public boolean isHeapCritical(final InternalDistributedMember member) {
    ResourceManagerProfile rmp = (ResourceManagerProfile) getProfile(member);
    return rmp != null && rmp.getHeapState().isCritical();
  }
Get set of members whose {@linkplain ResourceManager#setCriticalHeapPercentage(float) critical
heap threshold} has been met or exceeded. The set does not include the local VM. The mutability
of this set only effects the elements in the set, not the state of the members.

@return a mutable set of members in the critical state otherwise {@link Collections#EMPTY_SET}
geode-core/src/main/java/org/apache/geode/internal/cache/control/ResourceAdvisor.java