Battlemetrics does not list a "Warn Player" command for Squad 44. However, the game's RCON provides an
AdminWarn
AdminWarn
command which behaves the same as it does in Squad and Beyond The Wire. Right now we have to add a player action trigger that runs a raw command to warn players.
Solution
Okay I take that back, apparently it only works via the in-game console but not via RCON