I use Website auto alias in ISPConfig and I've found that search engines are indexing domain aliases. This is not desired status. So I decided to use X-Robots-Tag HTTP header (more info on developers.google.com
for example). When you have in Website auto alias for example:
so you can put this directive to apache directive settings:
# Prevent search engine indexing on temporary domain sites:
SetEnvIf Host test\.domain\.ltd$ temporary_domain
Header set X-Robots-Tag "noindex, nofollow" env=temporary_domain
Apache mod headers and mod setenvif has to be activated for properly work.
It would be nice if this functioin was included in ISPConfig directly as optional