code: def squareRoot(requestContext, seriesList):
      
      for series in seriesList:
          series.name = "squareRoot(%s)" % (series.name)
          for i, value in enumerate(series):
              series[i] = safePow(value, 0.5)
      return seriesList
docs: Takes one metric or a wildcard seriesList, and computes the square root
      of each datapoint.
  
      Example::
  
          &target=squareRoot(Server.instance01.threads.busy)