druid/docs/development/extensions-contrib/kafka-emitter.md

id	title
kafka-emitter	Kafka Emitter

To use this Apache Druid extension, include kafka-emitter in the extensions load list.

Introduction

This extension emits Druid metrics to Apache Kafka directly with JSON format.
Currently, Kafka has not only their nice ecosystem but also consumer API readily available. So, If you currently use Kafka, It's easy to integrate various tool or UI to monitor the status of your Druid cluster with this extension.

Configuration

All the configuration parameters for the Kafka emitter are under druid.emitter.kafka.

property	description	required?	default
druid.emitter.kafka.bootstrap.servers	Comma-separated Kafka broker. ([hostname:port],[hostname:port]...)	yes	none
druid.emitter.kafka.metric.topic	Kafka topic name for emitter's target to emit service metric.	yes	none
druid.emitter.kafka.alert.topic	Kafka topic name for emitter's target to emit alert.	yes	none
druid.emitter.kafka.request.topic	Kafka topic name for emitter's target to emit request logs. If left empty then request logs will not be sent to the Kafka topic.	no	none
druid.emitter.kafka.producer.config	JSON formatted configuration which user want to set additional properties to Kafka producer.	no	none
druid.emitter.kafka.clusterName	Optional value to specify name of your druid cluster. It can help make groups in your monitoring environment.	no	none

Example

druid.emitter.kafka.bootstrap.servers=hostname1:9092,hostname2:9092
druid.emitter.kafka.metric.topic=druid-metric
druid.emitter.kafka.alert.topic=druid-alert
druid.emitter.kafka.producer.config={"max.block.ms":10000}