arichiv@chromium.org src/net/cookies/OWNERS Emits when a cookie restore is attempted by Android Incognito Mode session restoration. This happens if an in-progress incognito session is killed by the system (e.g., memory pressure) and not by the user. The enum value is true when the cookie was restored properly and false if it was rejected. Rejection should be rare as the cookies are directly written out by the system. dylancutler@google.com src/net/cookies/OWNERS This histogram records the average sum of the sizes of the name and value of all cookies per domain. This metric is recorded every 10 minutes. morlovich@chromium.org Recorded when a problem occurs trying to commit changes to the cookie store back to disk, in the SQLite store. dylancutler@google.com src/net/cookies/OWNERS This histogram records the sum of the sizes of the name and value of all cookies in the cookie jar. This metric is recorded every 10 minutes. dylancutler@google.com src/net/cookies/OWNERS This histogram records the sum of the sizes of the name and value of all cookies in a single partition of the partitioned cookie jar. This metric is recorded every 10 minutes and emits one event per partition. This metric is only recorded when partitioned cookies are enabled. estark@chromium.org Number of times a cookie was set with a name prefixed by "__Secure-" or "__Host-" (prefixes reserved by https://tools.ietf.org/html/draft-west-cookie-prefixes). Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. miketaylr@chromium.org src/net/cookies/OWNERS The scheme a cookie was set by and the scheme of the request that the cookie was sent to. This is recorded once per cookie each time a URL request has its headers set. Warning: this histogram was expired from 2026-07-29 to 2026-08-25; data may be missing. miketaylr@chromium.org src/net/cookies/OWNERS For each cookie added to the store, record the source URL's scheme. Schemes we're unfamiliar with will be put into the "Other Scheme" bucket. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. arichiv@chromium.org src/net/cookies/OWNERS This metric records whether the DB could be reinitialized after corruption. Note that corruption could occur due to attempting to load an unsupported variant of the cookie db (e.g., code supports v15+ and tries to load v12). If recorded as true, recovery was possible. If recorded as false, then recovery was not possible for some reason. The latter should be rare. This metric is recorded when the cookie DB is first initialized. morlovich@chromium.org src/net/cookies/OWNERS Number of cookies in the store (recorded every 10 minutes of active browsing time), with a wider range than Cookie.Count. yoichio@chromium.org chrome-loading@google.com Records whether MaybeInitializeDatabaseEarly actually attempted to create the database early, regardless of success or failure. Logged on every call to SQLitePersistentCookieStore::Backend::MaybeInitializeDatabaseEarly miketaylr@chromium.org src/net/cookies/OWNERS The SameSite attribute of a cookie whose inclusion is changed by considering redirects as part of the same-site context calculation. I.e., this is logged for cookies which are included if not considering redirects when calculating the same-site context, but are excluded (solely due to the SameSite attribute) if cross-site redirects can cause a request to be considered cross-site. This is only recorded for cookies accessed over HTTP, since redirects are not relevant for JS cookie accesses. This is logged for each cookie (whose inclusion is changed) when it is {AccessType}, regardless of whether the cookie was ultimately included. miketaylr@chromium.org src/net/cookies/OWNERS The type of redirects a cookie experienced before ultimately being accessed. This metric is triggered whenever a cookie is attempted to be accessed by an HTTP request or response. It does not matter if the access succeeds, only that one was attempted. The metrics exists primarily to act as a denominator for Cookie.CrossSiteRedirectDowngradeChangesInclusion2.{AccessType}. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. Warning: this histogram was expired from 2025-08-10 to 2025-02-24; data may be missing. Warning: this histogram was expired from 2026-08-10 to 2026-08-25; data may be missing. arichiv@chromium.org src/net/cookies/OWNERS Number of days since a cookie was updated, collected when cookies are loaded into memory at browser start. This is used to track how many cookies are in danger of expiring due to the proposed 400 day maximum expiration day limit. johannhof@chromium.org src/net/cookies/OWNERS Whether a site tried to set a cookie with a Domain attribute that has at least one non-ASCII character in it. This metric is recorded everytime a cookie is created from a string (i.e. when it is set via Set-Cookie or document.cookie write), regardless of whether or not the cookie is ultimately stored. miketaylr@chromium.org src/net/cookies/OWNERS Was a cookie set with a Domain attribute. This metric is recorded once per included cookie on set attempts. