AWS CloudFormation-如何为警报（跨区域警报）指定CloudWatch指标的区域

Question

I'd like to find out how/where to specify the region of a CloudWatch metric in a CloudFormation template. I have attempted to specify the value in multiple locations. Which has resulted in mostly malformed object or unsupported property errors. I have to assume its either not supported or there may be a workaround in the configuration. I have also tried to modify the alarm source tab (In the AWS UI) region property, which saves and displays the correct graph values. Only later on it reverts on the final step of updating the alarm. This same behavior can be observed while creating a new alarm as well. Essentially what I want is something like cross-region alarms.

    MyAlarm:
        Type: "AWS::CloudWatch::Alarm"
        Properties:
            AlarmName: "MyAlarm"
            AlarmDescription: "a cool description"
            Dimensions:
              - Name: TaskListName
                Value: BatchWorkerTaskList
              - Name: Domain
                Value: SomeDomain
            Region: us-east-1 # <- tried this
            Metrics: 
                Region: us-east-1 # <- tried this
            MetricName: PendingTasks
            Namespace: AWS/SWF
            Period: 300
            ComparisonOperator: GreaterThanOrEqualToThreshold
            EvaluationPeriods: 1
            ExtendedStatistic: p50
            Threshold: 20
            Unit: Count
            AlarmActions:
            - !Ref "TriggerSomeScaling"
      

Answer 1

I'd like to find out how/where to specify the region of a CloudWatch metric in a CloudFormation template. I have attempted to specify the value in multiple locations. Which has resulted in mostly malformed object or unsupported property errors. I have to assume its either not supported or there may be a workaround in the configuration. I have also tried to modify the alarm source tab (In the AWS UI) region property, which saves and displays the correct graph values. Only later on it reverts on the final step of updating the alarm. This same behavior can be observed while creating a new alarm as well. Essentially what I want is something like cross-region alarms.

    MyAlarm:
        Type: "AWS::CloudWatch::Alarm"
        Properties:
            AlarmName: "MyAlarm"
            AlarmDescription: "a cool description"
            Dimensions:
              - Name: TaskListName
                Value: BatchWorkerTaskList
              - Name: Domain
                Value: SomeDomain
            Region: us-east-1 # <- tried this
            Metrics: 
                Region: us-east-1 # <- tried this
            MetricName: PendingTasks
            Namespace: AWS/SWF
            Period: 300
            ComparisonOperator: GreaterThanOrEqualToThreshold
            EvaluationPeriods: 1
            ExtendedStatistic: p50
            Threshold: 20
            Unit: Count
            AlarmActions:
            - !Ref "TriggerSomeScaling"