Comment flags do not show who did the flagging, which is usually fine -- as a moderator reviewing such flags I can evaluate whether something is "not constructive" or "too chatty" or "offensive" without knowing the history. But "obsolete" flags require more work, enough that when I see them I usually heave a hearty sigh, take a look, and then go do something else in hopes that some other moderator will untangle the mess. That's not ideal, especially as they're doing the same thing to me. And nobody else sees these flags, so the community can't help.
Here's what happens: a post garners, say, 10 comments and a subsequent edit, and now, say, 3 of those comments have been flagged as obsolete. Does that mean they were questions that have been answered in the edit? Now I have to go review the edit and compare it to the comments to try to figure that out -- and also decide if any other comments are also obsolete, because you can't flag your own comments and the flagger might have only flagged the other side of a conversation. (And he didn't just delete his comments because, with the others still there, he'd be leaving a hole.) If I know that the flag came from the person who made the edit, though, then I'd be more likely to just trust the flag and not check his work closely. (At least if the user has some rep on the site or is known to me.)
Or maybe they're obsolete because their primary purpose was to ping somebody -- "@so-and-so, see my edit". In that case if the flag is coming from so-and-so then it's definitely obsolete (he's seen it), but if it's coming from somebody else it might just be zeal. So I have to guess -- the comment was left an hour ago, so-and-so was here 30 minutes ago so might have seen it... or might have visited some other page on the site and hasn't picked up his pings yet because he's reading from his network-flaky commuter rail.
Or maybe they're obsolete because two people have been having a conversation in comments and somebody else is pointing out that "hey, he responded to this comment and nobody else cares, so you can delete that now". Or maybe somebody is using "obsolete" where he should be using "not constructive", because to some users "obsolete" means "make it stop already". (Yes, I've seen this.)
Or -- and we prefer not to think ill of users, but... -- is that "obsolete" flag coming from somebody who disagrees with a point raised in a comment and wants to just delete it? Now we're back to trying to figure out if the point was valid, if it was addressed in an edit, if it was later retracted, or what.
Moderators aren't supposed to be the content police. We're knowledgeable in the topics of our sites, of course, but that doesn't mean we have the expertise to judge every single case. I've sometimes investigated "obsolete" flags and still left them for someone else because, after review, I still can't tell, because it's about some arcane point that I don't understand.
How do we fix this? While it wouldn't be a complete solution, telling us who left the flag would help in several of these cases, and shouldn't be a hard change. Could you please identify the flagger on, at least, obsolete-comment flags? If it's easier to just do it for all comment flags that's fine too, but it's the obsolete flags that are driving this request.
In an ideal world we'd make bigger changes to comment-handling, but it'll take a while to figure out and then implement that. In the meantime, so long as mods are the only ones who can handle these flags, could we please have this additional hint?