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

Prerequisites

  • The callback URL that can be accessed over the Internet is prepared.
  • The Classless Inter-Domain Routing (CIDR) block 47.74.206.0/24 is added to the whitelist of your firewall.

Background information

Notice
  • If an alert callback fails, three retries are performed. Each callback request times out after 5 seconds.
  • Only HTTP callbacks are supported.

Cloud Monitor allows you to report alerts by using emails and DingTalk chatbots. Cloud Monitor also allows you to report alerts by using the alert callback feature. This way, you can handle alert events in a more flexible way. After you enable the alert callback feature, Cloud Monitor can push alert notifications to the specified Internet URL by sending HTTP POST requests. You can take actions based on the received notifications.

Procedure

  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 Rule page, find the alert rule that you want to modify and click Modify in the Actions column.
    Note You can also create an alert rule.
  4. Enter the prepared callback URL in the Alert Callback field.
  5. Click Confirm.

Result

If an alert is triggered based on the alert rule, Cloud Monitor sends an HTTP POST request that contains the 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: The alert rule has no active alert.
  • ALERT: Alerts are triggered based on the alert rules.
  • INSUFFICIENT_DATA: The alert rule has no data.
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 that triggered 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 that was triggered last time. Valid values:
  • CRITICAL
  • WARN
  • INFO
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 that was triggered last time. Valid values:
  • CRITICAL
  • WARN
  • INFO
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