code: def get_actor_metadata(self):
      return "metadata"
  
file_path: ray/python/ray/tests/test_actor_group.py
imports: import time
  import warnings
  import pytest
  import ray
  from ray.util.actor_group import ActorGroup
label_desc: Use image node_id 2 for calling the DummyActor obj's underlying member method code with example usage: obj.get_actor_metadata() and returns: str