Got it.
Ubuntu-1604-xenial-64-minimal:~# systemctl status apache2.service
β apache2.service - LSB: Apache2 web server
Loaded: loaded (/etc/init.d/apache2; bad; vendor preset: enabled)
Drop-In: /lib/systemd/system/apache2.service.d
ββapache2-systemd.conf
Active: active (running) since Sun 2019-08-11 21:14:18 CEST; 6min ago
Docs: man:systemd-sysv-generator(8)
Process: 1022 ExecStart=/etc/init.d/apache2 start (code=exited, status=0/SUCCESS)
CGroup: /system.slice/apache2.service
ββ1132 /usr/sbin/apache2 -k start
ββ1135 /usr/sbin/fcgi-pm -k start
ββ1137 /usr/sbin/apache2 -k start
ββ1138 /usr/sbin/apache2 -k start
ββ1139 /usr/sbin/apache2 -k start
ββ1140 /usr/sbin/apache2 -k start
ββ1141 /usr/sbin/apache2 -k start
Aug 11 21:14:14 Ubuntu-1604-xenial-64-minimal apache2[1022]: * Starting Apache httpd web server apache2
Aug 11 21:14:13 Ubuntu-1604-xenial-64-minimal systemd[1]: Starting LSB: Apache2 web serverβ¦
Aug 11 21:14:17 Ubuntu-1604-xenial-64-minimal apache2[1022]: [Sun Aug 11 21:14:17.752933 2019] [so:warn] [pid 113
Aug 11 21:14:17 Ubuntu-1604-xenial-64-minimal apache2[1022]: AH00558: apache2: Could not reliably determine the s
Aug 11 21:14:18 Ubuntu-1604-xenial-64-minimal apache2[1022]: *
Aug 11 21:14:18 Ubuntu-1604-xenial-64-minimal systemd[1]: Started LSB: Apache2 web server.