code: def __add__(self, other) -> "MetricName":
      if isinstance(other, str):
          return self.__class__((*self.parts, other))
      elif isinstance(other, MetricName):
          return self.__class__(self.parts + other.parts)
      else:
          return self.__class__(self.parts + tuple(other))
  
imports: import time
  from dataclasses import dataclass
  from enum import Enum
  from typing import Any, Iterable, Iterator, Optional, Tuple, Union
label_desc: Use image node_id 6 for calling the MetricName obj's underlying member method code with example usage: obj.__add__(other) and returns: self, self, self