Lambda 在响应中缺少一个字段

Question

我有 Python3 脚本，它从 AWS 中提取有关 AWS 网络防火墙托管规则组的信息 -

def get_current_version(rule_group_arn):
    response = network_firewall.describe_rule_group_metadata(RuleGroupArn=rule_group_arn)
    return response

print(get_current_version("arn:aws:network-firewall:eu-central-1:aws-managed:stateful-rulegroup/ThreatSignaturesDoSStrictOrder"))

当我执行它时，我得到响应：

{'RuleGroupArn': 'arn:aws:network-firewall:eu-central-1:aws-managed:stateful-rulegroup/ThreatSignaturesDoSStrictOrder', 'RuleGroupName': 'ThreatSignaturesDoSStrictOrder', 'Description': 'Signatures that detect Denial of Service attempts.', 'Type': 'STATEFUL', 'Capacity': 200, 'StatefulRuleOptions': {'RuleOrder': 'STRICT_ORDER'}, 'LastModifiedTime': datetime.datetime(2022, 6, 21, 12, 54, 12, 241000, tzinfo=tzlocal()), 'ResponseMetadata': {'RequestId': 'a4ea84ee-f908-4f2c-9ff1-6b4542b1313c', 'HTTPStatusCode': 200, 'HTTPHeaders': {'x-amzn-requestid': 'a4ea84ee-f908-4f2c-9ff1-6b4542b1313c', 'content-type': 'application/x-amz-json-1.0', 'content-length': '354', 'date': 'Tue, 27 Sep 2022 18:10:26 GMT'}, 'RetryAttempts': 0}}

我想在Lamda中运行类似的function，所以我写了这段代码：

def lambda_handler(event, context):
    response = network_firewall.describe_rule_group_metadata(RuleGroupArn="arn:aws:network-firewall:eu-central-1:aws-managed:stateful-rulegroup/ThreatSignaturesDoSStrictOrder")
    return response

但是，我得到的响应与前一个不同，即缺少一个字段：LastModifiedTime，该字段对我的代码逻辑至关重要。

{
  "RuleGroupArn": "arn:aws:network-firewall:eu-central-1:aws-managed:stateful-rulegroup/ThreatSignaturesDoSStrictOrder",
  "RuleGroupName": "ThreatSignaturesDoSStrictOrder",
  "Description": "Signatures that detect Denial of Service attempts.",
  "Type": "STATEFUL",
  "Capacity": 200,
  "StatefulRuleOptions": {
    "RuleOrder": "STRICT_ORDER"
  },
  "ResponseMetadata": {
    "RequestId": "45bafe6f-8df4-479a-b0bb-c4572dc7f039",
    "HTTPStatusCode": 200,
    "HTTPHeaders": {
      "x-amzn-requestid": "45bafe6f-8df4-479a-b0bb-c4572dc7f039",
      "content-type": "application/x-amz-json-1.0",
      "content-length": "354",
      "date": "Tue, 27 Sep 2022 18:37:07 GMT"
    },
    "RetryAttempts": 0
  }
}

我已经阅读了文档，它指出应该存在该字段。 也许我错过了一些观点。

提前感谢您的帮助！