qinmin@chromium.org shaktisahu@chromium.org Records events related to attaching a notification to a download job to keep the chrome running during a download. This is recorded either when the notification is first attached, or when the job completes while no notification is attached. This is only recorded on Android U and above. qinmin@chromium.org dtrainor@chromium.org Records user interactions with the open download dialog on Android. Records when the dialog is shown, or when user clicks on a button or dismisses the dialog. qinmin@chromium.org dtrainor@chromium.org Records whether opening a pdf download on Android triggers opening an existing downloaded file, instead of creating a new file. This metric is only recorded when Chrome enables rendering PDFs inside a tab, and it is reorded once each time a PDF is displayed. qinmin@chromium.org peter@chromium.org Records key lifecycle events (Triggered and Propagated) of download resumptions initiated from notification click interactions. Measured on Android. qinmin@chromium.org peter@chromium.org Records the time elapsed from the user clicking the 'Resume' button on a download notification to when the browser successfully loads and initiates the download resumption. Measured on Android. yawfrempong@google.com chrome-counter-abuse-alerts@google.com Records events and user interactions with the download warning bypass dialog on Android. Records when the dialog is shown, or when the user takes an action or dismisses the dialog. dtrainor@chromium.org xinghuilu@chromium.org yawfrempong@google.com chrome-counter-abuse-alerts@google.com Downloads extension API function calls. Warning: this histogram was expired from 2020-03-08 to 2022-08-02 and 2026-07-05 to 2026-08-04; data may be missing. dtrainor@chromium.org chrome-counter-abuse-alerts@google.com Time taken to invoke IAttachmentExecute::Save() excluding the time taken to instantiate CLSID_AttachmentServices. Warning: this histogram was expired from 2020-02-23 to 2023-01-30; data may be missing. qinmin@chromium.org Overall bandwidth seen for a completed download. This includes all file downloads going through the download subsystem, but excludes all the page saves. Note that this is measured at the point at which the file is written, and so will not take into account the time costs of activities that occur after file write is completed (e.g. safe browsing scanning). The maximum bucket range is 200Mbps. twellington@chromium.org clhager@google.com Records the content type of downloads that have been blocked on automotive, as Chrome on automotive blocks any downloads that cannot be viewed natively in Chrome. yawfrempong@google.com chrome-counter-abuse-alerts@google.com Records each time a download command is executed on download bubble. It is logged when a quick action is clicked on the primary view or a button or link is clicked on the security subpage. Actions on context menu are excluded. Clicking the trasparent button is also excluded. This histogram replaced Download.Bubble.ProcessedCommand in M120 due to the enum being incorrectly numbered. Warning: this histogram was expired from 2025-09-14 to 2026-01-27; data may be missing. kerenzhu@chromium.org robliao@chromium.org Measures the time (in ms) from download toolbar button click to when Download Bubble full view becomes visible. Recorded only for Desktop platforms, where Download Bubble is enabled. qinmin@chromium.org clank-downloads@google.com Records why the download is canceled. shaktisahu@chromium.org clank-downloads@google.com Types of audio files that are downloaded. dtrainor@chromium.org Types of images that are downloaded. shaktisahu@chromium.org clank-downloads@google.com Types of text files that are downloaded. shaktisahu@chromium.org clank-downloads@google.com Types of video files that are downloaded. xinghuilu@chromium.org chrome-counter-abuse-alerts@google.com This histogram is used to record the different actions and events associated with the download UI context menu on desktop platforms, which can be shown through interacting with the download bubble. This metric records when the dropdown button was clicked as well when DownloadCommands were enabled or executed. Each action or enable event is only emitted once; as a result, it is safe to compute a ratio by dividing enabled events by clicked events. shaktisahu@chromium.org yawfrempong@google.com clank-downloads@google.com Various individual counts in the download system; see DownloadCountType for details. {ParallelizableDownload} Warning: this histogram was expired from 2025-11-16 to 2026-04-12; data may be missing. qinmin@chromium.org Records user interactions with the dangerous download dialog on Android. Records when the dialog is shown, or when user clicks on a button or dismisses the dialog. qinmin@chromium.org Records whether the download database is available when database startup completes, before starting any pending downloads. If the database is available, it will provide the next download id. Or no download history will be persisted. dtrainor@chromium.org xinghuilu@chromium.org chrome-counter-abuse-alerts@google.com User actions in chrome://downloads. Warning: this histogram was expired from M77 to 2022-09-20; data may be missing. vakh@chromium.org chrome-counter-abuse-alerts@google.com Records when user {Action} while attempting