@Override
  public void toData(DataOutput out,
      SerializationContext context) throws IOException {
    super.toData(out, context);
    InternalDataSerializer.invokeToData(load, out);
    InternalDataSerializer.invokeToData(location, out);
    DataSerializer.writeArrayList(clientIds, out);
  }
A message from a server to a locator to update the locator with new load information from the
server. Also includes the id of any clients whose estimate is no longer needed on the
server-locator.

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