def monthly(stack_id = 1, datum = {})
      datum[stack_id] = stack_id
      current_path = '/api/v1/dynamic-requests/monthly'
      @conn.get URI.parse(pb.build_url_query(current_path, datum)).to_s
    end
def monthly(stack_id = 1, datum = {})
      datum[stack_id] = stack_id
      current_path = '/api/v1/dynamic-requests/monthly'
      @conn.get URI.parse(pb.build_url_query(current_path, datum)).to_s
    end
@param [SFRest::Connection] conn
 Gets the montly usage data.
 @param stack_id [Integer] The stack of sites of interest
 @param datum [Hash] Optional filter parameters

   'start_from' => "YYYY-MM", # String
   'sort_order' => "acs|desc", # String
   'limit' => Integer, # Number of months to list (max 120)
   'page' => Integer # Page number to show

 @return [Hash] The dynamic request data.

      { 'count' => Integer,
       'time' => String date,
       'most_recent_data' => 'YYYY-MM-DD',
       'dynamic_requests' => {
       '2016-10' => {
         'date' => '2016-10',
          'stack_id' => 1,
          'total_dynamic_requests'=> 106,
          '2xx_dynamic_requests'=> 100,
          '3xx_dynamic_requests'=> 3,
          '4xx_dynamic_requests'=> 2,
          '5xx_dynamic_requests'=> 1,
          'total_runtime'=> 101.4,
          '2xx_runtime'=> 100,
          '3xx_runtime'=> 0.9,
          '4xx_runtime'=> 0.4,
          '5xx_runtime'=> 0.1 }
        }