private void notifyMembersForRefreshIntervalChange(long newInterval) {
    GfManagerAgent agent = getGfManagerAgent();
    ApplicationVM[] VMs = agent.listApplications();
    // TODO: is there any other way to get all VMs?

    for (final ApplicationVM vm : VMs) {
      vm.setRefreshInterval(newInterval);
    }
  }
An intermediate method to notify all members for change in refresh interval.

@param newInterval refresh interval to be set for members(in milliseconds)
geode-core/src/main/java/org/apache/geode/admin/jmx/internal/AdminDistributedSystemJmxImpl.java