twellington@chromium.org finkm@chromium.org Actions taken from the new tab page on Android. These actions may navigate away from the NTP (e.g. searching in the omnibox or opening a bookmark), but can also happen without navigating away from the NTP (e.g. opening a content suggestion in a new tab). shomizoe@google.com chrome-desktop-ntp@google.com Logged on the Desktop New Tab Page load. Records true if any Action Chips are shown, and false otherwise. In particular, this is incremented in the following way: - when the user is not eligible for action chips or has disabled them, this is incremented with false. - when the user is eligible for action chips, this is incremented if more than 0 action chips are shown. giannich@chromium.org chrome-desktop-ntp@google.com Logged when any Action Chips was clicked by the user. giannich@chromium.org chrome-desktop-ntp@google.com The time it took for the handler to generate the Action Chips in milliseconds. This measurement is taken whenever there is a call to build and return the Action Chips, whether due to loading the NTP for the first time or due to subsequent user browsing and navigation. shomizoe@google.com chrome-desktop-ntp@google.com The high-level status of the request to the action chips suggestions service. Logged every time a request is made. This feature is currently available only in 1P NTP. A request is sent when the follownig occurs:. - NTP is visited/refreshed. - An action chip/row is dismissed. This causes all the chips to be reloaded. shomizoe@google.com chrome-desktop-ntp@google.com The network error code encountered when making a request to the action chips suggestions service. Logged when the request status is kNetworkError or kHttpError. shomizoe@google.com chrome-desktop-ntp@google.com The detailed parse failure reason when processing the response from the action chips suggestions service. Logged when the request status is kParseError. giannich@chromium.org chrome-desktop-ntp@google.com Logged when any Action Chips was shown to the user. shomizoe@google.com chrome-desktop-ntp@google.com The number of action chips returned by the suggestions service. Logged when a request successfully returns suggestions. This feature (action chips) is currently available only in 1P NTP. A request is sent when the follownig occurs: - NTP is visited/refreshed. - An action chip/row is dismissed. This causes all the chips to be reloaded. rtatum@google.com tiborg@chromium.org chrome-desktop-ntp@google.com Logged when New Tab Page Action Chips visibility is toggled via Customize Chrome. This toggle is only available in the Customize Chrome Side Panel when the user is currently viewing a 1P NTP, is signed in, and is eligible for AIM features. giannich@chromium.org chrome-desktop-ntp@google.com The time it took for the Action Chips to initially load on the WebUI in milliseconds, from the start of the NTP load until they are fully rendered. This measurement is only taken during the first time the Action Chips are rendered on the NTP; any subsequent updates to the Action Chips on the same NTP due to user navigation are not measured. justincohen@chromium.org gambard@chromium.org Actions taken by users from the new tab page on iOS. These actions may navigate away from the NTP (e.g. searching in the omnibox or opening a bookmark), but can also happen without navigating away from the NTP (e.g. opening a bookmark in a new tab). hanxi@chromium.org xinyiji@chromium.org Records total impressions of a NTP showing as the home surface, including at startup when users haven't used Chrome for 8 hours and via back operations. Only records true if shows. This histogram is recorded on tablets only. hanxi@chromium.org xinyiji@chromium.org Records impressions of a NTP is showing as the home surface at a cold or warm startup when users haven't used Chrome for 8 hours, and only records true if shows. This histogram is recorded on tablets only. pauladedeji@google.com danpeng@google.com chrome-desktop-ntp@google.com Records the type of background image that is set. Only recorded once per NTP. pauladedeji@google.com tiborg@chromium.org chrome-desktop-ntp@google.com The time it took until a request from the New Tab Page for Backdrop Collections was served. {NewTabPage_BackgroundService_RequestLatency} pauladedeji@google.com danpeng@google.com chrome-desktop-ntp@google.com Records image's type when an error is detected via its URL headers. Logged every time Chrome encounters an error when verifying background images. pauladedeji@google.com danpeng@google.com chrome-desktop-ntp@google.com The time it takes to download an image's URL headers. Logged every time Chrome encounters an error when verifying background images. pauladedeji@google.com danpeng@google.com chrome-desktop-ntp@google.com Records the HTTP response status code of New Tab Page image URL header requests. Logged every time Chrome encounters an error when verifying background images. pauladedeji@google.com tiborg@chromium.org chrome-desktop-ntp@google.com The time it took until a request from the New Tab Page for Backdrop Images was served. {NewTabPage_BackgroundService_RequestLatency} pauladedeji@google.com danpeng@google.com chrome-desktop-ntp@google.com Logs where a user opened the Chrome Web Store link from in Customize Chrome. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Logged when the NTP was clicked. Only logged on the 1P NTP. Be aware that this may undercount clicks on nested OGB iframes. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. pauladedeji@google.com danpeng@google.com chrome-desktop-ntp@google.com The collection id of user's background image on the NTP. Only recorded once per NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. niharm@google.com rtatum@google.com chrome-desktop-ntp@google.com Histogram of the time, in milliseconds since navigation start, it took a Compose Plate session to start. Recorded when the user clicks on the compose entrypoint on desktop. This only gets recorded if the compose button leads to a compose session starting (i.e. the composebox opening). niharm@google.com ananyaseelam@google.com chrome-desktop-ntp@google.com Recorded when the user clicks on the compose entrypoint in the desktop NTP realbox. Records whether the user had text in the realbox at the time they clicked the compose entrypoint. This metric is only recorded when the entry point is used to navigate rather than open the compose box. niharm@google.com ananyaseelam@google.com chrome-desktop-ntp@google.com Recorded when the compose entrypoint is shown in the desktop NTP realbox. This is recorded once when the NTP is attached to DOM. It is not shown for enterprise if the enterprise policies don't allow AIMode settings. hanxi@chromium.org xinyiji@chromium.org Record whether the composeplate row is displayed on the New Tab Page. The histogram is logged on New tab page and is Android-only. