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