/var/log/atop/atop_[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9] {
    missingok
    daily
    nodateext
    rotate 1
    ifempty
    nocreate
    postrotate
      /usr/bin/find /var/log/atop/ -maxdepth 1 -mount -name atop_\[0-9\]\[0-9\]\[0-9\]\[0-9\]\[0-9\]\[0-9\]\[0-9\]\[0-9\]\* -mtime +40 -exec /bin/rm {} \;
    endscript
}