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

  1. Log in to the console.

  2. Click image1 in the upper left corner to select a region.

    Note

    Select the region where your Kafka instance is located.

  3. Click Service List and choose Application > Distributed Message Service. The Kafka instance list is displayed.

  4. 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.

  5. Hover the mouse pointer over a metric and click image2 to create an alarm rule for the metric. The Create Alarm Rule page is displayed.

  6. 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

      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.