Contrary to the question closed popup, the revisions list does include information about somebody using a dupehammer to close a question. However, it's badly formatted; it looks as if the tag name is part of the username (even though it does link to the corresponding tag badge page):
When (if?) development on the apps ever resumes (whether in-house or open source), can this be changed so that it looks like a tag badge, as it does on the website?