeColors.DynamicColorOnLoad histogram. Or see the ChromeColors.ColorType histogram for the type of installed Chrome color. dpenning@chromium.org top-chrome-desktop-ui@google.com Recorded every time the theme service is initialized from prefs (happens once per profile load). Records the browser color scheme mode (Light, Dark, System). tiborg@chromium.org chrome-desktop-ntp@google.com Records installed color type every time theme service is initialized from prefs. Happens once per profile load if the user has a Chrome color installed. To track, which color is installed see the ChromeColors.ColorOnLoad histogram for GM2 colors and the ChromeColors.DynamicColorOnLoad histogram for GM3 colors. tiborg@chromium.org chrome-desktop-ntp@google.com Records installed color id every time theme service is initialized from prefs. Happens once per profile load if the user has a GM3 color installed. This histogram records only GM3 colors. For tracking the installed GM2 color see the ChromeColors.ColorOnLoad histogram. Or see the ChromeColors.ColorType histogram for the type of installed Chrome color. pmonette@chromium.org kristianm@chromium.org 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. pmonette@chromium.org kristianm@chromium.org 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. pmonette@chromium.org kristianm@chromium.org 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. wfh@chromium.org ssmole@microsoft.com 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.