/usr/sbin/mariadbd would have been started with the following arguments:
--socket=/run/mysqld/mysqld.sock --pid-file=/run/mysqld/mysqld.pid --basedir=/usr --bind-address=127.0.0.1 --expire_logs_days=10 --character-set-server=utf8mb4 --character-set-collations=utf8mb4=uca1400_ai_ci