AWS云监视MaxQueryTimeRangeExceed

Question

我是AWS (和nodejs)的新手，我正在尝试让cloudwatch的getMetricData工作。我使用一个简单的Cloudwatch查询来获取实例的CPU利用率。但不管我做什么，我都会得到这个

{
  ResponseMetadata: { RequestId: '5253fbfc-5aa2-4dfb-871b-1453f8610d80' },
  MetricDataResults: [
    {
      Id: 'q1',
      Label: 'q1',
      Timestamps: [],
      Values: [],
      StatusCode: 'Complete',
      Messages: []
    }
  ],
  Messages: [
    {
      Code: 'MaxQueryTimeRangeExceeded',
      Value: 'Max time window exceeded for query'
    }
  ]
}

这是我的密码

const AWS = require("aws-sdk");
AWS.config.loadFromPath("./config.json");

var cloudwatch = new AWS.CloudWatch({apiVersion: "2010-08-01"});

var params = {

    StartTime: new Date('june 06, 2022 17:30'),
    EndTime: new Date('june 06, 2022 18:00'), 
    MetricDataQueries: [ 
      {
        Id: 'q1', 
        Expression: "SELECT AVG(CPUUtilization) FROM SCHEMA(\"AWS/EC2\", InstanceId) WHERE InstanceId = 'i-**********'",
        Period: '600'
      },
    ],
    
  };
  cloudwatch.getMetricData(params, function(err, data) {
    if (err) console.log(err, err.stack); 
    else     console.log(data);           
  });

Answer 1

您只能使用SELECT ...语法请求最新的3小时数据。

来自文档，

度量查询只能查询最近三个小时的度量数据。

看起来，您只获取单个实例的CPUUtilization。您可以通过MetricStat对象获得这个结果。就像这样：

var params = {

    StartTime: new Date('june 06, 2022 17:30'),
    EndTime: new Date('june 06, 2022 18:00'), 
    MetricDataQueries: [ 
      {
      Id: 'm1',
      Label: 'CPUUtilization',
      MetricStat: {
        Metric: {
          Namespace: 'AWS/EC2',
          MetricName: 'CPUUtilization',
          Dimensions: [
            {
              Name: 'InstanceId',
              Value: 'i-xxxxxxxxxx'
            }
          ]
        },
        Period: '600',
        Stat: 'Average'
      }
    },
    ],
    
  };