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. Warning: this histogram was expired from 2026-08-09 to 2026-08-25; data may be missing. miketaylr@chromium.org src/net/cookies/OWNERS Records if a cookie has a double underscore prefixed name, excluding the cookie prefixes. I.e.: __Secure- and __Host- prefixed names are ignored. This metric is recorded when a cookie is successfully created using CanonicalCookie::Create. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. wfh@chromium.org src/net/cookies/OWNERS Records whether or not an entry in the cookie database has both encrypted and plaintext values, which should not happen. This metric is recorded every time a cookie is parsed from the cookie database during load. wfh@chromium.org src/net/cookies/OWNERS The exact database error encountered if initializing the cookies database fails catastrophically. Initializing the cookies database happens once per network context configured with persistent cookies, so this metric could be reported multiple times from the same client. Catastrophic errors are defined in sql::IsErrorCatastrophic. dylancutler@google.com sandormajor@chromium.org Records what types of rules are present in the CookiesAllowedForUrls policy. This policy supports content settings that only apply to the cookie's site, only apply to the top-level site, and rules that apply to both. This histogram is recorded when the CookiesAllowedForUrls policy is first loaded. Only recorded when the policy contains at least one valid rule. Warning: this histogram was expired from 2026-07-09 to 2026-08-25; data may be missing. arichiv@chromium.org kaustubhag@chromium.org Number of minutes until non-Secure cookie expires when set. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. The buckets range max was resized from 10 years in minutes in Cookie.ExpirationDurationMinutesNonSecure.Subsampled to 400 days in minutes as that's the cap on cookie max-age. arichiv@chromium.org kaustubhag@chromium.org Number of minutes until Secure cookie expires when set. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. The buckets range max was resized from 10 years in minutes in Cookie.ExpirationDurationMinutesSecure.Subsampled to 400 days in minutes as that's the cap on cookie max-age. cfredric@chromium.org kaustubhag@chromium.org The number of queries that were delayed (i.e. answered asynchronously instead of synchronously). Recorded once during initialization, for each context. (This means once per browser-run in the browser process; and once each time the Network Service is started.) The metric is emitted even when First-Party Sets is disabled. cfredric@chromium.org kaustubhag@chromium.org The length of time between when the first asynchronous query was received, and when asynchronous queries started to be answered. Recorded once during initialization, for each context. (This means once per browser-run in the browser process; and once each time the Network Service is started.) Recorded for all clients, even those with low-resolution clocks. If the context was initialized before any queries were made (including if the feature is disabled entirely), 0 is recorded. awillia@chromium.org src/net/cookies/OWNERS If a canonical cookie created via the given caller has a valid name+value length. Logged whenever a cookie is created FromStorage and if this cookie IsCanonical. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. anthonyvd@chromium.org chrome-catan@google.com Records the time spent executing CookieMonster::GetCookieListWithOptions, plus its callback if the callback is invoked synchronously. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. Not reported for clients with low-resolution clocks. miketaylr@chromium.org src/net/cookies/OWNERS If a cookie's {CookieField} field contains a non-ASCII character. Informally, this indicates if the field contains a (non-ASCII) Unicode character. Logged whenever a cookie is created via CanonicalCookie::Create(). When kDisallowNonAsciiCookies is enabled and a cookie's {CookieField} field contains a non-ASCII character, this metric will not be recorded. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. miketaylr@chromium.org src/net/cookies/OWNERS The value of the effective samesite for cookies that will be included in a request. Logged once per successful inclusion. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. miketaylr@chromium.org src/net/cookies/OWNERS The value of the effective samesite for cookies that will be accepted from a response. Logged once per successful inclusion. