@Override
  public void toData(DataOutput out,
      SerializationContext context) throws IOException {
    super.toData(out, context);
    DataSerializer.writeObject(regionStatistics, out);
  }
Returns a <code>RegionStatisticsResponse</code> that will be returned to the specified
recipient. The message will contains a copy of the local manager's system config.
geode-core/src/main/java/org/apache/geode/internal/admin/remote/RegionStatisticsResponse.java