Seems to have returned.  Looks like sl-security repo.

repodata/updateinfo.xml.bz2 timestamp goes from 1472831996 to 1472837835.89.
Looks like the floating point issue.  Some tool is writing bad timestamps.


/etc/cron.daily/0yum-daily.cron:

Not using downloaded repomd.xml because it is older than what we have:
  Current   : Fri Sep  2 09:59:56 2016
  Downloaded: Fri Sep  2 09:59:55 2016