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. dylancutler@google.com selya@google.com If a cookie line contains the Partitioned attribute, this histogram logs whether it was used correctly (must have a __Host- prefix and must not have the SameParty attribute). Logged whenever a cookie is created from a string (from a Set-Cookie header or a write to document.cookie). Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. arichiv@chromium.org kaustubhag@chromium.org Whether a cookie set via CookieMonster::SetCanonicalCookie or CookieMonster::SetAllCookies is persistent (true) or session (false). Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. morlovich@chromium.org src/net/cookies/OWNERS Recorded when a problem is recorded when loading the persistent cookie store. Value 5 was added in M96. Values 6 and 7 were added in M131. dylancutler@google.com src/net/cookies/OWNERS This histogram records the maximum sum of the sizes of the name and value of all cookies that a single domain is using. This metric is recorded every 10 minutes. dylancutler@google.com src/net/cookies/OWNERS Maximum number of SameSite=None cookies that belong to a single domain on the client. This histogram will be used to inform the per-partition-per-domain limit for partitioned cookies. Recorded every 10 minutes of active browsing time. awillia@chromium.org src/net/cookies/OWNERS Records whether or not a cookie has internal HTABs in either its name or value. Leading and trailing HTABs are ignored. This metric is recorded when CanonicalCookie::Create is called, regardless whether the cookie is successfully created or not. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. olivierli@chromium.org catan-team@chromium.org Records the number of cookie access details batches received in RenderFrameHostImpl. Recorded every time accesses are reported from the network service. kawasin@chromium.org catan-team@chromium.org Records the number of cookie access details batches received in StoragePartitionImpl::ServiceWorkerCookieAccessObserver. Recorded every time accesses are reported from CookieAccessObserver. This will be used to decide whether to optimize StoragePartitionImpl::ServiceWorkerCookieAccessObserver or not. olivierli@chromium.org catan-team@chromium.org Records the number of cookie access details received in RenderFrameHostImpl. Recorded every time accesses are reported from the network service. yoichio@chromium.org chrome-loading@chromium.org Whether a task to load cookies for a url from the backing store was posted in response to a preconnect request for the url. Recorded when kEarlyCookieLoadOnPreconnect is enabled, NetworkContext::PreconnectSockets() is called and the URLRequestContext has a cookie store. morlovich@chromium.org src/net/cookies/OWNERS Whether a site tried to set a cookie with an empty name. Recorded when creating a cookie from a parseable set-cookie string. morlovich@chromium.org src/net/cookies/OWNERS Whether a site tried to set a cookie with an empty name and a value containing =, which can result in parsing ambiguity on Cookie: headers. Recorded when creating a cookie from a parseable set-cookie string whose name is empty. chlily@chromium.org src/net/cookies/OWNERS When a cookie with empty name is successfully created via {SourceType}, this histogram logs how that cookie line came to be parsed as having an empty name. Recorded after successfully creating a cookie whose name is empty. Not recorded for a cookie line that is rejected at creation due to parsing, invalid attributes, or other errors. dylancutler@google.com src/net/cookies/OWNERS This histogram records the number of cookie jar partitions. This metric is only recorded when partitioned cookies are enabled. This count does not include the unpartitioned cookie jar. Only counts cookie jar partitions with at least one cookie. This metric is recorded every 10 minutes. dylancutler@google.com src/net/cookies/OWNERS This histogram records the number of cookies in the partitioned cookie jar. This metric is only recorded when partitioned cookies are enabled. This metric is recorded every 10 minutes. dylancutler@google.com src/net/cookies/OWNERS This histogram records the number of partitioned cookies whose partition key is {NonceType}. This metric is only recorded when partitioned cookies are enabled. This metric is recorded every 10 minutes. dylancutler@google.com src/net/cookies/OWNERS This histogram records the size of the names and values of all cookies in the partitioned cookie jar. This metric is only recorded when partitioned cookies are enabled. This metric is recorded every 10 minutes. dylancutler@google.com src/net/cookies/OWNERS This histogram records the size of the names and values of all cookies in the partitioned cookie jar, only