https://access.redhat.com/documentation/en-us/red_hat_amq/2020.q4/html-single/deploying_amq_broker_on_openshift/index#proc_br-monitoring-broker_broker-ocp describes how to monitor using the Jolokia REST interface to JMX.

but a prerequisite is that you've deployed using templates. Need to update now that templates are no longer supported.