yaoxia@chromium.org jkarlin@chromium.org Records the action type of the request. Recorded when a topics request is handled in `BrowsingTopicsService`. Redirects (for fetch and xhr) will be counted as separate histogram entries. yaoxia@chromium.org jkarlin@chromium.org Records the load finish status of BrowsingTopicsState. Recored when the state is loaded from the file at the start of each browser session. yaoxia@chromium.org jkarlin@chromium.org Records the browsing topics calculation result status (i.e. success, or the failure reason). Recored at the end of each (weekly) topics calculation. yaoxia@chromium.org jkarlin@chromium.org Records the count of distinct history hosts that are eligible for topics calculation. Recorded during each (weekly) topics calculation after the observation domains are derived. In case of a calculation failure (e.g. permission denied, etc.), this metric won't be recorded. yaoxia@chromium.org jkarlin@chromium.org Records the count of topics derived from history hosts in the past epoch (week). Recorded during each (weekly) topics calculation after the top topics are derived. In case of a calculation failure (e.g. permission denied, etc.), this metric won't be recorded. yaoxia@chromium.org jkarlin@chromium.org Records the count of context domains for each of the calculated top topics. This won't exceed the cap number `kBrowsingTopicsMaxNumberOfApiUsageContextDomainsToKeepPerTopic`. Recorded once for each calculated top topics, during each (weekly) topics calculation after the observation domains are derived. In case of a calculation failure (e.g. permission denied; candidate topic was blocked; etc.), this metric won't be recorded. abigailkatcoff@chromium.org yaoxia@chromium.org jkarlin@chromium.org Records the time between top topic calculations. Recorded when a topic calculation finishes and results from a prior epoch are available. This metric is recorded even in case of a calculation failure (e.g. permission denied, etc.). yaoxia@chromium.org jkarlin@chromium.org Records the count of derived top topics before random ones are padded. Recorded during each (weekly) topics calculation after the top topics are derived. In case of a calculation failure (e.g. permission denied, etc.), this metric won't be recorded. yaoxia@chromium.org jkarlin@chromium.org Records the time it takes for document.browsingTopics() to resolve. Recorded each time the promise is resolved. robertogden@chromium.org yaoxia@chromium.org jkarlin@chromium.org The result of a single attempt to load the override list from disk, and parse it into a native object. Recorded once for every attempted load. Note that if an attempt fails it will not be re-attempted for the same file until the next browsing session, but a successful load will be recorded one or more times during a browsing session. robertogden@chromium.org yaoxia@chromium.org jkarlin@chromium.org When the override list is checked, whether it contained the given input. yaoxia@chromium.org jkarlin@chromium.org When retrieving topics is a success, the number of those topics that were returned (weren't filtered) that were fake (noised). yaoxia@chromium.org jkarlin@chromium.org When retrieving topics is a success, the number of those topics that were not returned because they were filtered due to the caller not having observed the user on a site about that topic recently. yaoxia@chromium.org jkarlin@chromium.org When retrieving topics is a success, the number of those topics that were returned (weren't filtered) that were real topics (as opposed to noised). yaoxia@chromium.org jkarlin@chromium.org Records the result of attempts to retrieve the user's Topics (either via javascript or headers). The result is either success or an error. yaoxia@chromium.org jkarlin@chromium.org Records initialization status of BrowsingTopics SiteDataStorage database. Recored when the database is lazily initialised when the first operation is encountered.