Aliases for vhosts subdomains
after 3 years ( issue #2989 (closed) ) ..... I think is interesting reopen this issue. The reason to evaluate this ( alias for vhost subdomains ) is related to the HTTPS needings .
It's ok , it is possibile to create and alias of the thirdlevel simply ading serveralias in the Apache option field , but if you wish / want to use letsencrypt in 3^ level the certificate is not issued for the "hardcoded" alias .