to recover a blocked download from chrome://downloads, for a file of type {DownloadDangerTypeString}. This is logged from both old the native UI DownloadDangerPrompt as well as its replacement WebUI prompt DownloadBypassWarningConfirmationDialog (under the ImprovedDownloadPageWarnings feature). dtrainor@chromium.org clank-downloads@google.com The size of successfully completed downloads. {Download_Parallelizable} qinmin@chromium.org clank-downloads@google.com Records whether a download is a duplicate when user triggers a pdf download. This is logged when the download starts, and is only recorded on Android. The value logs whether the pdf will be opened inline. qinmin@chromium.org clank-downloads@google.com The count of HTTP Response codes for download requests. {BackgroundDownload} tommasin@chromium.org chrome-incognito@google.com Records the clicks on Incognito download message in Android, when users click download or dismiss the message. qinmin@chromium.org shaktisahu@chromium.org Records errors when reading from the mojo input stream before a download completes. jdeblasio@chromium.org estark@chromium.org cthomp@chromium.org Records security state of downloads to support analysis for mixed content file download blocking. qinmin@chromium.org clank-downloads@google.com The reason that a parallel download was interrupted. qinmin@chromium.org clank-downloads@google.com The reason that a download was interrupted. {DownloadSource} alexmitra@chromium.org clank-downloads@google.com Records any user action taken within a download interstitial. Download interstitials are shown only on Android inside CCTs. qpubert@google.com olivierrobin@chromium.org bling-squid-squad@google.com Result when the warning alert is presented before downloading a .order file on iOS. Values indicate if the user has continued the download workflow after the presentation of the warning alert. The histogram will be emitted once upon presentation of the alert, and a second time when the user dismisses the alert by performing one of the alert actions. qpubert@google.com olivierrobin@chromium.org bling-squid-squad@google.com Logged at different stages of downloading a USDZ MIME type AR model on iOS. qpubert@google.com olivierrobin@chromium.org bling-squid-squad@google.com Recorded when a user attempts to download a bundled PassKit file on iOS. qpubert@google.com olivierrobin@chromium.org bling-squid-squad@google.com Result when the warning alert is presented before downloading a .ics file on iOS. Values indicate if the user has continued the download workflow after the presentation of the warning alert. qpubert@google.com olivierrobin@chromium.org bling-squid-squad@google.com The action that a user takes on a file after it has been successfully downloaded on iOS. qpubert@google.com olivierrobin@chromium.org bling-squid-squad@google.com Positive net error codes that happen in the case of download content fetch failure. qpubert@google.com olivierrobin@chromium.org bling-squid-squad@google.com Logged when the download is completed (successfully or not) or in-progress download was cancelled because of the app termination. This histogram includes information whether the download was successful and whether or not the download task was running while the app was active. qpubert@google.com olivierrobin@chromium.org bling-squid-squad@google.com Result when a user attempts to download a file on iOS. qpubert@google.com olivierrobin@chromium.org bling-squid-squad@google.com Result when a user attempts to present the download UI on iOS. Looged when download is created. qpubert@google.com olivierrobin@chromium.org bling-squid-squad@google.com Result when the download UI is prexsented on iOS. Values indicate if Google Drive is installed and whether or not Install Google Drive promo was shown. Logged when download is updated. qpubert@google.com olivierrobin@chromium.org bling-squid-squad@google.com MIME type of a download response. Logged when the download UI was offered by the browser to the user. qpubert@google.com olivierrobin@chromium.org bling-squid-squad@google.com Result when the warning alert is presented before downloading a .mobileconfig file on iOS. Values indicate if the user has continued the download workflow after the presentation of the warning alert. qpubert@google.com olivierrobin@chromium.org bling-squid-squad@google.com Whether the download file path was ready when the user tapped "Open in..." from the download manager. qpubert@google.com olivierrobin@chromium.org bling-squid-squad@google.com Recorded when a user attempts to download a PassKit file on iOS. qpubert@google.com olivierrobin@chromium.org bling-squid-squad@google.com The user discarded in-progress download and replaced with the new one. Only recorded after the user interacts with a dialog offering the choice between replacing an in-progress download versus downloading separately to a new filename. qpubert@google.com olivierrobin@chromium.org bling-squid-squad@google.com Result of an attempt to present Add Passes dialog on iOS. qpubert@google.com olivierrobin@chromium.org bling-squid-squad@google.com Result when a user attempts to present a USDZ MIME type AR model on iOS. shaktisahu@chromium.org clank-downloads@google.com The size of downloads when the user tries to download at a scheduled time. Recorded when the