Create an alert rule

Procedure

1. Log on to the Cloud Monitor console.

2. In the left-side navigation pane, choose Cloud Resource Monitoring > Application Groups.

3. On the Application Groups tab, click the name of the application group.

4. In the left-side navigation pane, click Alert Rules.

5. Click Create Alert Rule.

6. In the Create Alert Rule panel, configure the parameters. The following table describes the parameters.

   Parameter	Description
   Product	An Alibaba Cloud service monitored by Cloud Monitor. Example: ApsaraDB RDS.
   Resource Range	Scope of resources for this alert rule. Valid values: All Resources: Applies to all resources of the specified product, including resources added later. Application Groups: Applies to all resources in the specified application group of the selected product, including resources added later. Instances: Applies to the specified resource of the selected product only.
   Rule Description	Defines when Cloud Monitor triggers an alert. To configure: Click Add Rule and select a metric type. In the Configure Rule Description panel, enter a Alert Rule, then define the rule conditions. Simple Metric: Select a metric, then set its threshold and alert level. Alert levels use an escalations model. When the threshold reaches a specific level, only that level is triggered; other levels are not triggered simultaneously. For example, if the threshold directly reaches Critical, only the Critical alert is triggered, and the Info and Warning alerts are not triggered at the same time. Combined Metrics: Select an alert level, then define an alert condition using two or more metrics. Note Multi-metric alert rules require the target resource to report data for every included metric. For example, if the rule includes a public network metric but the ECS instance has no public IP address, the alert does not trigger. By default, a multi-metric alert rule triggers an alert only when all metrics meet their conditions. This means every metric must reach its threshold at the same time. To trigger an alert when any one metric reaches its threshold, change the metric relationship to the option that triggers on any satisfied condition. Expression: Select an alert level, then define an alert expression. Dynamic Threshold: Smart threshold details: Overview | Create a smart threshold alert rule. The alert level determines the notification method used when an alert occurs. Only the Critical level supports phone call notifications. The Warning and Info levels do not support phone call notifications. The following table lists the notification methods supported by each alert level. Alert level Notification method Critical (Critical) Phone call + text message + email + Webhook Warning (Warn) Text message + email + Webhook Info (Info) Email + Webhook Note Complex alert expressions: Alert rule expression reference.
   Mute Period	Interval between repeated alert notifications when an alert remains active and unacknowledged. Valid values: 5 minutes, 15 minutes, 30 minutes, 60 minutes, 3 hours, 6 hours, 12 hours, and 24 hours. When a metric crosses its alert threshold, Cloud Monitor sends an alert. No additional alerts are sent during the mute period. After the mute period ends, if the metric still exceeds the threshold, Cloud Monitor sends another alert. For example, if you set the Mute Period to 12 hours and the alert remains active, Cloud Monitor sends another alert 12 hours later.
   Effective Period	The time range during which the alert rule is active. Alerts are sent only during this period. Note Outside the effective period, alerts are not sent, but alert history records still appear in the alert history list.
   Alert Contact Group	The group of contacts who receive alert notifications. An alert contact group contains one or more alert contacts. Notifications for an application group are sent to all contacts in this group. To create contacts or groups, see Create an alert contact or alert contact group. Phone calls are sent by default for Critical (Critical) alert notifications. To turn off phone calls, select the warning level Warning (Warn) or Info (Info), or remove the contacts who receive phone calls from the alert contact group. The notification method for Warning (Warn) is text message, email, and Webhook. The notification method for Info (Info) is email and Webhook. Alert rules do not support custom notification content or templates. To use custom notification templates with multiple channels (such as DingTalk, Feishu/Lark, and email) and variable-based content, use the notification template management feature of Cloud Monitor 2.0. In the Cloud Monitor console, choose Alert Center > Notification Management > Notification Templates.
   Tag	A tag for the alert rule. Each tag has a name and a value. Note You can add up to six tags.
   Alert Callback	A publicly accessible URL that receives alert data from Cloud Monitor via HTTP POST requests. Only HTTP is supported. Use threshold-based alert callbacks. To test connectivity to the callback URL: Click Test, located directly to the right of the callback URL. In the WebHook Test panel, check the HTTP status code and test result details to verify connectivity. Note You can also set the Test Template Type: and Language:. Then click Test again to view updated test results. Click Close. Note Click Advanced Settings to configure this parameter.
   Auto Scaling	If you enable Auto Scaling, Cloud Monitor triggers the associated scaling rule when an alert occurs. You must specify the Region, ESS Group, and ESS Rule. Configure a scaling group. Configure a scaling rule. Note Click Advanced Settings to configure this parameter.
   Simple Log Service	If you enable Simple Log Service, Cloud Monitor sends alert data to a Logstore in Simple Log Service (SLS) when an alert occurs. You must specify the Region, ProjectName, and Logstore. Collect and analyze ECS text logs using LoongCollector. Note Click Advanced Settings to configure this parameter.
   Simple Message Queue (formerly MNS) - Topic	If you enable Simple Message Queue (formerly MNS) - Topic, Cloud Monitor sends alert data to a Message Service (MNS) topic when an alert occurs. You must specify the region and topic. Create a topic. Note Click Advanced Settings to configure this parameter.
   Function Compute	If you enable Function Compute, Cloud Monitor sends alert notifications to Function Compute (FC) for custom formatting when an alert occurs. You must specify the region, service, and function. Quickly create a function. Note Click Advanced Settings to configure this parameter.
   Method to handle alerts when no monitoring data is found	How Cloud Monitor handles alerts when no monitoring data is available. Valid values: Do not do anything (default) Send alert notifications After you select this option, a no-data alert is triggered when the metric has no data for 10 consecutive collection periods. The default collection period is 1 minute (configurable through the Period parameter), so the alert is triggered about 10 minutes later. Treated as normal Note Click Advanced Settings to configure this parameter.

7. Click Confirm.