public boolean notifiesSerialGatewaySender() {
    if (isPdxTypesRegion()) {
      return false;
    }
    Set<String> allGatewaySenderIds = getAllGatewaySenderIds();
    if (!allGatewaySenderIds.isEmpty()) {
      for (GatewaySender sender : getCache().getAllGatewaySenders()) {
        if (allGatewaySenderIds.contains(sender.getId())) {
          if (!sender.isParallel()) {
            return true;
          }
        }
      }
    }
    return false;
  }
Returns true if this region notifies any serial gateway senders including internal async event
queues.
geode-core/src/main/java/org/apache/geode/internal/cache/LocalRegion.java