Be advised that the mariadb developers have had a brain fart! The minimum number of connections has been set at 10, which stops it being used in a "low" RAM setup unless measures are taken that limit its' performance (less cache/buffers).
CWP developers, please leave the default at mariadb 10.3, with only an option to upgrade to 10.4
(I had to revert to mySQL 5.7 on one low RAM VPS.)