Kafka Metrics sampling

Apache Kafka exposes a lot of information via MBeans for the Producer, Consumer and Kafka Streams.

If you are looking to publish μ/log events into Kafka then have a look at the Kafka publisher. If instead you are looking to monitor Kafka applications, then you are in the right place.

To sample these metrics we can leverage μ/log MBean sampler:

;; Leiningen project
[com.brunobonacci/mulog-mbean-sampler "x.x.x"]

;; deps.edn format
{:deps { com.brunobonacci/mulog-mbean-sampler {:mvn/version "x.x.x"}}}

Current version:

This sampler uses the publisher infrastructure to sample MBeans values at regular intervals and publish them as μ/log events. The sampled events will be then published to all registered publisher and dispatched to third-party systems.

To capture everything:

(μ/start-publisher!
  {:type :mbean
   :mbeans-patterns ["kafka.*:*"]})

Or pick & choose:

(μ/start-publisher!
  {:type :mbean
   :mbeans-patterns ["kafka.producer:*"
                     "kafka.consumer:*"
                     "kafka.streams:*"]})

Here a list of patterns that can be used:

For Kafka Producers

• MBean: kafka.producer:type=producer-metrics,client-id=([-.w]+)
• MBean: kafka.producer:type=producer-metrics,client-id=([-.w]+)
• MBean: kafka.producer:type=producer-node-metrics,client-id=([-.w]+),node-id=([0-9]+)
• MBean: kafka.producer:type=producer-topic-metrics,client-id=([-.w]+),topic=([-.w]+)

For Kafka Consumers

• MBean: kafka.consumer:type=consumer-fetch-manager-metrics,client-id=([-.w]+)
• MBean: kafka.consumer:type=consumer-fetch-manager-metrics,client-id=([-.w]+),topic=([-.w]+)
• MBean: kafka.consumer:type=consumer-coordinator-metrics,client-id=([-.w]+)
• MBean: kafka.consumer:type=consumer-metrics,client-id=([-.w]+)
• MBean: kafka.consumer:type=consumer-metrics,client-id=([-.w]+)
• MBean: kafka.consumer:type=consumer-node-metrics,client-id=([-.w]+),node-id=([0-9]+)

For Kafka Streams apps

• MBean: kafka.streams:type=stream-metrics,client-id=[clientId]
• MBean: kafka.streams:type=stream-thread-metrics,thread-id=[threadId]
• MBean: kafka.streams:type=stream-task-metrics,thread-id=[threadId],task-id=[taskId]
• MBean: kafka.streams:type=stream-processor-node-metrics,thread-id=[threadId],task-id=[taskId],processor-node-id=[processorNodeId]
• MBean: kafka.streams:type=stream-state-metrics,thread-id=[threadId],task-id=[taskId],[storeType]-id=[storeName]
• MBean: kafka.streams:type=stream-state-metrics,thread-id=[threadId],task-id=[taskId],[storeType]-id=[storeName]
• MBean: kafka.streams:type=stream-record-cache-metrics,thread-id=[threadId],task-id=[taskId],record-cache-id=[storeName]

For more fine grained sampling please look at MBean sampler documentation.