The stacks command de-dups stack counter reports based on their hash. A GitHub issue search looks for this hash in the first comment attached to an issue ("in:body"). So, when triaging reports one must edit the first comment and append the new stack.

It would be more convenient (and easier to see the timeline) if we could simply copy the stack into a new comment, but this won't show up in the issues search. We could remove the in:body restriction, but extra work is required to fetch all the comment bodies for an issue: in principle there may be hundreds, so only the first is returned "for free".

Alternatively we could just stick with having to modify the first comment.