code: def metrics_asserted_pct(self):
          
          num_metrics = len(self._metrics)
          num_asserted = len(self._asserted)
  
          if num_metrics == 0:
              if num_asserted == 0:
                  return 100
              else:
                  return 0
  
          return num_asserted / num_metrics * 100
docs: Return the metrics assertion coverage