positive button in download later dialog is clicked. shaktisahu@chromium.org clank-downloads@google.com The user selection in the download later dialog. Recorded when the user starts a download, or clicking the change button on download infobar and download home UI. {DownloadDialogSource} shaktisahu@chromium.org clank-downloads@google.com Records events for download later feature in download Android UI. dtrainor@chromium.org qinmin@chromium.org Records events for local media metadata parsing. dtrainor@chromium.org qinmin@chromium.org Records events when using media parser to analyze local media files. fdoray@chromium.org catan-team@chromium.org Records the number of URLs in the URL chain (url_chain_ member of DownloadResponseHandler) when {Location}. fdoray@chromium.org catan-team@chromium.org Records the estimated memory usage of the URL chain (url_chain_ member of DownloadResponseHandler) in KB when {Location}. dtrainor@chromium.org Network connection type when starting a new download. {DownloadSource} yawfrempong@google.com chrome-counter-abuse-alerts@google.com Records user interactions with the non-dangerous download dialog on Android. Records when the dialog is shown, or when user clicks on a button or dismisses the dialog. shuyng@google.com clank-downloads@google.com Records the source when download is forwarding from Chrome to an external app to open. Recorded when the view intent is handled; even if the intent picker is dismissed. Only record when there is an app to handle the intent. Logged on Android only. sideyilmaz@chromium.org chrome-incognito@google.com Records the profile type for opening the Downloads page. This may be triggered by different entry points like mobile menu, notification or info bar. sideyilmaz@chromium.org chrome-incognito@google.com Records the profile type for opening the Downloads page from menu. dtrainor@chromium.org chrome-analysis-team@google.com Invocation count for methods of opening a download. For some file types, Chrome defaults to opening the file in the browser instead of invoking the system handler. The user has the option of overriding this behavior. This histogram is of special interest to the chrome-analysis-team@. Do not change its semantics or retire it without talking to them first. qinmin@chromium.org clank-downloads@google.com clank-downloads@google.com The download path generation behavior which happens before download path validation in download target determination process. {DownloadType} qinmin@chromium.org clank-downloads@google.com The download path validation result before the final download target is determined. {DownloadType} qinmin@chromium.org Records user interactions with the policy warning dialog on Android. Records when the dialog is shown, or when user clicks on a button or dismisses the dialog. yawfrempong@google.com clank-downloads@google.com Records various types of messages representing the state of the downloads as they are shown on the download progress infobar on android. Warning: this histogram was expired from 2023-06-25 to 2026-12-04; data may be missing. shaktisahu@chromium.org clank-downloads@chromium.org The file size of completed background download. Recorded when background downloads are finished. shaktisahu@chromium.org clank-downloads@google.com Records a failed database operation. shaktisahu@chromium.org clank-downloads@google.com Records a successful database operation. shaktisahu@chromium.org clank-downloads@google.com The total number of database records used by download service, and the number of records in each entry state. {Download_Service_EntryState} shaktisahu@chromium.org clank-downloads@google.com The interrupt reason for failed downloads in download service. dtrainor@chromium.org shaktisahu@chromium.org An action the download service took on an active download. Note that this histogram was expired between M88 and 2023-03-03. dtrainor@chromium.org shaktisahu@chromium.org Records how many attempts have taken place at the time of a retry for a download in the Download Service. This differs from Download.Service.Entry.ResumptionCount, which records resumptions not complete restarts. Note that this histogram was expired between M88 and 2023-03-03. shaktisahu@chromium.org clank-downloads@google.com The number of files that have been deleted by external application or the user, when performing clean up tasks in download service. {Download_Service_CleanUpReason} shaktisahu@chromium.org clank-downloads@google.com The number of failed file deletion attempts, when performing clean up tasks in download service. {Download_Service_CleanUpReason} shaktisahu@chromium.org clank-downloads@google.com The number of files successfully deleted, when performing clean up tasks in download service. {Download_Service_CleanUpReason} shaktisahu@chromium.org clank-downloads@google.com The error code when failed to create the download directory. shaktisahu@chromium.org clank-downloads@google.com The lifestime of a download file, which begins from the download completion to the file being deleted by the clean up task. shaktisahu@chromium.org clank-downloads@google.com The completion type for downloads in download service. shaktisahu@chromium.org The reason for suspending a download right after the upload data is received from the client. Every pause will result in two entries in the