11. The system according to claim 9 , wherein the feedback regarding the sending of the published message from the message broker to the each of the at least one selected subscriber comprises a count of the at least one selected subscriber to which the published message is sent.
9. A system for message publication feedback in a publish/subscribe messaging environment, comprising: a computer comprising a processor; and instructions which are executable, using the processor, to implement functions comprising: receiving, at a message broker, a message published by a message publisher, the message having associated therewith a topic; selecting, by the message broker from a plurality of registered message subscribers that have registered subscriptions with the message broker to receive published messages, each subscription specifying a topic and an importance level for receiving published messages having the registered topic associated therewith, at least one subscriber for which the registered topic matches the topic associated with the published message; sending the published message from the message broker to each of the at least one selected subscriber; forwarding the published message, by the message broker, to each of at least one additional message broker to which the message broker is communicably coupled in a cluster environment, each additional message broker having a plurality of registered message subscribers that have registered subscriptions therewith to receive published messages, each registered subscription specifying a topic and an importance level for receiving published messages having the registered topic associated therewith; receiving, at the message broker from each of the at least one additional message brokers, feedback regarding sending of the forwarded message by the additional message broker to selected ones of the subscribers registered therewith responsive to the registered topic matching the topic associated with the forwarded message; and consolidating the feedback received from each of the at least one additional message brokers with feedback regarding the sending of the published message from the message broker to the each of the at least one selected subscriber; and sending, from the message broker to the message publisher, the consolidated feedback.