code: def currentAbove(requestContext, seriesList, n):
      
      results = []
      for series in seriesList:
          val = safeLast(series)
          if val is not None and val >= n:
              results.append(series)
      return results
docs: Takes one metric or a wildcard seriesList followed by an integer N.
      Out of all metrics passed, draws only the metrics whose value is above N
      at the end of the time period specified.
  
      Example::
  
          &target=currentAbove(server*.instance*.threads.busy,50)
  
      Draws the servers with more than 50 busy threads.