/var/log/unattended-upgrades/unattended-upgrades.log 
/var/log/unattended-upgrades/unattended-upgrades-dpkg.log
/var/log/unattended-upgrades/unattended-upgrades-shutdown.log
{
  rotate 6
  monthly
  # unattended-upgrades keeps the log file open while running so there
  # is a race here when rotating mid-run. copytruncate keeps the original
  # fd open so u-u can keep writing
  copytruncate
  compress
  missingok
  notifempty
}