counting {NonceType} partitions. This metric is only recorded when partitioned cookies are enabled. This metric is recorded every 10 minutes. dylancutler@google.com src/net/cookies/OWNERS This histogram records the number of partitioned cookies in requests. Only measured for requests that include at least one cookie, partitioned or not. miketaylr@chromium.org src/net/cookies/OWNERS The port of the destination for a URL omnibox navigation when the destination is localhost. Excludes navigations that are effectively reloads. Also does not take into account any redirects that destination URL may do before finally serving a page. In other words, it's the port of the first request in a possible chain. Note that the effective port is recorded which includes the default port, so if https://google.com is typed then 443 will be recorded. Cookie.Port.OmniboxURLNavigation.RemoteHost records the non-localhost version of this histogram. While the intent of this histogram is to inform cookie related design decisions, the metric itself does not depend on cookies being sent or set. miketaylr@chromium.org src/net/cookies/OWNERS The port of the destination for a URL omnibox navigation when the destination is anything but localhost. Excludes navigations that are effectively reloads. Also does not take into account any redirects that destination URL may do before finally serving a page. In other words, it's the port of the first request in a possible chain. Note that the effective port is recorded which includes the default port, so if https://google.com is typed then 443 will be recorded. Cookie.Port.OmniboxURLNavigation.Localhost records the localhost version of this histogram. While the intent of this histogram is to inform cookie related design decisions, the metric itself does not depend on cookies being sent or set. miketaylr@chromium.org src/net/cookies/OWNERS This is the port a cookie is being read by: For network access via HTTP(S) this value is the port of the origin the request is being sent to. For script access via non-HTTP APIs this is the value of the port of the origin of the frame the read call is made in. The "Localhost" variant of this metric is recorded only for localhost origns. The "RemoteHost" variant is recorded for all other origins. This metric is recorded once per included cookie on every read attempt. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. miketaylr@chromium.org src/net/cookies/OWNERS This records if a cookie is being read by the same port value that set it (the source port). See Cookie.Port.Set.* and Cookie.Port.Read.* for more information on how the port value for setting and reading (respectively) is obtained. If the source port is unspecified (due to a cookie already existing before we started to record this value) or invalid (due to corruption) then this metric does not check for destination port equivalency. The "Localhost" variant of this metric is recorded only for localhost origns. The "RemoteHost" variant is recorded for all other origins. The "DomainSet" variant of this metric is recorded for all cookies which have the Domain attribute set (localhost and IP addresses cannot set the Domain attribute and therefore will not trigger this metric. Put technically, the origin must have a non-empty registrable domain to set the Domain attribute). This metric is recorded once per included cookie on every read attempt. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. miketaylr@chromium.org src/net/cookies/OWNERS This is the port a cookie is being set by: For network access via HTTP(S) this value is the port of the origin the response is being received from. For script access via non-HTTP APIs this is the value of the port of the origin of the frame the set call is made in. The "Localhost" variant of this metric is recorded only for localhost origns. The "RemoteHost" variant is recorded for all other origins. This metric is recorded once per included cookie on every set attempt. This includes expired cookies which are immediately deleted. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. morlovich@chromium.org src/net/cookies/OWNERS The same-site context of a request, i.e. the relationship between the request and the navigational environment. Logged on every request to access a cookie. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. miketaylr@chromium.org src/net/cookies/OWNERS The value of the cookie's SameSite attribute, if any. This is logged once per created cookie, upon parsing of the SameSite attribute from a string. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. dylancutler@google.com src/net/cookies/OWNERS Size of SameSite=None cookies in bytes. Counted whenever a cookie is set via CookieMonster::SetCanonicalCookie. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. dylancutler@google.com src/net/cookies/OWNERS Size of SameSite=None {IsPartitioned} cookies in bytes. Counted whenever a cookie is set via CookieMonster::SetCanonicalCookie. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. arichiv@chromium.org src/net/cookies/OWNERS Number of hours old a non-session cookie written by a script and being loaded for some context is (for values greater than one week). Recorded when cookies are loaded from the store. arichiv@chromium.org src/net/cookies/OWNERS Number of hours old a non-session cookie written by a script and being loaded for some context is (for values less than or equal to one week). Recorded when cookies are loaded from the store. arichiv@chromium.org src/net/cookies/OWNERS Number of hours in the future a non-session cookie being set via JavaScript wants to expire (for values greater than to one week). Recorded when the cookie is stored via script. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. arichiv@chromium.org src/net/cookies/OWNERS Number of hours in the future a non-session cookie being set via JavaScript wants to expire (for values less than or equal to one week). Recorded when the cookie is stored via script. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. arichiv@chromium.org src/net/cookies/OWNERS Number of hours old a session cookie being loaded for some context is (for values greater than one week). Recorded when cookies are loaded from the store. Unlike Cookie.SessionAgeInHoursGTOneWeek this metric records the time since the last refresh (if any) instead of initial creation. arichiv@chromium.org src/net/cookies/OWNERS Number of hours old a session cookie being loaded for some context is (for values less than or equal to one week). Recorded when cookies are loaded from the store. Unlike Cookie.SessionAgeSinceLastUpdateInHoursLTEOneWeek this metric records the time since the last refresh (if any) instead of initial creation. dylancutler@google.com src/net/cookies/OWNERS This histogram records if a Set-Cookie header resulted in a partitioned or unpartitioned cookie. Only recorded if the header resulted in a valid cookie. This allows us to estimate what percentage of Set-Cookie headers contain the Partitioned attribute. arichiv@chromium.org src/net/cookies/OWNERS For each cookie added to the store, record the source that wrote it. This helps understand the balance of cookies written by HTTP Headers, JavaScript, etc. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. yoichio@chromium.org chrome-loading@google.com The amount of time taken to load cookies from the SQLite database and notify the caller. This is recorded on a background thread during the initial load of the persistent cookie store, specifically for the first time this operation is called (which is usually the full load or the first keyed load). yoichio@chromium.org chrome-loading@google.com The amount of time taken to load cookies from the SQLite database and notify the caller. This is recorded on a background thread during the initial load of the persistent cookie store. arichiv@chromium.org src/net/cookies/OWNERS Records the amount of stale (7 days since last access or update) session cookies deleted by SessionRestore after tabs have been restored on browser startup. See crbug.com/40285083 for more info. wfh@chromium.org The amount of time (ms) between the cookie store load starting and completing. arichiv@chromium.org wfh@chromium.org src/net/cookies/OWNERS The amount of time (ms) to migrate a v23 cookie database to v24. Migration occurs upon first startup of a browser version with v23 database code. cfredric@chromium.org src/net/cookies/OWNERS The amount of time (ms) to initialize the cookies database. morlovich@chromium.org src/net/cookies/OWNERS The amount of time (ms) cookie operations are blocked due to a global operation happening on startup. 0 if this didn't happen. Recorded after all cookies finished loading from disk for a given cookie store. cfredric@chromium.org src/net/cookies/OWNERS The amount of time (ms) to record periodic statistics for logging. This metric is recorded every 10 minutes. arichiv@chromium.org src/net/cookies/OWNERS For each cookie added to the store, record it's type(s). A new enumeration value, Persistent, was added in M125. Subsampled to 1/1000. See kHistogramSampleProbability in net/cookies/cookie_constants.h for details. wfh@chromium.org src/net/cookies/OWNERS The result of calling ::GetLastError if initializing the cookies database fails catastrophically. Initializing the cookies database happens once per network context configured with persistent cookies, so this metric could be reported multiple times from the same client. Catastrophic errors are defined in sql::IsErrorCatastrophic. This metric is only reported on Windows.