This topic describes how to use the alert callback feature to send alert notifications to your existing operations and maintenance (O&M) or notification system.


  • The callback URL that can be accessed by using the Internet is prepared.
  • URL callback is enabled as an alert notification method in your existing O&M or notification system.

Background information

  • Based on the retry policy of the alert callback feature, the number of retries is 3 and the timeout period is 5s.
  • Only HTTP callbacks are supported.

In addition to emails and DingTalk chatbots, Cloud Monitor allows you to report alerts by using the alert callback feature. The alert callback feature allows Cloud Monitor to push alert notifications to a specific Internet URL by sending HTTP POST requests. You can take actions based on the received notifications.


  1. Log on to the Cloud Monitor console.
  2. In the left-side navigation pane, choose Alerts > Alert Rules.
  3. On the Threshold Value Alert tab of the Alert Rules page, find the alert rule that you want to modify and click Modify in the Actions column.
    Note Instead of editing an existing rule, you can also create an alert rule.
  4. In the Notification Method section of the Create Alert Rule page, enter the prepared callback URL in the HTTP CallBack field.
    Callback URL of the alert rule
  5. Click Confirm.


If an alert is triggered based on the alert rule, Cloud Monitor sends an HTTP POST request that contains alert information to the callback URL. The following table describes the parameters of the HTTP POST request.

Note Cloud Monitor cannot push the content of an event alert in an HTTP POST request.
Parameter Data type Description
alertName String The name of the alert.
alertState String The status of the alert. Valid values:
  • OK
curValue String The value of the metric when the alert was triggered or cleared.
dimensions String The object for which the alert was triggered. Example: {userId=12****, instanceId=i-12****}.
expression String The conditions for triggering the alert.
instanceName String The name of the instance.
metricName String The name of the metric.
metricProject String The name of the service. For more information about metrics for different services, see Overview.
namespace String The namespace of the service. The value of this parameter is the same as that of the metricProject parameter.
preTriggerLevel String The level of the alert triggered last time.
ruleId String The ID of the alert rule based on which the alert was triggered.
timestamp String The timestamp when the alert was triggered.
triggerLevel String The level of the alert triggered this time.
userId String The ID of the user.
Sample POST request
Content-Type: application/x-www-form-urlencoded; charset=UTF-8

expression=$Average>=95&metricName=Host.mem.usedutilization&instanceName=instance-name-****&signature=eEq1zHuCUp0XSmLD8p8VtTKF****&metricProject=acs_ecs&userId=12****&curValue=97.39&alertName=Basic monitoring-ECS-memory usage&namespace=acs_ecs&triggerLevel=WARN&alertState=ALERT&preTriggerLevel=WARN&ruleId=applyTemplateee147e59-664f-4033-a1be-e9595746****&dimensions={userId=12****), instanceId=i-12****}&timestamp=1508136760