How to send message to all online users from administer

It is now possible to properly divide players who have multiple current dedicated servers, but I want to send message for all new online players, for example, I want to send “server maintenance from one minute after” from server administrator, moreover I want to Most of us want to get the number of players online, but now we can do it if we can do above.

My idea is to connect everyone to one Dedicated Server right after launching the app, and I think what happens from here, but I do not know how to send anything (text or UI) from this side, and that Other than I may be able to endure with one Dedicated Server.

I’m glad to only teach if there is a way to manage multiple servers dedicated to multiple plays at once as knowledge, rather than using it over time. (All the servers together, this server as well as send processing all together)

I have two questions, so I’m glad if I could tell if there was a possibility.

sorry from google translator and my a little bit knowledge.