galera-formula/galera/files/collectd_mysql.conf

<LoadPlugin mysql>
  Globals false
</LoadPlugin>

<Plugin mysql>
    <Database "mysql">
        Host "localhost"
        Socket "{{ plugin.socket }}"
        User "{{ plugin.username }}"
        Password "{{ plugin.password }}"
        MasterStats false
        SlaveStats false
    </Database>
</Plugin>