code: def retrieveVals(self):
          
          file_stats = self._fileInfo.getContainerStats()
          for contname in self._fileContList:
              stats = file_stats.get(contname)
              if stats is not None:
                  if self.hasGraph('rackspace_cloudfiles_container_size'):
                      self.setGraphVal('rackspace_cloudfiles_container_size', contname,
                                       stats.get('size'))
                  if self.hasGraph('rackspace_cloudfiles_container_count'):
                      self.setGraphVal('rackspace_cloudfiles_container_count', contname,
                                       stats.get('count'))
docs: Retrieve values for graphs.