code: def update_message(self, err_message):
      # If there is an error message in the test result, record the error message and report it
      self.err_message = err_message
  
file_path: milvus/tests/benchmark/milvus_benchmark/metrics/models/metric.py
imports: import time
  import datetime
  import json
  import hashlib
  from .env import Env
  from .server import Server
  from .hardware import Hardware
label_desc: Use image node_id 8 for calling the Metric obj's underlying member method code with example usage: obj.update_message(err_message) without return types