@Override
    public void afterUnregisterInterest(InterestRegistrationEvent event) {
      LogWriterUtils.getLogWriter()
          .info("InterestListener.afterUnregisterInterest invoked with this event: " + event);
      unregistrationCount++;
    }
unregister a key for a particular client in the server

@param clientId the client's ID
@param key the key it's no longer interest in
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/tier/sockets/InterestListDUnitTest.java