17.Warning function for traffic overload

ProudNet : Server and Network dectects overloaded traffic if it too much than network speed. Once it dectects overloaded traffic, it will notice it to you.

Proud.INetCoreEvent.OnWarning will callback that include Proud.ErrorType_SendQueueIsHeavy.

If traffic is too much, we suggest improving unnessesary messaging or doing 11. Traffic auto-control function (Throttling).