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Records the concrete page loaded when navigating to chrome://newtab. Recorded on every NTP load. freedjm@chromium.org feed@chromium.org Android: Whether article suggestions on New Tab Page are set visible by user on startup and when the visibility is changed. freedjm@chromium.org feed@chromium.org Android / iOS (M128+): The position of the For-You card on the NTP, that is clicked through to the host website of the content. We track the position the card had in the list when it was first seen by the user. This tracked position can be different from the position observed by the user, e.g. when the user dismissed some suggestions from the list or requested more that got inserted in the middle of the feed. iOS (Pre M128): Reported per click on card in the feed. Does not include position information and thus can only be used as a total count of clicks. {ContentSuggestionCategory} freedjm@chromium.org feed@chromium.org Android: The position of a For-You card that was shown on the NTP. A card is considered shown when at least 2/3 of its height is visible on the screen. For each card, at most one impression is recorded per NTP instance. We track the position the card had in the list when it was first seen by the user. This tracked position can be different from the position observed by the user, e.g. when the user dismissed some suggestions from the list or requested more that got inserted in the middle of the feed. {ContentSuggestionCategory} kawasin@google.com clank-performance-team@google.com Count the simultaneous New Tab Page. This is recorded when a new tab page is created. The count contains the created page. jhimawan@google.com clank-app-team@google.com clank-start@google.com Android: Records when the all cards switch is toggled on or off. The histogram is logged each time a user clicks the toggle switch in the NTP customization bottom sheet. Each press of the toggle switch is counted as a separate count. hanxi@chromium.org yanlinghu@google.com clank-start@google.com Android: Records the type of bottom sheet each time the customization bottom sheet is shown. The histogram is logged when the user opens a NTP customization bottom sheet, regardless of whether the bottom sheet has been opened before. hanxi@chromium.org yanlinghu@google.com clank-start@google.com Android: Records when the Most Visited Tiles section on the New Tab Page is toggled to be visible or invisible. The histogram is logged each time a user clicks the toggle switch in the my shortcuts bottom sheet. Each press of the toggle switch is counted as a separate count. hanxi@chromium.org xinyiji@chromium.org yanlinghu@google.com clank-start@google.com Android: Records the number of times the initial NTP customization bottom sheet is opened by the user, categorized by the specific source of the opening action. This initial bottom sheet is the entry point to the NTP customization flow. The histogram is logged in response to user clicking on the main menu or on the toolbar to open the initial NTP customization bottom sheet. hanxi@chromium.org yyanting@google.com clank-start@google.com Records the last color ID of the Chrome theme colors that was selected by the user from the Chrome Colors bottom sheet. This metric is logged when the bottom sheet is closed. This metric is logged on Android only. hanxi@chromium.org yyanting@google.com clank-start@google.com Records whether the user toggles on or off daily refresh for Chrome Colors. This metric is logged when the Chrome Colors bottom sheet is closed. This metric is logged on Android only. hanxi@chromium.org yyanting@google.com clank-start@google.com Records the total number of selections of the theme inside collection sub category. This is logged only for the first selection within a specific theme collection's view. Navigating to a different collection and making a selection will trigger a new record, but multiple selections within the same collection view will not. This metric is logged on Android only. hanxi@chromium.org yyanting@google.com clank-start@google.com Records the total number of impressions of the theme collection sub categories shown in the New Tab Page customization. This histogram is logged every time when the theme collection sub category is shown, regardless of whether it has been shown before. This metric is logged on Android only. hanxi@chromium.org yyanting@google.com clank-start@google.com Records the number of times daily refresh is toggled off for a set of theme collection categories. This metric is logged when the single theme collection bottom sheet is closed. This metric is logged on Android only. hanxi@chromium.org yyanting@google.com clank-start@google.com Records the number of times daily refresh is toggled on for a set of theme collection categories. This metric is logged when the single theme collection bottom sheet is closed. This metric is logged on Android only. hanxi@chromium.org yyanting@google.com clank-start@google.com Records the type of theme selected for the New Tab Page background. This is logged once per cold startup. This metric is logged on Android only. hanxi@chromium.org yyanting@google.com clank-start@google.com Records the type of user interactions with the theme upload image preview dialog. The histogram is logged every time when the user interacts with the theme upload image preview dialog. This metric is logged on Android only. hanxi@chromium.org yyanting@google.com clank-start@google.com Records the total number of impressions of the theme upload image preview dialog. The histogram is logged every time when the theme upload image preview dialog is shown, regardless of whether the preview dialog has been shown before. This metric is logged on Android only. yanlinghu@google.com hanxi@chromium.org clank-start@google.com Records the user click action (Customize or Cancel) in the NTP theme tip bottom sheet. Logged when either button is clicked. This metric is logged on Android only. hanxi@chromium.org yanlinghu@google.com clank-start@google.com Records the visibility state of the Most Visited Tiles section on the New Tab Page. The histogram is logged when Chrome is launched in cold startup. This metric is logged on Android only. hanxi@chromium.org yanlinghu@google.com clank-start@google.com Android: Records when a module is activated or deactivated in the NTP Cards bottom sheet. The histogram is logged in response to a user clicking on the toggle switch on the NTP Cards bottom sheet. Each press of the toggle switch is counted as a separate count. pauladedeji@google.com