当源状态机发生故障时，Cloudwatch事件规则不会调用

Question

我有一个运行2个独立lambda的步进函数。如果步进函数失败或超时，我想通过SNS收到一封电子邮件，告诉我步进函数失败了。我使用云形成创建了事件规则，并在事件模式中指定了状态机ARN。当步进函数失败时，不会发送任何电子邮件。如果我删除stateMachineArn参数并运行我的步进函数，我会收到失败的电子邮件。我已经反复检查了无数次，我是否为状态机输入了正确的ARN。事件规则的CF如下（YAML格式）。谢谢。

  FailureEvent:
    Type: AWS::Events::Rule
    DependsOn:
      - StateMachine
    Properties:
      Name: !Ref FailureRuleName
      Description: "EventRule"
      EventPattern:
        detail-type:
          - "Step Functions Execution Status Change"
        detail:
          status:
            - "FAILED"
            - "TIMED_OUT"
        stateMachineArn: ["arn:aws:states:region:account#:stateMachine:statemachine"]
      Targets:
        -
          Arn:
            Ref: SNSARN
          Id: !Ref SNSTopic

Answer 1

我确实对其进行了修复和扩展，以调用lambda，该lambda使用lambda发布自定义SNS电子邮件。我的EventPattern部分中的对齐方式不正确。见下文。感谢@Marcin。

FailureEvent:
Type: AWS::Events::Rule
DependsOn:
  - FMIStateMachine
Properties:
  Description: !Ref FailureRuleDescription
  Name: !Ref FailureRuleName
  State: "ENABLED"
  RoleArn:
    'Fn::Join': ["", ['arn:aws:iam::', !Ref 'AWS::AccountId', ':role/', !Ref LambdaExecutionRole]]
  EventPattern:
    detail-type:
      - "Step Functions Execution Status Change"
    detail:
      status:
        - "FAILED"
        - "TIMED_OUT"
      stateMachineArn: [!Ref StateMachine]
  Targets:
    - Arn:
        'Fn::Join': ["", ['arn:aws:lambda:', !Ref 'AWS::Region', ':', !Ref 'AWS::AccountId', ':function:', !Ref FailureLambda]]
      Id: !Ref FailureLambda
      Input: !Sub '{"failed_service": "${StateMachineName}","sns_arn": "arn:aws:sns:${AWS::Region}:${AWS::AccountId}:${SNSTopic}"}'