# m h    dom   mon   dow   user   command
  0 */12 *     *     *     root   test -x /usr/bin/certbot -a \! -d /run/systemd/system && perl -e 'sleep int(rand(3600))' && certbot -q renew --pre-hook /var/lib/stop-services.sh --renew-hook /var/lib/certbot-renew.sh --post-hook /var/lib/stop-services.sh