tiborg@chromium.org chrome-desktop-ntp@google.com Captures the actions performed when configuring a 'Chrome background' image on the New Tab Page. Since most actions are sequential, this may indicate steps in the configuration process where users drop off. pauladedeji@google.com danpeng@google.com chrome-desktop-ntp@google.com Captures calls to open Customize Chrome on the NTP. Calls can be made to open Customize Chrome while it is already open. Opening Customize Chrome from inside the side panel is tracked by "SidePanel.CustomizeChrome.ShowTriggered". kbajkiewicz@google.com rsult@google.com chrome-signin-desktop-team@google.com Captures the eligibility for Customize Chrome Promo. Recorded every time the 1P NTP opens. pauladedeji@google.com tiborg@chromium.org rtatum@google.com chrome-desktop-ntp@google.com Captures the actions performed for customizing Chrome within the Customize Chrome Side Panel on the New Tab Page. Since most actions are sequential, this may indicate steps in the configuration process where users drop off. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com The New Tab Page features that have been customized by the user; logged per NTP load. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com The New Tab Page shortcut settings that can be customized by the user, including shortcut type (i.e. most visited vs custom links) and visibility; logged per NTP load. pauladedeji@google.com tiborg@chromium.org chrome-desktop-ntp@google.com Captures the actions performed when uploading a local image as the background on the New Tab Page. Since most actions are sequential, this may indicate steps in the configuration process where users drop off. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Captures the actions performed when configuring shortcuts on the New Tab Page. rtatum@google.com tiborg@chromium.org chrome-desktop-ntp@google.com Logged when a user clicks on a file within the Drive Module. The index is equal to the index of the file. rtatum@google.com tiborg@chromium.org chrome-desktop-ntp@google.com Logs the number of files returned by ItemSuggest. Logged every time the Drive module successfully processed an ItemSuggest response. rtatum@google.com tiborg@chromium.org chrome-desktop-ntp@google.com Logs the result of a request to the ItemSuggest API. Logged every time the Drive module makes an ItemSuggest request. hanxi@chromium.org xinyiji@chromium.org Records the reason of why failed to show a home surface UI on the chosen NTP. Logged in cold or warm startup when failed to show the home surface UI. This histogram is recorded on tablets only. hanxi@chromium.org xinyiji@chromium.org Record the total number of impressions of the fake search box composeplate view on the New Tab Page. The histogram is logged on New tab page and is Android-only. hanxi@chromium.org xinyiji@chromium.org Record the total number of impressions of the fake search box on the New Tab Page. This logs a baseline impression count for the button in the fake search box. The event is triggered each time the New Tab Page is shown or the button's visibility is updated.The histogram is Android-only. tiborg@chromium.org chrome-desktop-ntp@google.com Logged when the Footer was clicked. tiborg@chromium.org chrome-desktop-ntp@google.com Logged when item in footer's context menu is clicked. tiborg@chromium.org chrome-desktop-ntp@google.com Captures calls to open Customize Chrome on the Footer. Calls can be made to open Customize Chrome while it is already open. Opening Customize Chrome from inside the side panel is tracked by "SidePanel.CustomizeChrome.ShowTriggered". pauladedeji@google.com tiborg@chromium.org esalma@google.com chrome-desktop-ntp@google.com Logs type of footer notice shown in New Tab Footer when a new tab page is opened. pauladedeji@google.com tiborg@chromium.org chrome-desktop-ntp@google.com Histogram of the time, in milliseconds, between when the New Tab Footer was triggered to be shown and when it was shown. pauladedeji@google.com tiborg@chromium.org chrome-desktop-ntp@google.com Logged when New Tab Footer visibility is toggled via Customize Chrome. pauladedeji@google.com tiborg@chromium.org chrome-desktop-ntp@google.com Whether New Tab Footer is visible when a new tab page is opened. pauladedeji@google.com tiborg@chromium.org chrome-desktop-ntp@google.com The amount of time between the RenderFrameHost StartProvisionalLoad event and the RenderFrameHost DocumentOnLoadCompleted event for the New Tab Footer's WebUI. pauladedeji@google.com tiborg@chromium.org chrome-desktop-ntp@google.com The amount of time between the RenderFrameHost StartProvisionalLoad and DidFinishDocumentLoad events for the New Tab Footer's WebUI. rtatum@google.com tiborg@chromium.org chrome-desktop-ntp@google.com Logs the index of a clicked calendar event, with the first event at 0. Recorded when the header of an event is clicked, but not when other aspects are clicked for an expanded event. rtatum@google.com tiborg@chromium.org chrome-desktop-ntp@google.com Logs the total number of events returned by the Google Calendar API. This will include events that are filtered out in the client, but not events that are filtered out using the request query. Recorded when a response is received from the API, which will also include empty successful responses. rtatum@google.com tiborg@chromium.org chrome-desktop-ntp@google.com Logs the number of events shown on the Google Calendar Card after filtering the response from the API. This will never be more than the number of events the UI supports. Recorded when the events are first populated so it will not log when there are 0 results, since the module would not show. rtatum@google.com tiborg@chromium.org chrome-desktop-ntp@google.com Logs count of each type of user action within the NTP Google Calendar module depending on which part of the card was interacted with (event title, attachment, etc). romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Logs whether Chrome has valid user credentials for the profile the NTP is loading in. Logged when the NTP starts loading. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Height of the NTP viewport in CSS pixels. Logged when the NTP loads. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. pauladedeji@google.com danpeng@google.com chrome-desktop-ntp@google.com The elapsed time between when {ImageType} is requested by the NTP frontend and when it is loaded. NewTabPage.Images.ShownTime.BackgroundImage is only logged when the NTP loads with a background image. It is recorded once per NTP. Other {ImageType} metrics are logged every time that {ImageType} is shown. nguyenbryan@google.com yowakita@google.com bbonnet@google.com chrome-desktop-ntp@google.com Actions that take place on the Lens upload dialog on the new tab page. These may indicate user actions (interactions with the form) or the results of user actions (e.g. successful submission or showing an error message). Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. nguyenbryan@google.com yowakita@google.com bbonnet@google.com chrome-desktop-ntp@google.com Errors that occur during use of the Lens upload dialog on the new tab page.These may indicate user error (e.g. an unusable file or URL) or external errors (e.g. a network error). Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Histogram of the time, in milliseconds, it took for the NTP to load all of its tiles since navigation start. {NewTabPageTimings} romanarora@chromium.org tiborg@chromium.org chrome-analysis-team@google.com chrome-desktop-ntp@google.com The number of clicks on the static/call-to-action/animated logo on the NTP. This histogram is of special interest to the chrome-analysis-team@. Do not change its semantics or retire it without talking to them first. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Outcome of downloading search provider's logos. It measures whether download/parsing is successful, revalidation and parsing work properly, etc. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com The amount of time it took to download the static logo. This includes requests where there was no logo, or where an existing logo was revalidated (so no new image data was downloaded), but it does not include failed requests. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com A logo image (static or CTA) was downloaded. Recorded only when the image was downloaded and decoded without errors. jlebel@chromium.org chrome-mobile-search@google.com Records whenever the Google default search engine logo is displayed in the NTP. This metric is recorded only when a NTP is created and it is the only NTP open at that moment. If any other NTPs are already open, the metric is not recorded. Only measured on iOS. jlebel@chromium.org chrome-mobile-search@google.com Records whenever the 3rd party default search engine logo is displayed in the NTP. This metric is recorded only when a NTP is created and it is the only NTP open at that moment. If any other NTPs are already open, the metric is not recorded. Only measured on iOS. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com The amount of time between opening an NTP and the logo appearing. Only recorded when there is a logo, and only recorded once per NTP. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com The number of static logos and animated logos shown to users. Note that the base version of this histogram is recorded both for logos from the cache and for fresh logos, so it can be recorded twice per NTP impression. {NewTabPageLogoShownFromCache} romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Records the time until the top-level ntp-app Custom Element's |ready| callback is called. The intention is to measure how quickly the contents of new_tab_page.rollup.js (main JS bundle) are rendered. rtatum@google.com pauladedeji@google.com chrome-desktop-ntp@google.com Records whenever an error occurs during Microsoft Auth on the 1P NTP. This can only occur when Microsoft Authentication module and another Microsoft module are enabled. This can be from any type of authentication recorded as having begun in NewTabPage.MicrosoftAuth.AuthStarted. rtatum@google.com pauladedeji@google.com chrome-desktop-ntp@google.com Records the type of Microsoft Auth (Silent or Popup) whenever Microsoft authentication is initiated by the NTP. This is only logged on the 1P NTP when the Microsoft Authentication module and another Microsoft module are enabled. It can be logged because of an initial login or because an access token expires. jennserrano@google.com rtatum@google.com chrome-desktop-ntp@google.com Logs the index of a file within the Microsoft files module, with the first file index at 0. Recorded when a file is clicked. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. jennserrano@google.com rtatum@google.com chrome-desktop-ntp@google.com Logs the type of recommendation for Microsoft Sharepoint/OneDrive files that was clicked. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. jennserrano@google.com rtatum@google.com chrome-desktop-ntp@google.com The result from requesting user files from the Microsoft Graph API. Recorded after every request. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. jennserrano@google.com rtatum@google.com chrome-desktop-ntp@google.com The response size retrieved from the Microsoft Graph API. Recorded when a successful response is retrieved. A response is successful only if the response body for each request contains a list with Microsoft drive item info, which can be empty. May be more than the amount of files shown. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. jennserrano@google.com rtatum@google.com chrome-desktop-ntp@google.com Count of {RecommendationType} file recommendations shown in the SharePoint/OneDrive card. Recorded after all file suggestions have been created. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. jennserrano@google.com rtatum@google.com chrome-desktop-ntp@google.com Records the type of substitution that occurred (whether non-insight files are subsituted by trending files and vice versa). Recorded after all file suggestions have been combined. Should only be recorded for the "Combined" variation that shows both non-insight and trending files. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. jennserrano@google.com rtatum@google.com chrome-desktop-ntp@google.com Time in seconds that should be waited out before attempting another request to the Microosft Graph API because of throttling. Recorded when the response is receieved. