I guess this is fair criticism given the FAQ, but many features have been added over time. Setting up a monitor socket allows you to observe pretty much any ev

I guess this is fair criticism given the FAQ, but many features have been added over time. Setting up a monitor socket allows you to observe pretty much any event you could care about, like peer connect/disconnect/errors, etc. There is also a draft feature to access the number of queued incoming/outgoing messages (see https://github.com/zeromq/libzmq/blob/master/doc/zmq_socket_monitor_versioned.txt https://github.com/zeromq/libzmq/blob/master/doc/zmq_socket_... for details).