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https://issues.apache.org/jira/browse/KAFKA-3027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15067445#comment-15067445
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Jay Kreps commented on KAFKA-3027:
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The window should advance either when an update comes or when the value is read
(e.g. SampledStat.measure()), is that not happening?
> Kafka metrics can be stale if there is no new update
> ----------------------------------------------------
>
> Key: KAFKA-3027
> URL: https://issues.apache.org/jira/browse/KAFKA-3027
> Project: Kafka
> Issue Type: Bug
> Components: clients
> Affects Versions: 0.8.2.0, 0.9.0.0
> Reporter: Jun Rao
>
> Currently, org.apache.kafka.common.metrics has the issue that the reported
> metric value can be stale if there is no new update. For example, in the
> producer, if no new data is sent to the producer instance, metrics such as
> record rate will be stale.
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