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. hanxi@chromium.org xinyiji@chromium.org Record the total count of clicks on different modules of the New tab page. For most visited tiles: is recorded when 1) user clicks on most visited tiles; 2) long press on most visited tiles to open in a new tab or open in a new tab in group or a new incognito tab or to download the link. This is consistent with MobileNTPMostVisited. For feeds: is recorded when 1) user clicks on feeds; 2) long press on feeds to open in a new tab or open in a new incognito tab or check about this source and topic; 3) click the learn more button on the top of the feeds section. For omnibox: is recorded every time when user uses Omnibox or voice search on Omnibox to navigate. This is consistent with MobileOmniboxUse. For tab switcher button: is recorded every time when user clicks on the tab switcher button. For home button: is recorded when user clicks on the home button. For profile button: is recorded when user clicks on the profile button. For doodle logo: is recorded every time when user clicks on the doodle and navigates to another website. For menu button: is recorded when user clicks on the menu button. For composeplate button: is recorded when user clicks on the composeplate button on the fake search box. For composeplate view incognito: is recorded when user clicks on the incognito button in the composeplate view. For composeplate view voice search: is recorded when user clicks on the voice search button in the composeplate view. For composeplate view lens: is recorded when user clicks on the lens button in the composeplate view. The histogram is logged on New tab page and is Android-only. hanxi@chromium.org xinyiji@chromium.org Record the total count of long clicks on different modules of the New tab page. For home button: is recorded when user long presses on home button to edit homepage. The histogram is logged on New tab page and is Android-only. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Logged total number of times a module auto-removal event occurred, regardless of the number of modules that were auto-removed in that event. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Logged when a module is automatically removed due to inactivity. Records the persistent hash of the module ID. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. giannich@google.com romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Logged when the auto-removal logic is skipped for a module. This can happen due to a variety of reasons, and it's the default steady state for modules. The recorded metric value is the persistent hash of the module ID. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. giannich@google.com romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Logged when the staleness count is updated for a module. This is logged only once per staleness threshold update interval, which is typically once a day. Note that the value being logged is the old staleness count. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Logged total number of times a module auto-removal was undone by the user, regardless of the number of modules that were auto-removed in that event. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Logged when module auto-removal was undone. Records the persistent hash of the module ID. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Records hashes associated with NTP modules. Logged when an NTP module makes a data request to a Chrome-external backend. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Logged when a module was disabled by {Interaction}. Only logged on the 1P NTP. Note: If the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. Note: NewTabPage.Modules.Disabled.Customize is not recorded for pre-M116 users of Panorama. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Records the dismissed modules. This is recorded when the user explicitly dismisses a module via the module remove button on the New Tab Page. Every dismissal emits a 1 which has no inherent meaning aside from a dismissal occurred. {NewTabPageModules} romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Logs for each NTP module whether it was enabled after the NTP has instantiated the modules. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. Note: In M110, the output of the metric was accidentally modified to record all modules whose descriptors where loaded. This was subsequently corrected in M114. {NewTabPageModules} romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Logged when a module was enabled by {Interaction}. Only logged on the 1P NTP. Note: If the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. Note: NewTabPage.Modules.Enabled.Customize is not recorded for pre-M116 users of Panorama. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Logged when the user hovers on a module. Only logged once per NTP and module. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Records the maximum amount that any (base histogram) or a particular (sub histograms) module was visible in the NTP content's area between load and unload of an NTP. The amount is recorded as the perdecage (x/10th) of the module's total size. Logged when the NTP unloads, such as via navigating somewhere else or closing the tab (switching tabs does not cause an unload). Logs a value into the base histogram and the corresponding sub histogram for each module that is present. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log these histograms. It is possible for this histogram to log a value of 0 if, for instance, the module was always more than 90% below the fold. {NewTabPageModules} romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Histogram of the time, in milliseconds since navigation start, it took until an NTP module header is mostly visible in the window's content area (viewport). If the module header is mostly below the page fold, the time delta will include the time it takes for the user to scroll the module into view. {NewTabPageModules} pauladedeji@google.com danpeng@google.com chrome-desktop-ntp@google.com Records the module's id when a user clicks the info button in the module's header. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. romanarora@chromium.org danpeng@google.com chrome-desktop-ntp@google.com The number of rendered module instances on the NTP. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Histogram of the time in milliseconds it took for an NTP module to load. {NewTabPageModules} pauladedeji@google.com romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Histogram of the time, in milliseconds since navigation start, it took until an NTP module loaded. Logged for modules that were loaded after the initial NTP load. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com The number of rendered modules in the NTP. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. pauladedeji@google.com romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Histogram of the time, in milliseconds since navigation start, it took until an NTP module loaded. Logged for modules that were loaded during the initial NTP load. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com This records what other modules are loaded with {NtpModule} together. Logged when the module is loaded. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. romanarora@chromium.org tiborg@chromium.org yyushkina@chromium.org chrome-desktop-ntp@google.com Histogram of the time, in milliseconds since navigation start, it took until an NTP module loaded. Logged by all modules, regardless of if they loaded at or before NTP load. {NewTabPageModules} pauladedeji@google.com romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com The number of rendered modules in the NTP after the modules container has reloaded, which usually occurs when a module is enabled after the user has previously viewed modules. