/etc/logrotate.d/psaccu_atop is in atop 2.3.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | # Logrotate file to take action after psacct is rotated
/var/log/atop/dummy_after {
    missingok
    daily
    rotate 0
    nomail
    nocompress
    ifempty
    create 0600 root root
    postrotate
	if [ -e /etc/logrotate.d/psacct ]
	then
	    # if the atop daemon does not run, restart it after
	    # accounting file is rotated
	    PIDFILE=/run/atop.pid
	    if [ -e $PIDFILE ] && \
			ps -p `cat $PIDFILE` | grep 'atop$' > /dev/null
	    then
	        :
	    else
	        /usr/share/atop/atop.daily&
	    fi
	fi
    endscript
}     
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