public function unmonitorInstances(ListDataType $instanceIdList)
{
$result = null;
$options = $instanceIdList->getQueryArrayBare('InstanceId');
$action = ucfirst(__FUNCTION__);
$response = $this->client->call($action, $options);
if ($response->getError() === false) {
$sxml = simplexml_load_string($response->getRawContent());
$response = null;
$result = $this->_loadListByName('MonitorInstancesResponseSet', $sxml->instancesSet);
}
return $result;
}