@Override
  public void fromData(DataInput in,
      DeserializationContext context) throws IOException, ClassNotFoundException {
    super.fromData(in, context);
    _actionCode = in.readByte();
    _alertDefinitions = (StatAlertDefinition[]) DataSerializer.readObjectArray(in);
  }
Returns a <code>FetchHostRequest</code> to be sent to the specified recipient.

@param alertDefs an array of stat alert definitions to set
@param actionCode either of ADD_ALERT_DEFINITION, UPDATE_ALERT_DEFINITION,
       REMOVE_ALERT_DEFINITION
geode-core/src/main/java/org/apache/geode/internal/admin/remote/UpdateAlertDefinitionMessage.java