CloudMonitor can report alerts by using emails and DingTalk chatbots. CloudMonitor can also report alerts by using the alert callback feature. This allows to you to handle alerts in a more flexible way. This topic describes how to use the alert callback feature to send notifications about threshold-triggered alerts to your existing operations and maintenance (O&M) or notification system.

Prerequisites

The callback URL that can be accessed over the Internet is prepared. Use the URL of the O&M or notification system as the callback URL.

Background information

CloudMonitor pushes alert notifications to the specified URL by sending HTTP POST requests. You must add the following IP addresses to the whitelist of your firewall: 47.74.206.0/26, 47.74.206.64/26, 47.74.206.128/26, and 47.74.206.192/26. You can take actions based on the received notifications.

If an alert callback fails, three retries are performed. Each callback request times out after 5 seconds.

Procedure

  1. Log on to the CloudMonitor 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 threshold-triggered alert rule that you want to modify and click Modify in the Actions column.
    Note You can also create a threshold-triggered alert rule. For more information, see Create a threshold-triggered alert rule.
  4. On the Create Alert Rule page, enter the callback URL.
  5. Click Confirm.

Result

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

Parameter 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 rule.
  • 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. For more information about metric names, see Appendix 1: Metrics.
metricProject String The name of the service. The value of this parameter is the same as that of the namespace parameter. For more information about service names, see Appendix 1: Metrics.
namespace String The namespace of the service. The value of this parameter is the same as that of the metricProject parameter. For more information about the namespaces of services, see Appendix 1: Metrics.
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 this time. Valid values:
  • CRITICAL
  • WARN
  • INFO
userId String The ID of the user.
Sample HTTP 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