Latest version: 4.1.x
Lenses works with any version of Apache Kafka 1.0 or later. All services: Kafka Brokers, Zookeepers, Schema Registries, Kafka Connect Clusters are automatically monitored.
- From the Header Bar Menu, go to the Dashboard panel.
- On the side navigation, select Services under the Monitor section.
Enabling JMX is recommended for advanced monitoring.
Lenses monitors (by default every 10 seconds) your entire streaming data platform infrastructure and has the following alert rules built-in:
|Rule||This rule fires when|
|Kafka broker is down||A Kafka broker from the cluster is not healthy|
|Zookeeper node is down||A Zookeeper node is not healthy|
|Connect Worker is down||A Kafka Connect worker node is not healthy|
|Schema Registry is down||A Schema Registry instance is not healthy|
|Under replicated partitions||The Kafka cluster has 1 or more under-replicated partitions|
|Partitions offline||The Kafka cluster has 1 or more partitions offline (partitions without an active leader)|
|Active Controller||The Kafka cluster has 0 or more than 1 active controllers|
|Multiple Broker versions||The Kafka cluster is under a version upgrade, and not all brokers have been upgraded|
|File-open descriptors on Brokers||A Kafka broker has an alarming number of file-open descriptors. When the operating system is exceeding 90% of the available open file descriptors|
|Average % the request handler is idle||The average fraction of time the request handler threads are idle is dangerously low. The alert is HIGH when the value is smaller than 10%, and CRITICAL when it is smaller than 2%.|
|Fetch requests failure||Fetch requests are failing. If the rate of failures per second is > 10% the alert level is set to CRITICAL, otherwise it is set to HIGH.|
|Produce requests failure||Producer requests are failing. When the value is > 10% the alert level is set to CRITICAL, otherwise it is set to HIGH.|
|Broker disk usage||A Kafka broker’s disk usage is greater than the cluster average. The build-in threshold is 1 GByte.|
|Leader imbalance||A Kafka broker has more leader replicas than the average broker in the cluster.|
If you change your Kafka cluster size, or replace an existing Kafka broker with another, Lenses will raise an active alert as it will detect that a broker of your Kafka cluster is no longer available. If the Kafka broker has been intentionally removed, then decommission it:
- Navigate to Services.
- Select the broker and click on the actions in the options menu and click on the Decommission option.
Kafka Consumer monitoring
Downstream failures of streaming data pipelines can be prevented by monitoring Kafka Consumers
Kafka Producer monitoring
Upstream failures of streaming data pipelines can be prevented by monitoring Kafka Producers
Lenses monitors the current metrics for each service providing like this a current health check state. If you wish to have historical data about the services, see the Grafana and Prometheus for Kafka section.