yangguo@google.com bmeurer@google.com Specified DevTools action has been taken. yangguo@google.com danilsomsikov@google.com 1633102 Measures the time until a full response from AIDA backend is received. wolfi@google.com alexrudenko@google.com 1559716 Availability of the built-in AI in DevTools. wolfi@google.com danilsomsikov@google.com yangguo@google.com 1559716 Records CDP command usage originating from {ClientType}. This is recorded whenever a CDP session receives and handles a command from a CDP client. nharshunova@google.com yulunz@google.com The number of changes made by the agent in one turn. nharshunova@google.com yulunz@google.com The number of changes shared with the AI agent in one turn. nharshunova@google.com yulunz@google.com The number of comments created in one turn. nharshunova@google.com yulunz@google.com The number of comments resolved by {Resolver} in one turn. nharshunova@google.com yulunz@google.com The number of comments shared with the AI agent in one turn. nharshunova@google.com yulunz@google.com The length of a comment in characters when created. bmeurer@google.com danilsomsikov@google.com Records for each developer resource load that the DevTools front-end issues (e.g. to load a source map) several enum values encoding which load method was used, whether a fallback was used (and why), and whether the method succeeded or not. Some explanations to make sense of the enum values: LoadsThroughPage = LoadThroughPageViaTarget + LoadThroughPageViaFrame SuccessfulLoadsThroughPage = LoadsThroughPage - LoadThroughPageFailure LoadThroughPageFallback is the number of loads that can in principle be loaded through the page, but had to use the fallback because either loading through the page failed (LoadThroughPageFailure), or there was insufficient information to dispatch the load through the page; the number of such loads can be computed as LoadThroughPageFallback - LoadThroughPageFailure. The number of loads not eligible for loading through the page can be computed as FallbackPerOverride + FallbackPerProtocol, where FallbackPerOverride indicates loads where the DevTools user disabled loading through the page via an override, and FallbackPerProtocol indicates loads where DevTools could not load the resource via the page due to the resource's protocol scheme. The total number of loads that used the fallback can be computed as LoadThroughPageFallback + FallbackPerOverride + FallbackPerProtocol. Adding SuccessfulLoadsThroughPage to that number gives the total number of loads. bmeurer@google.com danilsomsikov@google.com Records for each developer resource load that the DevTools front-end issues (e.g. to load a source map) one enum value that records the scheme of the resource's URL. For HTTP and HTTPS schemes, there are two enums each: One that signifies that the host was localhost, and one that signifies that it wasn't, i.e. to get the total number of resource loads using a HTTP scheme one must add the numbers of SchemeHttp and SchemeHttpLocalhost. The value SchemeUnknown signifies that parsing the scheme from the URL failed (note that at the point the enum is recorded, only absolute URLs arrive). dsv@chromium.org dgarber@microsoft.com 1456922 Records the resource type of a network request that the user selects to edit and resend. Fired at the start of resendFromConsole(), at the point that a fetch command is pasted into the console for user edit. yangguo@google.com changhaohan@google.com Fired when a devtools experiment is disabled from the experiments tab. yangguo@google.com changhaohan@google.com Fires for each experiment that is disabled at the time of Devtools Launch. yangguo@google.com changhaohan@google.com Fired when a devtools experiment is enabled from the experiments tab. yangguo@google.com changhaohan@google.com Fires for each experiment that is enabled at the time of Devtools Launch. danilsomsikov@google.com devtools-dev@chromium.org Tracks the target page type of chrome.devtools.inspectedWindow.eval calls. Used to measure cross-extension debugging frequency for crbug.com/375959766. ergunsh@google.com alexrudenko@google.com 1633102 The size (in bytes) of the code evaluation output returned by the FreestylerAgent. ergunsh@google.com alexrudenko@google.com 1633102 The length of the query (number of characters) given to the FreestylerAgent. dsv@chromium.org chrome-devtools@google.com Records whether the DevTools frontend being loaded is local (bundled/custom) or remote (served via CDN). Recorded once per DevTools session at session start. wolfi@google.com alexrudenko@google.com Measures the time it takes to generate a console insight teaser which is at least 301 characters long. wolfi@google.com alexrudenko@google.com Measures the time it takes to generate a console insight teaser which is shorter than 301 characters. wolfi@google.com alexrudenko@google.com Measures the time after which console insight teaser generation is aborted. Abortion is triggered after the first character of the teaser has already been generated. wolfi@google.com alexrudenko@google.com Measures the time after which console insight teaser generation is aborted. Abortion is triggered before the first character of the teaser has been generated. wolfi@google.com