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Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).

Motivation

Describe the problems you are trying to solve.

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An important part of deploying Kafka Connect is monitoring the health of the workers in a cluster and the connectors and tasks that have been deployed to the cluster. The Kafka Connect framework only has a few metrics capturing the number of connectors and tasks for each worker, so we propose to add metrics to monitor more information about the connectors, tasks, and workers. This proposal expressly avoids changes to the Connect API, and therefore does not address how connector implementations can define their own connector-specific metrics.

Public Interfaces

All of the following will be added via Kafka's metrics library like most of the metrics in the Kafka brokers and other components.

Connector Metrics

Number of records (meter)

Rebalance Metrics

• rebalance duration (max, avg)
• last rebalance time
• rebalance count

kafka.connect:type=connect-coordinator-metrics,name=assigned-connectors

Briefly list any new interfaces that will be introduced as part of this proposal or any existing interfaces that will be removed or changed. The purpose of this section is to concisely call out the public contract that will come along with this feature.

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