rkaplow@chromium.org chrome-metrics-team@google.com The actual interval between log upload start and previous log upload finished within the same process. A value of 0 indicates there was no previous upload. rkaplow@chromium.org chrome-metrics-team@google.com Emitted when UKM Service attempts to build and store a log. Emits true if it was empty (no sources or entries) which means no log is written, false otherwise. rkaplow@chromium.org chrome-metrics-team@google.com Logged in UpdateUkmAllowedForAllProfiles from the UkmConsentStateObserver which is called when UkmConsentStateObserver starts observing a new profile and every time a URL-keyed anonymized data collection state changes or a sync service state changes. This records whether UKM is allowed for all profiles. andrewbregger@google.com chrome-metrics-team@google.com Logged in UpdateUkmAllowedForAllProfiles from the UkmConsentStateObserver. This records if App-sync was changed everytime a profile is updated. True will be recorded when App-sync changes and false otherwise. This is to understand how often App-sync is changed. rkaplow@chromium.org chrome-metrics-team@google.com Logged in the UpdateProfileState call from the UkmConsentStateObserver. This records if the UKM allowed change will trigger a purge of the local UKM data. rkaplow@chromium.org chrome-metrics-team@google.com Number of UKM entries that are dropped. Categorized by the cause of it being dropped. jwd@chromium.org chrome-metrics-team@google.com The hashed name of the UKM entry being dropped. The hash is the same hash sent in the UKM log but truncated to 31 bits with "event_hash & 0x7fffffff". Recorded when adding an entry and the UKM recorder decides it should be dropped. lucnguyen@google.com chrome-metrics-team@google.com The hashed name of the UKM entry being dropped. The hash is the same hash sent in the UKM log but truncated to 31 bits with "event_hash & 0x7fffffff". Recorded when adding an entry and the UKM recorder decides it should be dropped due to reaching the max number of sources allowed in memory. yrsun@chromium.org chrome-metrics-team@google.com The hashed name of the UKM entry being dropped. The hash is the same hash sent in the UKM log but truncated to 31 bits with "event_hash & 0x7fffffff". Recorded when adding an entry and the UKM recorder decides it should be dropped due to the UkmRecorderImpl::ApplyEntryFilter check. lucnguyen@google.com chrome-metrics-team@google.com The hashed name of the UKM entry being dropped. The hash is the same hash sent in the UKM log but truncated to 31 bits with "event_hash & 0x7fffffff". Recorded when adding an entry and the UKM recorder decides it should be dropped due to it being sampled out. yrsun@chromium.org chrome-metrics-team@google.com The hashed name of the UKM entry being recorded. The hash is the same hash sent in the UKM log but truncated to 31 bits with "event_hash & 0x7fffffff". Recorded when an entry is added and accepted by the UKM recorder. rkaplow@chromium.org chrome-metrics-team@google.com Number of serialized UKM entries when storing a UKM log. rkaplow@chromium.org chrome-metrics-team@google.com Number of serialized UKM entries that are of type PageLoad that have the metric PaintTiming.NavigationToFirstContentfulPaint. This is recorded every time a UKM log is stored. rkaplow@chromium.org chrome-metrics-team@google.com Logged during UkmService initialization whether the init task or the initial log timer completed first. The expectation is the vast majority of the time, the init task should complete first. If metrics show otherwise, then it may indicate there's a bug in the UkmService init sequence and that it should be investigated. rkaplow@chromium.org Number of times when UKM.LogSize.OnSuccess was recorded on iOS. Recorded when the app transitions to the foreground. This histogram should help to figure out the root cause of crbug.com/1154678 (Data loss on UMA in iOS). If total count of UKM.IOSLog.OnSuccess is greater than number of UKM.LogSize.OnSuccess records, then data loss is caused by failure to write the histogram to the disk on background thread. Otherwise (if total sum of UKM.IOSLog.OnSuccess is equal to total count of UKM.LogSize.OnSuccess records) then there is actually no data loss and app simply gets terminated in a short window between UKM reached the server and the API call which records the data. rkaplow@chromium.org chrome-metrics-team@google.com Size in kilobytes (after compression) of an uploaded UKM log. Recorded after a successful UKM upload. Note: A related metric (UKM.ProtoCompressionRatio) logs the compression ratio. rkaplow@chromium.org chrome-metrics-team@google.com Logs whether a log was not uploaded due to cellular log throttling logic. Android only. rkaplow@chromium.org chrome-metrics-team@google.com HTTP response codes and network errors encountered by UKM when attempting to upload logs to the server. jwd@chromium.org rkaplow@chromium.org chrome-metrics-team@google.com The client id was migrated from an Int64 pref to a UInt64 pref. Not migrated is recorded when a valid UInt64 value is loaded from prefs. Migration started in M75. rkaplow@chromium.org chrome-metrics-team@google.com The status when loading UKM PersistedLogs from Prefs. rkaplow@chromium.org src/base/metrics/OWNERS Compression ratio of the serialized protobuf that will be uploaded to the UKM server. This serialized protobuf is compressed using gzip. See also UKM.LogSize.OnSuccess. rkaplow@chromium.org src/base/metrics/OWNERS Number of sources pruned after the operation of {Type} type. yrsun@chromium.org chrome-metrics-team@google.com Percentage that data non-directly attributed (e.g. system profile info, etc) to UKM take up in a serialized ukm::Report protocol buffer, before compression. rkaplow@chromium.org chrome-metrics-team@google.com Recorded when a UKM client state (client_id, session_id) is reset. This emits the reason the resetting was triggered. rkaplow@chromium.org chrome-metrics-team@google.com Number of UKM sources that are dropped. Categorized by the cause of it being dropped. rkaplow@chromium.org chrome-metrics-team@google.com Number of unsent UKM sources that were kept in-memory to be potentially transmitted in the next log. rkaplow@chromium.org chrome-metrics-team@google.com Number of serialized UKM sources when storing a UKM log. {UkmSourceIdTypes} rkaplow@chromium.org chrome-metrics-team@google.com Number of UKM sources that were not sent because they did not match a navigation source URL. rkaplow@chromium.org chrome-metrics-team@google.com Number of UKM sources that were not sent because they had no associated entries. rkaplow@chromium.org chrome-metrics-team@google.com Number of bytes in an excessively large log that was discarded while persisting UKM logs to disk to retry during next chrome run. rkaplow@chromium.org chrome-metrics-team@google.com Counter for number of UKM unsent logs removed from persistent storage. vincb@google.com chrome-metrics-team@google.com The status of the retrieval of user demographics from sync that are reported to UKM. Emitted each time UKM metrics are reported.