docs: def returner(ret):
      '''
      Parse the return data and return metrics to Librato.
      '''
      librato_conn = _get_librato(ret)
  
      q = librato_conn.new_queue()
  
      if ret['fun'] == 'state.highstate':
          log.debug('Found returned Highstate data.')
          # Calculate the runtimes and number of failed states.
          stats = _calculate_runtimes(ret['return'])
          log.debug('Batching Metric retcode with %s', ret['retcode'])
          q.add('saltstack.highstate.retcode',
                ret['retcode'], tags={'Name': ret['id']})
  
          log.debug(
              'Batching Metric num_failed_jobs with %s',
              stats['num_failed_states']
          )
          q.add('saltstack.highstate.failed_states',
                stats['num_failed_states'], tags={'Name': ret['id']})
  
          log.debug(
              'Batching Metric num_passed_states with %s',
              stats['num_passed_states']
          )
          q.add('saltstack.highstate.passed_states',
                stats['num_passed_states'], tags={'Name': ret['id']})
  
          log.debug('Batching Metric runtime with %s', stats['runtime'])
          q.add('saltstack.highstate.runtime',
                stats['runtime'], tags={'Name': ret['id']})
  
          log.debug(
              'Batching Metric runtime with %s',
              stats['num_failed_states'] + stats['num_passed_states']
          )
          q.add('saltstack.highstate.total_states', stats[
                'num_failed_states'] + stats['num_passed_states'], tags={'Name': ret['id']})
  
      log.info('Sending metrics to Librato.')
      q.submit()