PUBLIC MARKS from nhoizey with tag qos

acceptable levels of tolerance differ depending on whether or not a given operation is safe or not

it is actually not up to the server to purely dictate a straight process and response to the consumer it is up to the consumer and producer to negotiate the right result for both parties a QoS policy that assumes that the producer is the final arbiter of quality is liable to produce a very unfriendly service and one which doesn't interact with people in the manner which they wish