code: def _is_heartbeat(message):
      return message.strip() == ""
  
file_path: neptune-client/src/neptune/legacy/internal/threads/aborting_thread.py
imports: import threading
  from websocket import WebSocketConnectionClosedException
  from neptune.legacy.internal.threads.neptune_thread import NeptuneThread
  from neptune.legacy.internal.websockets.message import MessageType
  from neptune.legacy.internal.websockets.websocket_message_processor import WebsocketMessageProcessor
label_desc: Use image node_id 4 for calling the AbortingThread obj's underlying member method code with example usage: obj._is_heartbeat(message) and returns: unknown