Is there a minimal participation that moderators on a Stack Exchange 2.0 site are supposed to have on the meta site associated to the site they are moderating? I am not referring to Stack Exchange staff, but to appointed moderators and moderators that have been elected on any of the Stack Exchange site that are not part of the trilogy.
I have noticed that in some sites, the moderators answer questions on the meta site, while in other cases, the moderators barely answer any question on the meta site, with the exception of requests to merge accounts.
While I understand that always having an answer from a moderator could have the effect of stopping other users from answering those questions, especially on sites with a restricted number of frequent visitors, I also think that moderators that never reply to questions about why they closed a question, or why the flag about an answer that is not really an answer was rejected, don't participate to the meta site enough.
Is there any requirement for the moderators' participation to the meta site? What is the limit between non participating, and participating too few?
What about the participation to Meta Stack Overflow? Are moderators supposed to have a minimal knowledge of what is suggested on Meta Stack Overflow for some of the basic (or less basic) operations done from a user (e.g. flag two user accounts from merging, flag all the comments of an answer as obsolete) and the preferred way to do it (e.g. flag the post created from one of the account, and report the account should be merged with another one; flag the post to which the comments are referring, and report that those comments are all off-topic/too chatty)?