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用于设置 Route 53 运行状况检查的 Amazon CloudFormation 模板

使用全局端点时，必须进行 Route 53 运行状况检查，以监控各区域的状态。以下模板定义了一条 Amazon CloudWatch 警报，并用它来定义 Route 53 运行状况检查。

用于定义 Route 53 运行状况检查的 Amazon CloudFormation 模板

使用以下模板定义您的 Route 53 运行状况检查。

Description: |-
  Global endpoints health check that will fail when the average Amazon EventBridge 
  latency is above 30 seconds for a duration of 5 minutes. Note, missing data will 
  cause the health check to fail, so if you only send events intermittently, consider 
  changing the heath check to use a longer evaluation period or instead treat missing 
  data as 'missing' instead of 'breaching'.

Metadata:
  AWS::CloudFormation::Interface:
    ParameterGroups: 
      - Label: 
          default: "Global endpoint health check alarm configuration"
        Parameters:
          - HealthCheckName
          - HighLatencyAlarmPeriod
          - MinimumEvaluationPeriod
          - MinimumThreshold
          - TreatMissingDataAs
    ParameterLabels:
      HealthCheckName:
        default: Health check name
      HighLatencyAlarmPeriod:
        default: High latency alarm period
      MinimumEvaluationPeriod:
        default: Minimum evaluation period
      MinimumThreshold:
        default: Minimum threshold
      TreatMissingDataAs:
        default: Treat missing data as

Parameters:
  HealthCheckName:
    Description: Name of the health check
    Type: String
    Default: LatencyFailuresHealthCheck
  HighLatencyAlarmPeriod:
    Description: The period, in seconds, over which the statistic is applied. Valid values are 10, 30, 60, and any multiple of 60.
    MinValue: 10
    Type: Number
    Default: 60
  MinimumEvaluationPeriod:
    Description: The number of periods over which data is compared to the specified threshold. You must have at least one evaluation period.
    MinValue: 1
    Type: Number
    Default: 5
  MinimumThreshold:
    Description: The value to compare with the specified statistic.
    Type: Number
    Default: 30000
  TreatMissingDataAs:
    Description: Sets how this alarm is to handle missing data points.
    Type: String
    AllowedValues:
      - breaching
      - notBreaching
      - ignore
      - missing
    Default: breaching  

Mappings:
  "InsufficientDataMap":
    "missing":
      "HCConfig": "LastKnownStatus"
    "breaching":
      "HCConfig": "Unhealthy"  

Resources:
  HighLatencyAlarm:
      Type: AWS::CloudWatch::Alarm
      Properties:
        AlarmDescription: High Latency in Amazon EventBridge
        MetricName: IngestionToInvocationStartLatency
        Namespace: AWS/Events
        Statistic: Average
        Period: !Ref HighLatencyAlarmPeriod
        EvaluationPeriods: !Ref MinimumEvaluationPeriod
        Threshold: !Ref MinimumThreshold
        ComparisonOperator: GreaterThanThreshold
        TreatMissingData: !Ref TreatMissingDataAs

  LatencyHealthCheck:
      Type: AWS::Route53::HealthCheck
      Properties:
        HealthCheckTags:
          - Key: Name
            Value: !Ref HealthCheckName
        HealthCheckConfig:
          Type: CLOUDWATCH_METRIC
          AlarmIdentifier:
            Name:
              Ref: HighLatencyAlarm
            Region: !Ref AWS::Region
          InsufficientDataHealthStatus: !FindInMap [InsufficientDataMap, !Ref TreatMissingDataAs, HCConfig]

Outputs:
  HealthCheckId:
    Description: The identifier that Amazon Route 53 assigned to the health check when you created it.
    Value: !GetAtt LatencyHealthCheck.HealthCheckId

事件 ID 可能会随着 API 调用而变化，因此跨区域关联事件需要有一个不可变的唯一标识符。在进行与使用者有关的设计时，还应考虑到幂等性。这样一来，如果您要复制事件或从存档中重放事件，在两个区域中处理事件就不会产生任何副作用。

CloudWatch 警报模板属性

模板的 CloudWatch 警报部分使用了以下属性：

Route 53 运行状况检查模板属性

模板的 Route 53 运行状况检查部分使用了以下属性：