As @Viccroy stated on Discord, it can also be used to shutdown the server, allowing players to see the shutdown warning in-game.
This -of course- is just one of a possible use.
[ ] Build the containers with this interface enabled (if needed).
[ ] Expose the port (if needed).
[ ] Make credentials configurable via environmental variables.
CMaNGOS comes with a SOAP interface that can be used to execute server commands remotely.
Here's a basic usage example: https://github.com/cmangos/mangos-tbc/blob/f0e5bdc4d1cf53ffeeb1142b5f7290b464b9984a/contrib/soap/example.php
As @Viccroy stated on Discord, it can also be used to shutdown the server, allowing players to see the shutdown warning in-game.
This -of course- is just one of a possible use.