Description of AMQ_DATA_DIR_LOGGING is not correct. It is boolean parameter if true(default) than it causes the logging.properties to set the logging directory to be in the mounted persistent volume in the same directory as the journal etc. If flase than logging will be ephemeral.

[1] https://access.redhat.com/documentation/en-us/red_hat_amq/7.5/html-single/deploying_amq_broker_on_openshift/index#app-template-params_broker-ocp