private Set<InternalDistributedMember> getOtherNormalMembers() {
    return cache.getDistributionManager().getOtherNormalDistributionManagerIds();
  }
Distributed tests for {@link DistributedSystemMXBean} notifications.

<pre>
a) Concurrently modify proxy list by removing member and accessing the distributed system MBean
b) Aggregate Operations like shutDownAll
c) Member level operations like fetchJVMMetrics()
d ) Statistics
</pre>
geode-core/src/distributedTest/java/org/apache/geode/management/DistributedSystemMXBeanDistributedTest.java