Per our conversation with @jcrespo:
First, `modules/mysql` isn't used by core databases (in favor of `modules/mariadb`) and is unmaintained. It perhaps could be fully removed and replaced by the `mariadb` module), but it currently has these users in the tree:
```
hieradata/labs.yaml:mysql::server::use_apparmor: false # The images we have for debian don't support it
modules/mediawiki_singlenode/manifests/init.pp: class { '::mysql::server':
modules/quarry/manifests/database.pp: class { '::mysql::server':
modules/role/manifests/requesttracker/labs.pp: class { 'mysql::server':
modules/role/manifests/requesttracker/labs.pp: require => Class['::requesttracker', 'mysql::server'],
modules/role/manifests/simplelamp.pp: class { '::mysql::server':
modules/role/manifests/statistics/private.pp: mysql::config::client { 'statistics-private':
modules/role/manifests/wikimetrics/staging.pp: class { '::mysql::server':
modules/statistics/manifests/compute.pp: mysql::config::client { 'stats-research':
modules/statistics/manifests/discovery.pp: ::mysql::config::client { 'discovery-stats':
modules/statistics/manifests/mysql_credentials.pp: mysql::config::client { $title:
modules/statistics/manifests/wmde.pp: mysql::config::client { 'research-wmde':
```
Second, mariadb::packages_wmf and mariadb::packages should probably be merged into one.
Plus, any other cleanups that we need to do while (if?) we're repurposing the mariadb module to cover misc use cases :)