code: def describe_alarms_for_metric(self, metric_name, namespace, period=None,
                                     statistic=None, dimensions=None, unit=None):
          
          params = {'MetricName' : metric_name,
                    'Namespace' : namespace}
          if period:
              params['Period'] = period
          if statistic:
              params['Statistic'] = statistic
          if dimensions:
              self.build_dimension_param(dimensions, params)
          if unit:
              params['Unit'] = unit
          return self.get_list('DescribeAlarmsForMetric', params,
                               [('member', MetricAlarm)])
docs: Retrieves all alarms for a single metric. Specify a statistic, period,
          or unit to filter the set of alarms further.
  
          :type metric_name: string
          :param metric_name: The name of the metric
  
          :type namespace: string
          :param namespace: The namespace of the metric.
  
          :type period: int
          :param period: The period in seconds over which the statistic
                         is applied.
  
          :type statistic: string
          :param statistic: The statistic for the metric.
  
          :param dimension_filters: A dictionary containing name/value pairs
                                    that will be used to filter the results.
                                    The key in the dictionary is the name of
                                    a Dimension.  The value in the dictionary
                                    is either a scalar value of that Dimension
                                    name that you want to filter on, a list
                                    of values to filter on or None if
                                    you want all metrics with that Dimension name.
  
          :type unit: string
  
          :rtype list