为 cloudwatch 仪表板设置小部件。收到错误“仪表板正文无效，有 1 个验证错误”

Question

我无法在小部件中引用服务名称。

使用给定代码出现以下错误： 仪表板正文无效，有 1 个验证错误： [ { "dataPath": "/widgets/0/properties/metrics/0", "message": "Should NOT have more than 3 items" } ] （服务：AmazonCloudWatch ; 状态码: 400; 错误码: InvalidParameterInput

"CloudwatchDashboard": {
      "Type": "AWS::CloudWatch::Dashboard",
      "Properties": {

"{ \"widgets\":
[{ \"type\":\"metric\", 
\"x\":0, 
\"y\":0, 
\"width\":12, 
\"height\":6, 
\"properties\":
{ \"metrics\":
[[ \"AWS/ECS\", \"CPUUtilization\", \"ServiceName\",
{ \"Fn::Sub\": [ \"${Service}\", { \"Service\": {\"Ref\" : \"AWS::StackName\" }} ]}]], 
\"region\": \"us-east-1\", 
\"stat\":\"Average\",
\"period\": 300, 
\"view\": \"timeSeries\", 
\"title\":\"CPUUtilization\", 
\"stacked\": false } }]}"

      }
    }

Answer 1

您可以在 yaml 模板中以 JSON 格式定义 CloudWatch 仪表板，如下所示：

  ExampleDashboard:
    Type: AWS::CloudWatch::Dashboard
    Properties: 
      DashboardName: 'SomeDashboard'
      DashboardBody: !Sub '
{
    "widgets": [
        {
            "type": "metric",
            "x": 0,
            "y": 0,
            "width": 12,
            "height": 6,
            "properties": {
                "metrics": [
                    [ "AWS/ECS", "CPUUtilization", "ServiceName", "${AWS::StackName}"]
                ],
                "region": "us-east-1",
                "stat": "Average",
                "period": 300,
                "view": "timeSeries",
                "title": "CPUUtilization",
                "stacked": false
            }
        }
    ]
}
'

Answer 2

仪表板正文是一个字符串，因此将Sub 语法放在该字符串中会使其成为仪表板定义的一部分，从而使其无效。

我建议切换到 yaml 语法。这将使您的仪表板定义更清晰，您可以像这样使用Sub：

ExampleDashboard:
    Type: AWS::CloudWatch::Dashboard
    Properties: 
        DashboardName: 'SomeDashboard'
        DashboardBody: !Sub |
          {
              "widgets": [
                  {
                      "type": "metric",
                      "x": 0,
                      "y": 0,
                      "width": 12,
                      "height": 6,
                      "properties": {
                          "metrics": [
                              [ "AWS/ECS", "CPUUtilization", "ServiceName", "${AWS::StackName}"]
                          ],
                          "region": "us-east-1",
                          "stat": "Average",
                          "period": 300,
                          "view": "timeSeries",
                          "title": "CPUUtilization",
                          "stacked": false
                      }
                  }
              ]
          }

在 json 中也是一样的：

"ExampleDashboard": {
            "Type": "AWS::CloudWatch::Dashboard",
            "Properties": {
                "DashboardName": "SomeDashboard",
                "DashboardBody": {
                    "Fn::Sub": "{\n    \"widgets\": [\n        {\n            \"type\": \"metric\",\n            \"x\": 0,\n            \"y\": 0,\n            \"width\": 12,\n            \"height\": 6,\n            \"properties\": {\n                \"metrics\": [\n                    [ \"AWS/ECS\", \"CPUUtilization\", \"ServiceName\", \"${AWS::StackName}\"]\n                ],\n                \"region\": \"us-east-1\",\n                \"stat\": \"Average\",\n                \"period\": 300,\n                \"view\": \"timeSeries\",\n                \"title\": \"CPUUtilization\",\n                \"stacked\": false\n            }\n        }\n    ]\n}\n"
                }
            }
        }