AWS CloudFormation：EventBridge规则事件模式detail格式不符问题

我有一段用于AWS EventBridge规则的CloudFormation代码片段：

AutoscalingRule:
  Type: AWS::Events::Rule
  Properties:
    Description: "AutoscalingRule"
    EventPattern:
      source:
        - aws.autoscaling
      detail:
        - !Sub "AutoScalingGroupName: ${AutoscalingGroup}"
      detail-type:
        - "EC2 Instance Launch Successful"
        - "EC2 Instance Terminate Successful"
    State: "ENABLED"
    Targets:
      -
        Arn:
          Fn::GetAtt:
            - "AutoscalingMonitoringLambda"
            - "Arn"
        Id: "autoscaling-monitoring"

问题在于Event Pattern的detail部分格式与控制台创建的样式不符。控制台创建的detail部分如下：

{
  "source": ["aws.autoscaling"],
  "detail-type": ["EC2 Instance Launch Successful", "EC2 Instance Terminate Successful"],
  "detail": {
    "AutoScalingGroupName": ["test"]
  }
}

但通过CloudFormation部署后，格式变成：

{
  "detail-type": ["EC2 Instance Launch Successful", "EC2 Instance Terminate Successful"],
  "source": ["aws.autoscaling"],
  "detail": ["AutoScalingGroupName: test"]
}

我尝试过以JSON形式插入或手动格式化，但都无效。请问应如何修改detail部分，使其与控制台创建的样式一致？

解决方法 #

你当前的detail字段写法错误，将其写成了字符串数组，正确的写法应为嵌套键值对结构，把AutoScalingGroupName作为键，对应的值设为包含自动扩缩组名称的数组，这样就能和控制台格式匹配。

修改后的CloudFormation代码片段如下：

AutoscalingRule:
  Type: AWS::Events::Rule
  Properties:
    Description: "AutoscalingRule"
    EventPattern:
      source:
        - aws.autoscaling
      detail:
        AutoScalingGroupName:
          - !Sub "${AutoscalingGroup}"
      detail-type:
        - "EC2 Instance Launch Successful"
        - "EC2 Instance Terminate Successful"
    State: "ENABLED"
    Targets:
      -
        Arn:
          Fn::GetAtt:
            - "AutoscalingMonitoringLambda"
            - "Arn"
        Id: "autoscaling-monitoring"

说明 #

• 原写法中detail是包含"AutoScalingGroupName: ${AutoscalingGroup}"字符串的数组，会被解析为字符串列表，不符合EventBridge的事件匹配格式要求。
• 修改后detail是一个对象，AutoScalingGroupName对应的值为数组，数组元素通过!Sub引用自动扩缩组名称，部署后的Event Pattern结构将和控制台创建的完全一致。

内容的提问来源于stack exchange，提问作者Alexandru Constantin Arvinte