Configuring a Kafka Alarm Rule

This section describes the alarm rules of some metrics and how to configure them. In actual services, you are advised to configure alarm rules for metrics based on the following alarm policies:

**Table 1** Alarm policies and handling of Kafka instances
Metric ID	Metric	Monitored Object	Alarm Policy	Description	Handling Suggestion
broker_disk_usage	Disk Capacity Usage	Broker	Alarm threshold: original value > 80% Number of consecutive periods: 1 Alarm severity: critical	Disk usage of the Kafka VM	Modify the instance storage space. For details, see Modifying Instance Specifications.
broker_cpu_core_load	Average Load per CPU Core	Broker	Alarm threshold: original value > 2 Number of consecutive periods: 3 Alarm severity: major	Average load of each CPU core of the Kafka VM.	Check whether the metric has been approaching or exceeding the alarm threshold for a long time. If yes, modify the number of brokers. For details, see Modifying Instance Specifications.
broker_memory_usage	Memory Usage	Broker	Alarm threshold: original value > 90% Number of consecutive periods: 3 Alarm severity: critical	Memory usage of the Kafka VM.	Modify the number of brokers. For details, see Modifying Instance Specifications.
current_partitions	Partitions	Instance	Alarm threshold: original value > 90% of the maximum allowed number of partitions. The partition limit varies depending on instance specifications. For details, see Specifications. Number of consecutive periods: 1 Alarm severity: major	Number of used partitions in the instance.	If new topics are required, modify the number of brokers, or split the service to multiple instances. For details about how to modify the number of brokers, see Modifying Instance Specifications.
broker_cpu_usage	CPU Usage	Broker	Alarm threshold: original value > 90% Number of consecutive periods: 3 Alarm severity: major	CPU usage of the Kafka VM.	Check whether the metric has been approaching or exceeding the alarm threshold for a long time. If yes, modify the number of brokers. For details, see Modifying Instance Specifications.
group_msgs	Accumulated Messages	Instance	Alarm threshold: original value > 90% of the upper limit. The upper limit is customized. Number of consecutive periods: 1 Alarm severity: major	Total number of accumulated messages in all consumer groups of the instance	Delete idle consumer groups, if any. You can also accelerate message retrieval, for example, by increasing the number of consumers.
topic_messages_remained	Topic Available Messages	Consumer group	Alarm threshold: original value > 90% of the upper limit. The upper limit is customized. Number of consecutive periods: 1 Alarm severity: major	Number of remaining messages that can be retrieved from the specified topic in the consumer group.	Check whether the consumer code logic is correct, for example, by checking whether the consumer stops consuming messages due to an exception. You can also accelerate message retrieval, for example, by adding topic consumers. Ensure that the number of partitions is greater than or equal to the number of consumers.

Procedure

Log in to the console.
Click in the upper left corner to select a region.

Select the region where your Kafka instance is located.
Click and choose Application > Distributed Message Service (for Kafka) to open the console of DMS for Kafka.
Go to the monitoring page in either of the following ways:
- Click View Metric in the row containing the desired Kafka instance.
- Click the desired Kafka instance to go to the instance details page. Choose Monitoring in the navigation pane.
Hover the mouse pointer over a metric and click to create an alarm rule for the metric. The Create Alarm Rule page is displayed.
Specify the alarm details.

For more information about creating alarm rules, see Creating an Alarm Rule.
1. Set the alarm name and description.
2. Set the alarm policy.
  As shown in the following figure, if the original disk capacity usage is equal to or higher than 85% for three consecutive periods, an alarm is generated. If the alarm is not handled on time, an alarm notification is sent.
  
  Figure 1 Setting the alarm policy and alarm severity
3. Set the alarm notification configurations.
  If you enable Alarm Notification, specify Notification Window, Notification Object, and Trigger Condition.
4. Click Create.