What is meta? ×  I've just noticed a question migrated from SO
to which I had added a comment. The OP had replied to it, but
only his comment is now visible.  Is keeping only the OP's
comments the normal behaviour?  There were a few links/pointers
that should have been of interest for this question (I thought
they were not sufficient for a full answer), and it makes his
comment sound a bit awkward, since he's answering mine.   I've
reposted a slight variation of my initial comment. I've noticed
that the second comment had disappeared, but I'm not sure
whether the OP deleted it or if it was someone else.  The
overall question, it seems, is that when the comment contains a
link to another question (or something else) on the site where
the question is to be migrated, the comment is deleted
altogether.  I understand it makes sense to delete a comment
that says:  Voting to migrate to
[ServerFault](http://serverfault.com/)  but not:  Voting to
migrate to ServerFault. By the way, this is similar to
http://serverfaul