docstr: calculate the json string sha1 hash
docstr_tok: ["calculate","the","json","string","sha1","hash"]
code: def _sha1_hash_json(self, value: str) -> str:
      """calculate the json string sha1 hash"""
      sha1_hash = hashlib.new("sha1")
      binary_value = value.encode("ascii")
      sha1_hash.update(binary_value)
      sha1_res = sha1_hash.hexdigest()
      return sha1_res
  
imports: import copy
  import hashlib
  import json
  import logging
  import os
  import time
  from enum import Enum
  from typing import Any, Callable, Dict, List, Union
  import botocore
  from ray.autoscaler._private.aws.utils import client_cache, resource_cache
  from ray.autoscaler.tags import NODE_KIND_HEAD, TAG_RAY_CLUSTER_NAME, TAG_RAY_NODE_KIND
label_desc: Use image node_id 15 for calling the CloudwatchHelper obj's underlying member method code with example usage: obj._sha1_hash_json(value) and returns: sha1_res