what's `/etc/mysql/mariadb.cnf` used for? (i.e. `my.cnf` vs `mariadb.cnf`)

I'm trying to better understand how MariaDB is configured. From mysqld --help --verbose I can see that my mariadb server daemon uses /etc/mysql/my.cnf. But I'm curious about the **/etc/mysql/mariadb.cnf** file, and what it's intended for? It has almost nothing in it compared to my.cnf. ---------- The package **mysql-common** installs **my.cnf** The package **mariadb-common** installs **mariadb.cnf** ---------- On my Debian Buster system /etc/mysql/my.cnf and /etc/mysql/mariadb.cnf are similar in what they 'include'. One minor difference is that because /etc/mysql/conf.d/mariadb.cnf already includes /etc/mysql/mariadb.conf.d, /etc/mysql/mariadb.cnf seems to include /etc/mysql/mariadb.conf.d twice. my.cnf is full of options, and mariadb.cnf has little to no content, so doesn't appear to be a replacement to my.cnf, at least not yet. ---------- /etc/mysql/my.cnf --!includedir--> conf.d /etc/mysql/conf.d/mariadb.cnf --!includedir--> mariadb.conf.d /etc/mysql/mariadb.conf.d/ ... ---------- /etc/mysql/mariadb.cnf --!includedir--> conf.d AND mariadb.conf.d /etc/mysql/conf.d/mariadb.cnf --!includedir--> mariadb.conf.d /etc/mysql/mariadb.conf.d/ /etc/mysql/mariadb.conf.d/ (duplicate load) ... ----------