old_contents: class RRDDataSource(object):
      name = ""
      data_source_type = ""
      heartbeat = ""
      temp_value = 0
  
      def __init__(self, name, data_source_type, heartbeat):
          self.name = name
          self.data_source_type = data_source_type
          self.heartbeat = heartbeat
  
new_contents: class RRDDataSource(object):
      name = ""
      data_source_type = ""
      heartbeat = ""
      temp_value = 0
  
      def __init__(self, name, data_source_type, heartbeat, temp_value=None):
          self.name = name
          self.data_source_type = data_source_type
          self.heartbeat = heartbeat
          self.temp_value = temp_value
  
subject: Add temp_value (optional) parameter to RRDDataSource constructor.