public function hasAssignedAlarms($instanceIds)
 {
     $result = $this->client->describeAlarmsForMetric(array('MetricName' => 'CPUUtilization', 'Namespace' => $this->getNamespace(), 'Dimensions' => $this->getDimensions($instanceIds)));
     $metricAlarms = $result->getPath('MetricAlarms');
     return !empty($metricAlarms);
 }