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. pauladedeji@google.com romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com This records what other modules are loaded with {NtpModule} together. Logged when the module container reloads, which usually occurs when a module is enabled after the user has previously viewed modules. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Records the restord modules. This is recorded when the user explicitly restores a previously dismissed module via the toast on the New Tab Page. Every restoral emits a 1 which has no inherent meaning aside from a restoral occurred. {NewTabPageModules} romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Histogram of the time, in milliseconds since navigation start, it took until the modules showed up on the NTP. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Emitted each time a user action within an NTP module launches a module's feature. Every usage emits a 1 which has no inherent meaning aside from a usage occurred. Note for the Journeys module: Pre-M115, we only considered visit and suggestion clicks as usage. Since M115, we consider visit, suggestion, "Show all" and "Open all in tab group" as usage. {NewTabPageModules} romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Logs whether the NTP modules are visible at NTP load. giannich@google.com romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Logged when the auto-removal logic is skipped for the most visited tiles. This can happen due to a variety of reasons, and it's the default steady state for the most visited tiles. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. giannich@google.com romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Logged when the staleness count is updated for most visited tiles. This is logged only once per staleness threshold update interval, which is typically once a day. Note that the value being logged is the old staleness count. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. fredmello@chromium.org huangs@chromium.org Histogram for most visited raw scores multiplied by 10 (to capture one decimal digit), grouped by tile index. This is logged whenever the NTP scores and ranks most visited suggestions. The value is useful for algorithm improvements to enhance the relevance of tiles. fredmello@chromium.org huangs@chromium.org For each strict / lax match arm, histogram of the best matching result from "key" URL (recommended by a Most Visited Tile) to "candidate" URLs (from Tabs). Recorded when a MVT is clicked and matching is performed. Only measured on Android. adamyao@google.com chrome-desktop-ntp@google.com Logs clicks on the "Show more" and "Show less" buttons in the Most Visited component. Logged when the show more or show less action chip is clicked. dibyapal@chromium.org pwa-team@google.com This records the type of most visited app on the ntp-tile, whether it is from a default app or a custom link. Triggered as soon as a migrated default app or custom link is deleted. Warning: this histogram was expired from 2024-06-02 through 2025-05-12, data may be missing. robertlin@chromium.org chrome-prerendering@google.com Measures the time from navigation start or prerender activation to first contentful paint for NTP-initiated navigations. The metrics is recorded when painting timing update events are dispatched by PageLoadMetricsUpdateDispatcher. Refer to NewTabPageInitiatedPageLoadMetricsObserver::OnFirstContentfulPaintInPage() for details. robertlin@chromium.org chrome-prerendering@google.com Measures the time from navigation start or prerender activation to first meaningful paint for NTP-initiated navigations. The metrics is recorded when painting timing update events are dispatched by PageLoadMetricsUpdateDispatcher. Refer to NewTabPageInitiatedPageLoadMetricsObserver::OnFirstMeaningfulPaintInMainFrameDocument() for details. robertlin@chromium.org chrome-prerendering@google.com Measures the time from navigation start or prerender activation to largest contentful paint for NTP-initiated navigations. The metrics is recorded when painting timing update events are dispatched by PageLoadMetricsUpdateDispatcher. Refer to NewTabPageInitiatedPageLoadMetricsObserver::OnComplete() for details. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com The time it took until a request from the New Tab page for the OneGoogleBar script was served. Recorded only on the local NTP. {NewTabPage_OneGoogleBar_RequestLatency} romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Histogram of the time, in milliseconds since navigation start, it took until the OneGoogleBar showed up on the NTP. Recorded only on the local NTP. eirage@chromium.org hanxi@chromium.org Records the TabLaunchType enum when a New Tab Page (NTP) is created in a new tab. This histogram is logged when a new tab is created, including manually created New Tab or the initial tab at Chrome startup. This histogram is Android-only. jennserrano@google.com rtatum@google.com chrome-desktop-ntp@google.com Logs the index of a clicked calendar event on the Outlook Calendar module, with the first event at 0. Recorded when the header of an event is clicked, but not when other aspects are clicked for an expanded event. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. jennserrano@google.com rtatum@google.com chrome-desktop-ntp@google.com The result from requesting calendar events from the Microsoft Graph API. Recorded after every request. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. jennserrano@google.com rtatum@google.com chrome-desktop-ntp@google.com The number of calendar events retrieved from the Microsoft Graph API. Recorded when a successful response is retrieved. A response is successful only if it contains a list of events, which can be empty. May be more than the amount of events shown. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. jennserrano@google.com rtatum@google.com chrome-desktop-ntp@google.com Logs the number of events shown on the Outlook Calendar module after filtering the response from the Microsoft Graph API. This will never be more than the number of events the UI supports. Recorded when the events are first populated so it will not log when there are 0 results, since the module would not show. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. jennserrano@google.com rtatum@google.com chrome-desktop-ntp@google.com Time in seconds that should be waited out before attempting another request to the Microosft Graph API because of throttling. Recorded when the response is receieved. