爲什麼通過CloudFormation創建的CloudWatch請求計數警報產生「數據不足」？

我正在爲我的應用程序使用AWS CloudFormation，並試圖通過各自的模板發出請求計數警報。我可以成功地對Elastic Load Balancer直接發出請求計數警報，但是當我嘗試通過CloudFormation模板實現相同時，Amazon CloudWatch內的警報狀態爲「數據不足」。爲什麼通過CloudFormation創建的CloudWatch請求計數警報產生「數據不足」？

我ELB JSON是：

"ElasticLoadBalancer": { 
    "Type": "AWS::ElasticLoadBalancing::LoadBalancer", 
    "Properties": { 
    "AvailabilityZones": { 
     "Fn::GetAZs": "" 
    }, 
    "Listeners": [ 
     { 
     "LoadBalancerPort": "80", 
     "InstancePort": { 
      "Ref": "WebServerPort" 
     }, 
     "Protocol": "HTTP" 
     } 
    ], 
    "HealthCheck": { 
     "Target": { 
     "Fn::Join": [ 
      "", 
      [ 
      "HTTP:", 
      { 
       "Ref": "WebServerPort" 
      }, 
      "/" 
      ] 
     ] 
     }, 
     "HealthyThreshold": "3", 
     "UnhealthyThreshold": "5", 
     "Interval": "30", 
     "Timeout": "5" 
    } 
    } 
},

我的報警JSON是：

"StatisticAlarmLow": { 
    "Type": "AWS::CloudWatch::Alarm", 
    "Properties": { 
    "AlarmDescription": "Alarm if there are too many unhealthy hosts.", 
    "MetricName": "RequestCount", 
    "Namespace": "AWS/ELB", 
    "Statistic": "Sum", 
    "Period": "60", 
    "EvaluationPeriods": "2", 
    "ComparisonOperator": "LessThanThreshold", 
    "Threshold": "1500", 
    "AlarmActions": [ 
     { 
     "Ref": "WebServerScaleUpPolicy" 
     } 
    ], 
    "Unit": "Count", 
    "Dimensions": [ 
     { 
     "Name": "AutoScalingGroupName", 
     "Value": { 
      "Ref": "WebServerGroup" 
     } 
     } 
    ] 
    } 
}, 

"StatisticAlarmHigh": { 
    "Type": "AWS::CloudWatch::Alarm", 
    "Properties": { 
    "AlarmDescription": "Alarm if there are too many unhealthy hosts.", 
    "MetricName": "RequestCount", 
    "Namespace": "AWS/ELB", 
    "Statistic": "Sum", 
    "Period": "60", 
    "EvaluationPeriods": "2", 
    "ComparisonOperator": "GreaterThanThreshold", 
    "Threshold": "4000", 
    "AlarmActions": [ 
     { 
     "Ref": "WebServerScaleUpPolicy" 
     } 
    ], 
    "Unit": "Count", 
    "Dimensions": [ 
     { 
     "Name": "AutoScalingGroupName", 
     "Value": { 
      "Ref": "WebServerGroup" 
     } 
     } 
    ] 
    } 
},

從上面產生具有「數據不足」作爲狀態的報警。有誰可以告訴我可能是什麼原因？如果在ELB上有任何示例/示例模板可用於請求計數報警，我們將不勝感激。

來源

2012-04-07 Anand Soni

您Amazon CloudFormation模板的Elastic Load Balancing (ELB)片段報警片段看起來不錯，但你的Amazon CloudWatch片段包含想必不正確的尺寸，只要它引用了一個AutoScalingGroupName命名WebServerGroup - 這不是一個支持的尺寸爲每節尺寸

：對於彈性負載Monitoring Your Load Balancer Using CloudWatch頁面上均衡度量

彈性負載平衡數據可以沿着以下任何尺寸

LoadBalancerName - 將度量標準數據限制爲連接到指定的負載平衡器的Amazon EC2實例。
AvailabilityZone - 將指標數據限制爲指定可用區中的負載均衡器。

來源

2012-04-07 21:33:39

謝謝Steffen Opel。我已經改變了尺寸，它的工作原理。 – 2012-04-09 05:06:02

爲什麼通過CloudFormation創建的CloudWatch請求計數警報產生「數據不足」？

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