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https://issues.apache.org/jira/browse/KAFKA-6040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16198397#comment-16198397
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Ismael Juma commented on KAFKA-6040:
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Retention is done on a partition, not topic, so the broker doesn't need to
maintain a topic size at the moment. The partition size is exposed via a Log
size metric
> Expose topic size for monitoring
> --------------------------------
>
> Key: KAFKA-6040
> URL: https://issues.apache.org/jira/browse/KAFKA-6040
> Project: Kafka
> Issue Type: New Feature
> Reporter: Michael Andre Pearce
>
> Currently it seems there is no monitoring endpoint of topic size, even though
> the cluster must calculate such estimation to maintain retention.size
> This is useful operationally to get understanding of actual topic usages,
> based on what the broker believes.
> As interim it seems some scripts exist to get this, but it would be ideal to
> get the value the broker believes/calculates.
> https://gist.github.com/kapkaev/ef633348dbecfedc0166
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