@VisibleForTesting
  void logProxyAlreadyRemoved(DistributedMember member, Entry<String, Object> entry) {
    logger.warn("Proxy for entry {} and member {} has already been removed", entry,
        member.getId());
  }
This will return the last updated time of the proxyMBean

@param objectName {@link ObjectName} of the MBean
@return last updated time of the proxy
geode-core/src/main/java/org/apache/geode/management/internal/MBeanProxyFactory.java