code: def _tracker_str(item):
      
      instance = tracker(item)
      if instance is not None:
          if isinstance(instance, str):
              return instance
          elif isinstance(instance, tuple):
              return instance
          else:
              return instance.uuid
      else:
          #Must be a simple built-in type like `int` or `float`, in which case we
          #don't want to convert it to a string.
          return item
docs: Returns a string representation of the tracker object for the given item.
      
      Args:
          item: object to get tracker for.
          fqdn (str): fully-qualified domain name of the object.