Chapter 3 of Erlang in Anger (<a href="http:&#x2F;&#x2F;www.erlang-in-anger.com&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.erlang-in-anger.com&#x2F;</a>) does mention them among other strategies in handling overload (3.2.2). I tried to put as much concise production experience as I could into that manual. Hopefully it proves helpful!