code: def json_md5(self):
      json_str = json.dumps(vars(self), sort_keys=True)
      return hashlib.md5(json_str.encode("utf-8")).hexdigest()
  
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 5 for calling the Metric obj's underlying member method code with example usage: obj.json_md5() and returns: hashlib