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. jennserrano@google.com rtatum@google.com chrome-desktop-ntp@google.com Logs count of each type of user action within the Outlook Calendar module, depending on which part of the card was interacted with (event title, attachment, etc). Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. robertlin@chromium.org chrome-prerendering@google.com Measures the time from the prerendering navigation starts to prerender activation. This metrics is recorded upon prerneder activation. Refer to NewTabPageInitiatedPageLoadMetricsObserver::DidActivatePrerenderedPage() for details. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Logs when action is taken on promo e.g. dismissal or restoration. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. dbeam@chromium.org yyushkina@chromium.org chrome-analysis-team@google.com Emitted each time a promo linked is clicked on the local NTP. This histogram is of special interest to the chrome-analysis-team@. Do not change its semantics or retire it without talking to them first. mahmadi@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Logs how many times various promo browser commands are executed. Triggered when a supported and enabled promo browser commandis executed by the BrowserCommandHandler. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com The time it took until a request from the New Tab page for the middle slot promo script was served. Recorded on the local and WebUI NTP. {NewTabPage_Promos_RequestLatency2} romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Histogram of the time, in milliseconds since navigation start, it took until a middle slot promo showed up on the NTP. Recorded on the local and WebUI NTP. sophiechang@chromium.org chrome-desktop-ntp@google.com Counts the number of paste actions performed in the New Tab Page realbox. Recorded every time the user pastes into the realbox. ender@google.com mahmadi@chromium.org chrome-omnibox-team@google.com Records the type of the SuggestTile that the user deleted. Most Visited URLs record a URL, and Organic Repeatable Queries record a Search type. Recorded every time the user initiates deletion of a suggest tile, that results with tile removal. Not recorded if the user chooses to cancel the action. ender@google.com mahmadi@chromium.org chrome-omnibox-team@google.com Records the type of the SuggestTile that the user interacted with. Most Visited URLs record a URL, and Organic Repeatable Queries record a Search type. Recorded every time the user selects the tile to initiate navigation, even if the navigation could not be completed (eg. target site did not load). tiborg@chromium.org chrome-desktop-ntp@google.com Records the position of the tab group that was clicked on the NTP Tab Groups module. tiborg@chromium.org chrome-desktop-ntp@google.com Records clicks on the Create New Tab Group button from {ExperimentalState} in the Tab Groups module. mfacey@google.com romanarora@google.com chrome-desktop-ntp@google.com Records the position of the tab that was clicked on the NTP Tab Resumption module. Only logged on the 1P NTP and when the Tab Resumption module is enabled. mfacey@google.com romanarora@google.com chrome-desktop-ntp@google.com Records result status of the fetcher. Only logged on the 1P NTP and when the Tab Resumption module is enabled. mfacey@google.com romanarora@google.com chrome-desktop-ntp@google.com Records the clicks on the See More button in the Tab Resumption module. Only logged on the 1P NTP and when the Tab Resumption module is enabled. mfacey@google.com romanarora@google.com chrome-desktop-ntp@google.com Records the number of tabs shown in the Tab Resumption module. Only logged on the 1P NTP and when the Tab Resumption module is enabled. mfacey@google.com romanarora@google.com chrome-desktop-ntp@google.com Records the time elapsed since the url visit that was clicked was last visited. Only logged on the 1P NTP and when the Tab Resumption module is enabled. mfacey@google.com romanarora@google.com chrome-desktop-ntp@google.com Records the data type of each entry shown in the tab resumption module. Logged when the module is shown on the NTP. Only logged on the 1P NTP and when the Tab Resumption module is enabled. mfacey@google.com romanarora@google.com chrome-desktop-ntp@google.com Records the source (history vs. tab) of the URL visit continuation suggestion that was clicked on the NTP Tab Resumption module. Only logged on the 1P NTP and when the Tab Resumption module is enabled. mfacey@google.com romanarora@google.com chrome-desktop-ntp@google.com Records the position of the visit that was dismissed on the NTP Tab Resumption module. Only logged on the 1P NTP and when the Tab Resumption module is enabled. mfacey@google.com romanarora@google.com chrome-desktop-ntp@google.com Records the position of the visit that was dismissed and then restored on the NTP Tab Resumption module. Only logged on the 1P NTP and when the Tab Resumption module is enabled. romanarora@chromium.org chrome-desktop-ntp@google.com Logs count of each type of user action within the threads rail. Only logged on the 1P NTP. Note that Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. romanarora@chromium.org chrome-desktop-ntp@google.com Recorded when the threads rail is shown on the New Tab Page. This is recorded once when the threads rail is attached to DOM. Only logged on the 1P NTP. Note that Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Logged when a 1P NTP starts loading. Logs the time since the last time a 1P NTP in the same profile started loading. Note the following: (a) The first NTP load ever is not counted. (b) This value is computed using a client-side clock and stored in prefs. As such, (i) it works across sessions and (ii) it can show strange values if a user changes their clock. (c) Even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. freedjm@chromium.org feed@chromium.org olivierrobin@chromium.org The time spent on the new tab page as measured from when it was loaded or last brought to the foreground until it was navigated away from or hidden. Only measured on Android and iOS. