• The BIND DNS server has already been deprecated and removed from Plesk for Windows.
    If a Plesk for Windows server is still using BIND, the upgrade to Plesk Obsidian 18.0.70 will be unavailable until the administrator switches the DNS server to Microsoft DNS. We strongly recommend transitioning to Microsoft DNS within the next 6 weeks, before the Plesk 18.0.70 release.
  • The Horde component is removed from Plesk Installer. We recommend switching to another webmail software supported in Plesk.

Ruby On Rails Installation Instruction for Plesk 12 on Centos

Both articles are the most official sources you can have by now. One comes from the development team and another one from Parallels launch partner.
Stock Plesk guides don't cover such topics

Regards
 
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