AMQ 7 uses the producerWindowSize parameter to determine the amount of bytes that can be in-flight at any one time [1]. The broker doc mentions this parameter but only in the context of clusters [2].

It might be good to mention this in the Broker doc in discussion around around flow control as well as client docs to show how this parameter is configured on the client.

[1] https://activemq.apache.org/artemis/docs/2.1.0/flow-control.html
[2] https://access.redhat.com/documentation/en-us/red_hat_jboss_amq/7.0/html/using_amq_broker/cluster_connection_elements