UMA metrics in DevTools frontend

(Googlers only) Generally, the histogram or action data is available in the Timeline category of the UMA page.

• Select the channel you want to dive into.
• Select the platforms you are interested in (for us, it is Linux, MacOS, Windows, ChromeOS and Lacros)
• Add the metric you want to see, for example the generic histogram for action tracking, DevTools.ActionTaken.

General histograms

• DevTools.ActionTaken is a generic histogram for tracking actions performed via the DevTools front-end.
• DevTools.PanelShown counts how often a given panel or tab is shown in the DevTools front-end.

Histograms for the Workspaces feature

• DevTools.ActionTaken records AddFileSystemToWorkspace (Add Filesystem to Workspace), RemoveFileSystemFromWorkspace (Remove Filesystem from Workspace) and FileSystemSourceSelected (Filesystem source selected) according to developer interactions with the Filesystem tab in the Sources panels sidebar.
• DevTools.Workspaces.PopulateWallClockTime records the wall clock time in milliseconds elapsed while populating a project folder in the workspace.
• DevTools.SidebarPaneShown records the navigator-files (Sources - Filesystem) enum whenever the Filesystem tab is revealed in the Sources panels sidebar.