alexrudenko@google.com Measures the time from first character generated to full response for console insights teasers (maximum 3 minutes). wolfi@google.com alexrudenko@google.com Measures the time it takes to generate the first chunk of a console insight teaser (maximum 10 seconds). wolfi@google.com alexrudenko@google.com Measures the time it takes to generate the first chunk of a console insight teaser (maximum 3 minutes). wolfi@google.com alexrudenko@google.com Measures the time it takes to generate a console insight teaser (maximum 10 seconds). wolfi@google.com alexrudenko@google.com Measures the time it takes to generate a console insight teaser (maximum 3 minutes). yangguo@google.com bmeurer@google.com Time to load Developer Tools when user clicks Inspect Element in the context menu. bashi@google.com blink-network-stack@google.com Records whether a DevTools debugger is already paused in another outermost renderer. Recorded at the first pause of a DevTools debugger after the debugger is associated with a particular renderer channel. yangguo@google.com danilsomsikov@google.com 1519296 Records the issue type when an issue is created for the Issues Panel. bmeurer@google.com danilsomsikov@google.com 1519296 Records which type of issue is expanded in the issues panel. bmeurer@google.com danilsomsikov@google.com 1519296 Records which UI element is being used to open the Issues Panel. bmeurer@google.com danilsomsikov@google.com 1519296 Records which resource from what issue category is opened in the issue panel. bmeurer@google.com jalyn@microsoft.com leo.lee@microsoft.com Recorded when the user changes which keyboard shortcut presets they are using in the DevTools. bmeurer@google.com jalyn@microsoft.com leo.lee@microsoft.com Recorded when a DevTools keyboard shortcut has been processed and successfully executed its action. bmeurer@google.com szuend@google.com yangguo@google.com The actual display language used for the DevTools UI. Logged once per DevTools session when DevTools is booted up. yangguo@google.com bmeurer@google.com Measures the time until a given tool is interactive during a cold start of DevTools. {DevToolsLaunchPanels} asraine@google.com paulirish@google.com cjamcl@google.com Records which Lighthouse mode was used to audit the page. bmeurer@google.com szuend@google.com Records the media types of files opened in the DevTools Network panel response preview. changhaohan@google.com yangguo@google.com mathiasb@google.com Recorded when a particular action was taken to launch DevTools. yangguo@google.com bmeurer@google.com Specified DevTools panel was shown. alexrudenko@google.com mathiasb@google.com yangguo@google.com 1456922 Recorded when a replay is over. alexrudenko@google.com mathiasb@google.com yangguo@google.com 1456922 Recorded when a recording is being replayed. alexrudenko@google.com mathiasb@google.com yangguo@google.com 1456922 Recorded when a recording is started or finished in the Recorder panel. alexrudenko@google.com hablich@google.com Records user's choice on the remote debugging connection dialog. alexrudenko@google.com hablich@google.com Actions taken on the remote debugging server on chrome://inspect. dsv@chromium.org dgarber@microsoft.com 1456922 Records the resource type of a network request resent from DevTools. Fired at the start of resendRequest(), regardless of success or failure. bmeurer@google.com szuend@google.com 1456920 Records the media types of files debugged in the DevTools Sources panel. This means the user eiter sets a breakpoint, pauses or steps in a file of the recorded media type. bmeurer@google.com szuend@google.com 1456920 Records the media types of files opened in the DevTools Sources panel. pfaffe@google.com bmeurer@google.com Records the swatch usages in the Styles pane. szuend@google.com yangguo@google.com Records whether syncing DevTools settings via Chrome Sync is enabled or why it's disabled. Logged once per DevTools session when DevTools is booted up. paulirish@google.com jacktfranklin@google.com victorporof@google.com Measures the time a trace is loading. Starts when recording is stopped or file/url load was started. Stops after the first render of the flamechart. Warning: this histogram was expired from 2026-03-01 to M149 (2026-06-02); data may be missing. paulirish@google.com jacktfranklin@google.com victorporof@google.com Measures the time a trace is loading. Starts when recording is stopped or file/url load was started. Stops after the first render of the flamechart. Supports values over 10s. Warning: this histogram was expired from 2025-07-18 to M149 (2026-06-02); data may be missing. danilsomsikov@google.com hablich@google.com Clock time elapsed to process changes in DOM and log Visual Elements impressions. bmeurer@google.com hablich@google.com 1456920 Number of directories within a workspace folder traversed while loading the files from the folder. bmeurer@google.com hablich@google.com 1456920 Number of files loaded from a workspace folder (after the exclusion patterns are applied). bmeurer@google.com hablich@google.com 1456920 Wall clock time elapsed to initially populate a Workspaces folder. Recorded in the FileSystem#populate() method of FileSystemWorkspaceBinding.ts.