code: def dashed(requestContext, seriesList, dashLength=5):
      
      for series in seriesList:
          series.name = 'dashed(%s, %g)' % (series.name, dashLength)
          series.options['dashed'] = dashLength
      return seriesList
docs: Takes one metric or a wildcard seriesList, followed by a float F.
  
      Draw the selected metrics with a dotted line with segments of length F
      If omitted, the default length of the segments is 5.0
  
      Example::
  
          &target=dashed(server01.instance01.memory.free,2.5)