code: def list():
      '''List all known metrics'''
      for cls, metrics in metric_catalog.items():
          echo(white(cls.__name__))
  
          for metric in metrics.keys():
              echo('> {0}'.format(metric)f list():
      '''List all known metrics'''
      for cls, metrics in metric_catalog.items():
          echo(white(cls.__name__))
  
          for metric in metrics.keys():
              echo('> {0}'.format(metric))
docs: List all known metrics