[-] On CentOS 7 x64 servers, after installing MariaDB version 10 or 10.1 the MySQL component was marked as “not installed” in the Plesk Installer. (PPP-18000)
So i was confused, if MariaDB 10.1 is supported or not.
as long as Odin doesn't state clear in the "Supported Third-Party Components" documentation:, that the mentioned third party component is supported, they mostly are still testing or consider to test.