Daily from ytterbium, neon and strontium:
Cron Daemon root@strontium.eqiad.wmnet via wikimedia.org to root /etc/cron.daily/logrotate: [Thu Apr 14 06:25:46 2016] [warn] NameVirtualHost *:80 has no VirtualHosts etc/cron.daily/logrotate: [Thu Apr 14 06:25:11 2016] [warn] NameVirtualHost *:443 has no VirtualHosts [Thu Apr 14 06:25:11 2016] [warn] NameVirtualHost *:80 has no VirtualHosts [Thu Apr 14 06:25:11 2016] [warn] NameVirtualHost *:80 has no VirtualHosts
Explained in https://wiki.apache.org/httpd/CommonMisconfigurations#Using_the_same_Listen_and.2For_NameVirtualHost_multiple_times.
The httpd config has multiple NameVirtualHost *:80 in the sites-enabled triggering the warning. Also the stretch goal would be to move to http 2.4 + mpm_event.