I've seen a few histograms that intentionally omitted the units, like site engagement histograms where the units are kind of an abstract engagement score.  Do we want to require histograms like this to also specify a unit?

I kind of feel so. I don't mind something like "engagement score" in that case.

I don't really feel that strongly in this case. However I dislike it when there's no unit at all when there clearly should be one ... so I think requiring unit or enum seems better overall.

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Still relevant.

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot