code: def _calculate_status(self, target_freshness, freshness):
          
          # if freshness > warn_after > error_after, you'll get an error, not a
          # warning
          for key in ('error', 'warn'):
              fullkey = '{}_after'.format(key)
              if fullkey not in target_freshness:
                  continue
  
              target = target_freshness[fullkey]
              kwname = target['period'] + 's'
              kwargs = {kwname: target['count']}
              if freshness > timedelta(**kwargs).total_seconds():
                  return key
          return 'pass'
docs: Calculate the status of a run.
  
          :param dict target_freshness: The target freshness dictionary. It must
              match the freshness spec.
          :param timedelta freshness: The actual freshness of the data, as
              calculated from the database's timestamps