code: def legendValue(requestContext, seriesList, *valueTypes):
      
      valueFuncs = {
          'avg': lambda s: safeDiv(safeSum(s), safeLen(s)),
          'total': safeSum,
          'min': safeMin,
          'max': safeMax,
          'last': safeLast,
      }
      system = None
      if valueTypes[-1] in ('si', 'binary'):
          system = valueTypes[-1]
          valueTypes = valueTypes[:-1]
      for valueType in valueTypes:
          valueFunc = valueFuncs.get(valueType, lambda s: '(?)')
          if system is None:
              for series in seriesList:
                  series.name += " (%s: %s)" % (valueType, valueFunc(series))
          else:
              for series in seriesList:
                  value = valueFunc(series)
                  formatted = None
                  if value is not None:
                      formatted = "%.2f%s" % format_units(value, system=system)
                  series.name = "%-20s%-5s%-10s" % (series.name, valueType,
                                                    formatted)
      return seriesList
docs: Takes one metric or a wildcard seriesList and a string in quotes.
      Appends a value to the metric name in the legend. Currently one or several
      of: `last`, `avg`, `total`, `min`, `max`. The last argument can be `si`
      (default) or `binary`, in that case values will be formatted in the
      corresponding system.
  
      Example::
  
          &target=legendValue(Sales.widgets.largeBlue, 'avg', 'max', 'si')