I see you mention circuit breakers. I think they deserve more thorough coverage because 1) you really need them in a lot of applications, and 2) they're not in

I see you mention circuit breakers. I think they deserve more thorough coverage because 1) you really need them in a lot of applications, and 2) they're not in OTP, so picking one (especially if you're not really an Erlang expert) and employing it in the right way are a bit trickier. A simple example of an application that probably needs a circuit breaker is a web application that can keep running even if the database is not available, even if all it does is return an error message to the browser.