code: def _formatVals(self, val_list):
          
          vals = []
          for (name, val) in val_list:
              if val is not None:
                  if isinstance(val, float):
                      vals.append("%s.value %f" % (name, val))
                  else:
                      vals.append("%s.value %s" % (name, val))
              else:
                  vals.append("%s.value U" % (name,))
          return "\n".join(vals)
docs: Formats value list from Munin Graph and returns multi-line value
          entries for the plugin fetch cycle.
          
          @param val_list: List of name-value pairs. 
          @return:         Multi-line text.