FYI, we are moving to using the Hotlist-Metrics label for tracking bugs related to individual metrics, and reserving Internals>Metrics>UMA for core metrics library/team work.

isherman@ is there a corresponding component for this? reason I'm asking is because these end up in untriaged bucked during UI triage, if no component assigned. 

Fletcher might be a good candidate to look at this. I'm hoping that we can work through some pending metrics and reporting bugs.

Sure, I'm happy to offer guidance.

That this should probably be reported by Chrome, possibly by chrome/browser/chromeos/power/power_metrics_reporter.cc. You may need to observe code within //content in order to hear about <video> content. It may make sense to additionally implement services/viz/public/interfaces/compositing/video_detector_observer.mojom to learn about compositor-detected video activity.