@Override
  public void queueAdded(ClientProxyMembershipID id) {
    synchronized (clientIds) {
      metrics.incQueueCount();
      clientIds.add(id);
    }
  }
Keeps track of the clients that have added a queue since the last load was sent to the
server-locator.

@since GemFire 5.7
geode-core/src/main/java/org/apache/geode/cache/server/internal/LoadMonitor.java