小编P. *_*Str的帖子

最近， AWS宣布Cloudwatch警报可以对指标使用数学表达式。我决定创建一个警报，以比较2个单一指标的总和与给定阈值。这意味着根据AWS文档，我的表达式应为SUM（[m1，m2]），其中m1和m2是2个单一指标。我还决定使用cloudformation模板（在yaml中）实现这个想法。这是Cloudwatch警报定义：

BillingAlarmExpression:
  Type: AWS::CloudWatch::Alarm
  Properties:
    AlarmActions:
      - !Ref BillingAlertTopic
    AlarmDescription: String
    ComparisonOperator: GreaterThanOrEqualToThreshold
    EvaluationPeriods: 1
    Metrics:
      - Id: m1
        MetricStat:
          Metric:
            Dimensions:
              - Name: ServiceName
                Value: AmazonEC2
              - Name: Currency
                Value: USD
            MetricName: Estimated­Charges
            Namespace: AWS/Billing
          Period: 86400
          Stat: Maximum
        ReturnData: False
      - Id: m2
        MetricStat:
          Metric:
            Dimensions:
              - Name: ServiceName
                Value: AmazonCloudwatch
              - Name: Currency
                Value: USD
            MetricName: Estimated­Charges
            Namespace: AWS/Billing
          Period: 86400
          Stat: Maximum
        ReturnData: False
      - Id: Expr1
        Expression: SUM([m1,m2])
        Label: Yeap
    Threshold: 100 …