What works automatically
Player#getUniqueIdand%player_name%keep working behind Velocity and BungeeCord — Paper forwards the real UUID and name to the backend.{world}and[coords]placeholders resolve on the backend the player is currently on.
What is per-server
Private messages, offline messages, ignore lists, and DND state are per backend server. A player connected to server A cannot/msg a player on server B. For cross-server chat, use a proxy-side solution or the planned DiscordSRV bridge.
Auto-broadcasts
The update checker, faststats.dev metrics, and the auto-broadcast scheduler run once per backend instance. Disable auto-broadcast on all but one server if you run a network and do not want duplicated announcements.DiscordSRV
When DiscordSRV is installed at startup, hChat logs a confirmation and reserves the integration for the upcoming chat bridge. Forwarding of/msg and /broadcast to Discord is not implemented yet — see ROADMAP.md for the planned bridge.