[CentOS] automount complaints

Folks,

   I've been getting complaints in our logfiles, such as
May 12 10:07:07 <servername> automount[3415]: update_negative_cache: key
".git" not found in map.

   a) Is there a FAQ on automount that might cover some of this? Googling
        hasn't found one for me?
   b) Any clues as to what might be causing this? I see a lot of it,
        in spurts.

       mark