OpenStack has been mentioned here a few times which caught my eye.

Our DBA (is that still a thing most places?) has requested that we prefer Percona over MariaDB in future infrastructure roll outs. I'm currently wrestling with Percona and it seems to be a confusing mess to me. Admittedly, I'm only a casual database consumer, but I've never had problems like this with postgres

  ERROR! mysql pid file /run/mysqld/mysql.pid /var/run/mariadb/mariadb.pid empty or not readable

Installation has been a pain with conflicting/incompatible versions of galera. I just want a simple ha database; is that so much to ask for?