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主要参考了以下位置的资料：

• 云服务器监控接口
• 腾讯云go-sdk example

方法一：使用腾讯云go-sdk

• go.mod文件中增加这样一行：

  github.com/tencentcloud/tencentcloud-sdk-go v3.0.172

• 准备好：secretId, secretKey，要查询的区域，CVM机器的实例ID

• 以下是例子代码：

  import (
  "github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/common"
  "github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/common/regions"
  Monitor "github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/monitor/v20180724"
  "github.com/tencentcloud/tencentcloud-sdk-go/tencentcloud/common/profile"
  )
  // ….

  func QueryCvmWanOuttraffic(SecretId string, secretKey string, region string, instanceId string) (string, error) {
  credential := common.NewCredential(SecretId, secretKey)
  cpf := profile.NewClientProfile()
  cpf.HttpProfile.ReqMethod = "GET"
  cpf.HttpProfile.ReqTimeout = 5
  cpf.Debug = true
  cpf.SignMethod = "HmacSHA1"
  monitorClient, err := Monitor.NewClient(credential, region, cpf)
  if err != nil {
  return "", err
  }
  req := Monitor.NewGetMonitorDataRequest()
  var v uint64 = 60
  req.Period = &v
  now := time.Now()
  var arr = []string{
  "WanOuttraffic",
  "QCE/CVM",
  "InstanceId",
  now.Add(time.Duration(-10) * time.Minute).Format("2006-01-02 15:04:05"), //查询最近10分钟的
  now.Format("2006-01-02 15:04:05"),
  }
  req.MetricName = &arr[0]
  req.Namespace = &arr[1]
  req.Instances = []Monitor.Instance{ &Monitor.Instance{ Dimensions: []Monitor.Dimension{
  &Monitor.Dimension{Name: &arr[2], Value: &instanceId},
  },
  },
  }
  req.StartTime = &arr[3]
  req.EndTime = &arr[4]
  resp, err := monitorClient.GetMonitorData(req)
  if err != nil {
  return "", err
  }
  return resp.ToJsonString(), nil
  }
  //
  QueryCvmWanOuttraffic(os.Getenv("TENCENTCLOUD_SECRET_ID"), os.Getenv("TENCENTCLOUD_SECRET_KEY"), regions.Guangzhou, "ins-xxxxxx")

方法2：使用https协议

直接上代码：

import (
    "crypto/hmac"
    "crypto/sha1"
    "encoding/base64"
)
// ....
func HttpsQueryCvmWanOuttraffic(SecretId string, secretKey string, region string, instanceId string) (string, error) {
    now := time.Now()
    var params = map[string]string{
        "namespace":          "qce/cvm",
        "metricName":         "wan_outtraffic",
        "dimensions.0.name":  "unInstanceId",
        "dimensions.0.value": instanceId,
        "startTime":          now.Add(time.Duration(-10) * time.Minute).Format("2006-01-02 15:04:05"),
        "endTime":            now.Format("2006-01-02 15:04:05"),
        "Region":             region,
        "Action":             "GetMonitorData",
        "SecretId":           SecretId,
        "Timestamp":          strconv.Itoa(int(now.Unix())),
        "Nonce":              strconv.Itoa(rand.Intn(1000000)),
    }
    arr := make([]string, 0, len(params))
    for k, _ := range params {
        arr = append(arr, k)
    }
    sort.Strings(arr)
    arrOut := make([]string, 0, len(arr))
    for _, item := range arr {
        arrOut = append(arrOut, item+"="+url.QueryEscape(params[item]))
    }
    paramStr := strings.Join(arrOut, "&")
    key := []byte(secretKey)
    mac := hmac.New(sha1.New, key)
    mac.Write([]byte(paramStr))
    Signature := base64.StdEncoding.EncodeToString(mac.Sum(nil))
    paramStr += "&Signature=" + Signature
    url := "https://monitor.tencentcloudapi.com/?"
    resp, err := http.Get(url + paramStr)
    if err != nil {
        return "", err
    }
    defer resp.Body.Close()
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        return "", err
    }
    return string(body), nil
}
//
HttpsQueryCvmWanOuttraffic(os.Getenv("TENCENTCLOUD_SECRET_ID"), os.Getenv("TENCENTCLOUD_SECRET_KEY"), "gz", "ins-xxxxxx")

返回的数据

返回数据大致如下：

{
  "Response":{
    "Period":60,
    "MetricName":"WanOuttraffic",
    "DataPoints":[
      {
        "Dimensions":[{"Name":"InstanceId","Value":"ins-xxxxx"}],
        "Timestamps":[1589629500,1589629560,1589629620,1589629680,1589629740,1589629800,1589629860,1589629920],
        "Values":[83.235,107.038,99.522,101.662,97.613,95.696,85.926,103.345]
      }
    ],
    "StartTime":"2020-05-16 19:45:00",
    "EndTime":"2020-05-16 19:55:00",
    "RequestId":"280b4f26-4117-4287-bc96-79e27283b0ed"
  }
}

可以看见，时间戳1589629920对应2020-5-16 19:52；这一分钟的网卡流量是103.345Mbps

在腾讯云官网核对一下

进入https://console.cloud.tencent.com/

在云服务器->实例->搜索ins-xxxxx->点击进入->监控->外网出带宽，时间粒度选择分钟，在19:52上看见：

成功了！嗨森！