# File lib/acw/right_acw_interface.rb, line 143
    def get_metric_statistics(options={})
      # Period (60 sec by default)
      period = (options[:period] && options[:period].to_i) || 60
      # Statistics ('Average' by default)
      statistics = Array(options[:statistics]).flatten
      statistics = statistics.blank? ? ['Average'] : statistics.map{|statistic| statistic.to_s.capitalize }
      # Times (5.min.ago up to now by default)
      start_time = options[:start_time] || (Time.now.utc - 5*60)
      start_time = start_time.utc.strftime("%Y-%m-%dT%H:%M:%S+00:00") if start_time.is_a?(Time)
      end_time = options[:end_time] || Time.now.utc
      end_time = end_time.utc.strftime("%Y-%m-%dT%H:%M:%S+00:00") if end_time.is_a?(Time)
      # Measure name
      measure_name = options[:measure_name] || 'CPUUtilization'
      # Dimentions (a hash, empty by default)
      dimentions = options[:dimentions] || {}
      #
      request_hash = { 'Period'      => period,
                       'StartTime'   => start_time,
                       'EndTime'     => end_time,
                       'MeasureName' => measure_name }
      request_hash['Unit']       = options[:unit]        if options[:unit]
      request_hash['CustomUnit'] = options[:custom_unit] if options[:custom_unit]
      request_hash['Namespace']  = options[:namespace]   if options[:namespace]
      request_hash.merge!(amazonize_list('Statistics.member', statistics))
      # dimentions
      dim = []
      dimentions.each do |key, values|
        Array(values).each { |value|  dim << [key, value] }
      end
      request_hash.merge!(amazonize_list(['Dimensions.member.?.Name', 'Dimensions.member.?.Value'], dim))
      #
      link = generate_request("GetMetricStatistics", request_hash)
      request_info(link, GetMetricStatisticsParser.new(:logger => @logger))
    end