Use the alert callback feature to send notifications about threshold-triggered alerts - CloudMonitor

CloudMonitor can send alerts by using emails or webhooks. CloudMonitor can also send alerts by using the alert callback feature. You can handle alerts flexibly. This topic describes how to use the alert callback feature to send notifications about threshold-triggered alerts to your O&M system or notification system.

Prerequisites

The public URL of your O&M system or notification system is available. The URL can be used to access your O&M system or notification system.

Background information

CloudMonitor sends alert notifications to the specified URL by using the HTTP or HTTPS POST method. You must add the following CIDR blocks to the whitelist of your firewall: 47.74.206.0/26, 47.74.206.64/26, 47.74.206.128/26, 47.74.206.192/26, and 8.222.159.116. After you receive alert notifications, you can resolve issues based on the content of the alert notifications.

If an alert callback fails, CloudMonitor retries up to three times. The timeout period of each callback request is 5 seconds.

You cannot configure multiple threshold-triggered alert callbacks at a time in the CloudMonitor console. To configure multiple threshold-triggered alert callbacks, perform the following steps:

Call the CreateMetricRuleTemplate operation to create an alert template, specify a callback URL, and then call the ApplyMetricRuleTemplate operation to apply the alert template to a specified application group. For more information, see CreateMetricRuleTemplate and ApplyMetricRuleTemplate.
Call the PutGroupMetricRule operation to create an alert rule for or modify the alert rule of the application group, and specify a callback URL. For more information, see PutGroupMetricRule.

Procedure

Log on to the CloudMonitor console.
In the left-side navigation pane, choose Alerts > Alert Rules.
On the Alert Rules 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. For more information, see Create an alert rule.
In the Modify Alert Rule panel, enter a callback URL in the Alert Callback field.
To test the connectivity of an alert callback URL, perform the following steps:
1. Click Test next to the callback URL.
  In the Webhook Test panel, you can check and troubleshoot the connectivity of the alert callback URL based on the returned status code and test result details.
  Note
  To obtain the details of the test result, configure the Test Template Type and Language parameters and click Test.
2. Click Close.
Click Confirm.

Result

If the alert rule is triggered, CloudMonitor sends an alert notification to the callback URL by using the HTTP or HTTPS POST method. The following table describes the parameters that are configured in the POST request.

Note

Parameters may be added to the POST request. Your webhook must be compatible with the new parameters.

Parameter	Data type	Description
alertName	String	The alert name.
alertState	String	The alert status. Valid values: OK: normal. ALERT: The alert is triggered. INSUFFICIENT_DATA: No data is found.
curValue	String	The value of the metric when the alert is triggered or cleared. The metric is specified in the alert rule based on which the alert is triggered.
dimensions	String	The object for which the alert is triggered. Example: `{userId=110803419679**, instanceId=i-8psdh7l6lphbn10l**}`.
expression	String	The alert conditions.
groupId	String	The ID of the application group.
instanceName	String	The instance name.
lastTime	String	The alert duration. Unit: minutes.
metricName	String	The metric name. For more information about metric names, see the Metric Name parameter in Appendix 1: Metrics.
metricProject	String	The name of the cloud service. `metricProject` is the same as `namespace`. For more information about the names of cloud services, see Appendix 1: Metrics.
namespace	String	The namespace of the cloud service. The callback `namespace` is the same as `metricProject` for most cloud services. For more information about the namespaces of cloud services, see Appendix 1: Metrics. The namespaces of a few cloud services are different from the callback `namespace`. For more information about the mappings, see Table 1. Mappings between the namespaces of cloud services and callback namespaces.
preTriggerLevel	String	The severity level of the alert that is last triggered. Valid values: CRITICAL WARN INFO
productGroupName	String	The name of the application group.
rawMetricName	String	The metric ID. For more information about metric IDs, see the Metric Id parameter in Appendix 1: Metrics.
regionId	String	The region ID.
regionName	String	The region name.
ruleId	String	The ID of the alert rule based on which the current alert is triggered.
timestamp	String	The time when the current alert is triggered. The value is a timestamp.
transId	String	The ID of the resource in the rule from the time when an alert is triggered to the time when the alert is cleared.
triggerLevel	String	The severity level of the current alert. Valid values: CRITICAL WARN INFO
unit	String	The unit of the metric. For more information about the units of metrics, see the Unit parameter in Appendix 1: Metrics.
userId	String	The user ID.

Table 1. Mappings between the namespaces of cloud services and callback namespaces

Namespace of a cloud service	Callback namespace
acs_ecs_dashboard	acs_ecs
acs_slb_dashboard	acs_slb
acs_rds_dashboard	acs_rds
acs_oss_dashboard	acs_oss
acs_sls_dashboard	acs_sls
acs_ess_dashboard	acs_ess
acs_containerservice_dashboard	acs_containerservice
acs_apigateway_dashboard	acs_apigateway
acs_redis_dashboard	acs_kvstore
acs_ocs_new	acs_ocs
acs_mns_new	acs_mns

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=110803419679****&curValue=97.39&alertName=Basic monitoring-ECS-Memory usage&namespace=acs_ecs_dashboard&triggerLevel=WARN&alertState=ALERT&preTriggerLevel=WARN&ruleId=applyTemplateee147e59-664f-4033-a1be-e9595746****&dimensions={userId=110803419679****, instanceId=i-8psdh7l6lphbn10l****}&timestamp=1508136760&productGroupName=test_Group&groupId=1666****&lastTime=2 minutes&rawMetricName=cpu_total&regionId=cn-hangzhou&regionName=China (Hangzhou)&transId=53767d2a-ae72-11ed-b2ca-00163e2c****&unit=%