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Records the status of the New Tab page URL when an NTP is opened. freedjm@chromium.org feed@chromium.org Android: The estimated average number of hours between two successive times when the user opens a content suggestion or clicks on the "More" button. Recorded after each time a suggestion or a More button is clicked (and after updating the model used for the estimate). romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Actions taken by users of Voice Search on the local New Tab Page on Desktop. These actions may navigate away from the NTP (e.g. submitting a speech query), but can also happen without navigating away from the NTP (e.g. initiating or retrying Voice Search). romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Errors that occur during Voice Search use on the local New Tab Page on Desktop. These may be user-induced (e.g. the user's utterance could not be recognized - no match), or resulting from external circumstances (e.g. offline, lack of microphone permission). Warning: this histogram was expired from 2025-01-31 to 2026-07-13; data may be missing. pauladedeji@google.com tiborg@chromium.org rtatum@google.com chrome-desktop-ntp@google.com Histogram of the time, in milliseconds, it takes to process the Wallpaper Search results after we get the images back from the server. This tracks the time from server response until the images are sent to the UI. pauladedeji@google.com tiborg@chromium.org rtatum@google.com chrome-desktop-ntp@google.com Histogram that records the type of wallpaper search theme that was kept at the end of a wallpaper search session, if any at all. This records the type of wallpaper search theme set during a customize chrome side panel session if it is still set when the customize chrome side panel is closed. pauladedeji@google.com tiborg@chromium.org rtatum@google.com chrome-desktop-ntp@google.com Histogram of the time, in milliseconds, it took to set an inspiration Wallpaper Search theme as the current theme. This tracks how long the image processing takes from the time image processing starts for setting an inspiration Wallpaper Search theme to when the profile preference is set to change the background image. pauladedeji@google.com tiborg@chromium.org rtatum@google.com chrome-desktop-ntp@google.com Histogram of the time, in milliseconds, it took to set a recent Wallpaper Search theme as the current theme. This tracks how long the image processing takes from the time image processing starts for setting a recent Wallpaper Search theme to when the profile preference is set to change the background image. pauladedeji@google.com tiborg@chromium.org rtatum@google.com chrome-desktop-ntp@google.com Histogram of the time, in milliseconds, it took to set a Wallpaper Search result as the current theme. This tracks how long the image processing takes from the time image processing starts for setting a Wallpaper Search result theme to when the profile preference is set to change the background image. pauladedeji@google.com tiborg@chromium.org rtatum@google.com chrome-desktop-ntp@google.com Histogram of the statuses shown for Wallpaper Search within the Customize Chrome Side Panel. This records the status is of Wallpaper Search's UI whenever it loads, a search is triggered, or a search completes. romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Width of the NTP viewport in CSS pixels. Logged when the NTP loads. Only logged on the 1P NTP. Note that even if the user has Google as their default search engine, Incognito and Guest mode NTPs are not considered 1P and don't log this histogram. adamyao@google.com chrome-desktop-ntp@google.com Logs whether the Most Visited tiles were in the expanded state (showing more than the default number of tiles) when {MostVisitedSurface} was loaded. Logged when Most Visited tiles are rendered (e.g., on load and refresh). True (1) is logged when the Most Visited tiles are expanded, showing more than the default number of tiles. False (0) is logged when they are not expanded, showing the default number of tiles. fredmello@chromium.org huangs@chromium.org ginnyhuang@chromium.org The number of Custom Tiles on {MostVisitedSurface} the first time it opens for a profile, assuming Custom Tiles are enabled. justincohen@chromium.org mastiz@chromium.org romanarora@chromium.org tiborg@chromium.org chrome-analysis-team@google.com chrome-desktop-ntp@google.com Histogram for user clicks of the most visited tile on {MostVisitedSurface}. The value is equal to the index of the tile. For special types of results: * Clicks on the "Add Shortcut" tile are not counted. * Clicks on the Explore Sites tile on Android are counted. The user action {MostVisitedSurface}.MostVisited.Clicked is also logged at the same time as this histogram. This histogram is of special interest to the chrome-analysis-team@. Do not change its semantics or retire it without talking to them first. {NewTabPageIconTypes} niharm@google.com chrome-desktop-ntp@google.com Histogram for user clicks of the most visited tile by suggestion provider on {MostVisitedSurface}. The value is equal to the index of the tile. {NewTabPageProviders} romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com The number of tiles that are on {MostVisitedSurface}, no matter if they are thumbnails, gray tiles, or external tiles. Recorded before reloading the suggestions, navigating to a URL, switching tabs, changing the active window or closing the tab/shutting down Chrome. The sum of this histogram does not have to equal to the total count of tile impressions (such as the total count in {MostVisitedSurface}.TileType). The reason is that not all tiles have to be impressed initially (e.g., the second row of tiles may be initially out of sight on iOS). romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Histogram for impressions on the various most visited tiles on {MostVisitedSurface}. The value is equal to the index of the thumbnail. {NewTabPageIconTypes} romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Histogram for impressions on the various most visited tiles on {MostVisitedSurface}. The value is equal to the index of the thumbnail. {NewTabPageProviders} romanarora@chromium.org tiborg@chromium.org ginnyhuang@chromium.org chrome-desktop-ntp@google.com Records the source for the name a most visited tile showed when the user clicked it on {MostVisitedSurface}, e.g. a URL, or the page title. {NewTabPageProviders} romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com Records the source of the title for each most visited tiled displayed when {MostVisitedSurface} is opened, e.g. a short_name from a manifest, or the page title. {NewTabPageProviders} romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com The visual type of the most visited item that the user clicked on on {MostVisitedSurface}, e.g. actual thumbnail or placeholder thumbnail. {NewTabPageProviders} romanarora@chromium.org tiborg@chromium.org chrome-desktop-ntp@google.com The visual type of each most visited tile displayed on {MostVisitedSurface}, e.g. actual thumbnail or placeholder thumbnail. This is recorded for each most visited item when {MostVisitedSurface} is opened. {NewTabPageProviders}