private RegionMXBean awaitRegionMXBeanProxy(final ObjectName objectName) {
    SystemManagementService service = getSystemManagementService();

    await()
        .untilAsserted(
            () -> assertThat(service.getMBeanProxy(objectName, RegionMXBean.class)).isNotNull());

    return service.getMBeanProxy(objectName, RegionMXBean.class);
  }
Add a Notification listener to DistributedSystemMBean which should gather all the notifications
which are propagated through all individual MemberMBeans Hence Region created/destroyed should
be visible to this listener
geode-core/src/distributedTest/java/org/apache/geode/management/RegionManagementDUnitTest.java