First, do you really need stickyness.
If the answer is yes, then do you really want to break stickyness when the server is too busy ?
Because that's the only solution...the CSS can't queue the request and wait for the server.
So, I'm not sure what you mean by load reporting, but something you can do is find out how many questions the server can handle correctly and set the maxconn command. That will bring the server down on the CSS when before it gets too busy.
But it will break stickyness.
Gilles.