histogram: ANY and a more specific reason. shaktisahu@chromium.org The reason for pausing an in-progress download. Every pause will result in two entries in the histogram: ANY and a more specific reason. shaktisahu@chromium.org clank-downloads@google.com Records the API calls on download service. {Download_Service_Client} shaktisahu@chromium.org clank-downloads@google.com The start up result of the download service. {Download_Service_StartUpStep} shaktisahu@chromium.org clank-downloads@google.com The platform background tasks used by download service will invoke native functions after being scheduled. The tasks may be aborted or canceled. This metric records the status of background tasks when native functions are invoked. {Download_Service_TaskType} chlily@chromium.org chrome-counter-abuse-alerts@google.com This tracks drag events on a complete download on the shelf, and also general download completion on the shelf as a point of reference. drubery@chromium.org chrome-counter-abuse-alerts@google.com A download warning was shown in the shelf/bubble. Note that some downloads may not be shown on the shelf, e.g., if a download is not new, is transient, or if the shelf is disabled by an extension using the Downloads API. Similarly, the bubble also does not show transient downloads. Grouped by the type of danger. This histogram is logged on ChromeOS since M93. This metric is used to populate a dashboard on go/crsb-site. yawfrempong@google.com chrome-counter-abuse-alerts@google.com A download warning was shown on the chrome://downloads page. This is logged once per dangerous or suspicious download, when it is shown for the first time on chrome://downloads, once per Chrome session (i.e. may be logged again after Chrome restarts). Value logs the type of danger. Note: This histogram is recorded each time a warning is shown for a download, even when attempting to download the same file. Warning: this histogram was expired from 2025-09-08 to 2026-01-27; data may be missing. qinmin@chromium.org clank-downloads@google.com The initiation source (if initiated within the above-content layer of chrome) for a download. shaktisahu@chromium.org drubery@chromium.org Content types of the downloads. This histogram is logged when a download is started. Logged on Desktop platforms. Warning: This histogram had expired from M85 to M106, data may be missing. shaktisahu@chromium.org clank-downloads@google.com Content types of the downloads that are started in non-incognito profile. This histogram is logged when a download is started. Logged on Desktop platforms. Warning: This histogram had expired from 2022-05-01 to 2022-08-15, data may be missing. qinmin@chromium.org clank-downloads@google.com Records content types of the downloads that are started in non-incognito profile, divided by whether the download is transient. This histogram is logged when a download is started. Logged on Android only. qinmin@chromium.org clank-downloads@google.com Records content types of the downloads, divided by whether the download is transient. This histogram is logged when a download is started. Logged on Android only. sideyilmaz@chromium.org chrome-incognito@google.com The browser profile type for each download started, recorded just after download successfully started. drubery@chromium.org chrome-safebrowsing-team@chromium.org User chose to save a download which was marked dangerous. Grouped by the type of danger. This metric is used to populate a dashboard on go/crsb-site. yawfrempong@google.com chrome-counter-abuse-alerts@google.com User chose to save a download which was marked dangerous or suspicious from the chrome://downloads page, or the bypass prompt triggered from there. Value logs the type of danger. dtrainor@chromium.org qinmin@chromium.org Records events for local video thumbnail retrieval. xinghuilu@chromium.org chrome-counter-abuse-alerts@google.com Records the warning action that is successfully added in warning action event. Logged each time an action is taken on the download warning. For the SHOWN action, only logged for the first time. Not logged if the action is not added because the first warning is missing or the events have exceeded the max length. xinghuilu@chromium.org chrome-counter-abuse-alerts@google.com Records whether a download warning action event was sent, or if not, then why not. Logged each time an action is taken on the download warning. Version 2 was introduced to log NOT_ADDED_DOWNLOAD_NOT_DANGEROUS. xinghuilu@chromium.org chrome-counter-abuse-alerts@google.com Records the warning surface that does not have a warning shown event logged in advance. Logged each time an action is taken on the download warning and there is no warning shown event logged (the NOT_ADDED_MISSING_FIRST_WARNING bucket in DownloadAddWarningActionEventOutcome). awado@google.com jacastro@chromium.org The amount of time between starting the provisional load and fully loading the document in the main frame of the chrome://downloads page. This corresponds to the WebContentsObserver::DocumentLoadedInFrame method. awado@google.com jacastro@chromium.org The amount of time between starting the provisional load and having completed the onload handler in the main frame of the chrome://downloads page. This corresponds to the WebContentsObserver::DocumentOnLoadCompletedInPrimaryMainFrame method.