code: def maximumBelow(requestContext, seriesList, n):
      
      results = []
      for series in seriesList:
          val = safeMax(series)
          if val is None or val <= n:
              results.append(series)
      return results
docs: Takes one metric or a wildcard seriesList followed by a constant n.
      Draws only the metrics with a maximum value below n.
  
      Example::
  
          &target=maximumBelow(system.interface.eth*.packetsSent,1000)
  
      This would only display interfaces which always sent less than 1000
      packets/min.