code: def minimumBelow(requestContext, seriesList, n):
      
      results = []
      for series in seriesList:
          val = safeMin(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 minimum value below n.
  
      Example::
  
          &target=minimumBelow(system.interface.eth*.packetsSent,1000)
  
      This would only display interfaces which sent at one point less than
      1000 packets/min.