Alert Reference

This page describes the alert references for Lenses.

Use this reference to map each alert to its identifier, category, instance field, and severity.

Alert	Alert Identifier	Description	Category	Instance	Severity
Kafka Broker is down	1000	Raised when the Kafka broker is not part of the cluster for at least 1 minute. Example: host-1, host-2.	Infrastructure	brokerID	INFO, CRITICAL
Zookeeper Node is down	1001	Raised when the Zookeeper node is not reachable. This information is based on Zookeeper JMX. If it responds to JMX queries, it is considered to be running.	Infrastructure	service name	INFO, CRITICAL
Connect Worker is down	1002	Raised when the Kafka Connect worker is not responding to the /connectors API call for more than 1 minute.	Infrastructure	worker URL	MEDIUM
Schema Registry is down	1003	Raised when the Schema Registry node is not responding to the root API call for more than 1 minute.	Infrastructure	service URL	HIGH, INFO
Under replicated partitions	1005	Raised when there are topic partitions not meeting the configured replication factor.	Infrastructure	partitions	HIGH, INFO
Partitions offline	1006	Raised when there are partitions without an active leader. These partitions are not readable or writable.	Infrastructure	brokers	HIGH, INFO
Active Controllers	1007	Raised when the number of active controllers is not 1. Each cluster should have exactly one controller.	Infrastructure	brokers	HIGH, INFO
Multiple Broker Versions	1008	Raised when brokers in the cluster are running different Kafka versions.	Infrastructure	brokers versions	HIGH, INFO
File-open descriptors high capacity on Brokers	1009	Raised when a broker has too many open file descriptors.	Infrastructure	brokerID	HIGH, INFO, CRITICAL
Average % the request handler is idle	1010	Raised when the average fraction of time the request handler threads are idle falls below the threshold. When the value is smaller than 0.02, the alert level is CRITICAL. When the value is smaller than 0.1, the alert level is HIGH.	Infrastructure	brokerID	HIGH, INFO, CRITICAL
Fetch requests failure	1011	Raised when the failed Fetch request rate per second is greater than a threshold. If the value is greater than 0.1, the alert level is CRITICAL. Otherwise, it is HIGH.	Infrastructure	brokerID	HIGH, INFO, CRITICAL
Produce requests failure	1012	Raised when the failed Produce request rate per second is greater than a threshold. If the value is greater than 0.1, the alert level is CRITICAL. Otherwise, it is HIGH.	Infrastructure	brokerID	HIGH, INFO, CRITICAL
Broker disk usage is greater than the cluster average	1013	Raised when a Kafka broker's disk usage is greater than the cluster average. The default threshold is 1 GB of disk usage.	Infrastructure	brokerID	MEDIUM, INFO
Leader Imbalance	1014	Raised when a Kafka broker has more leader replicas than the cluster average.	Infrastructure	brokerID	INFO
Consumer Lag exceeded	2000	Raises an alert when consumer lag exceeds the threshold on any partition.	Consumers	topic	HIGH, INFO
Connector deleted	3000	Raised when a connector was deleted.	Kafka Connect	connector name	INFO
Topic has been created	4000	Raised when a new topic was added.	Topics	topic	INFO
Topic has been deleted	4001	Raised when a topic was deleted.	Topics	topic	INFO
Topic data has been deleted	4002	Raised when records from a topic were deleted.	Topics	topic	INFO
Data Produced	5000	Raises an alert when the data produced on a topic does not match the expected threshold.	Data Produced	topic	LOW, INFO
Connector Failed	6000	Raises an alert when a connector, or any worker in a connector, is down.	Apps	connector	LOW, INFO