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https://issues.apache.org/jira/browse/KAFKA-2419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14958978#comment-14958978
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Ismael Juma commented on KAFKA-2419:
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[~aauradkar] Thanks for submitting a fix for `ExpireSensorTask` later.

Regarding the impact of this change on the new consumer, it seems to me that 
it's a bit of a shame to create one thread per consumer since we worked so hard 
to make it really cheap to create new consumers. Others have been more involved 
with the design of the new consumer so their opinion is more relevant, what are 
your thoughts [~hachikuji] [~guozhang] [~ewencp]?

> Allow certain Sensors to be garbage collected after inactivity
> --------------------------------------------------------------
>
>                 Key: KAFKA-2419
>                 URL: https://issues.apache.org/jira/browse/KAFKA-2419
>             Project: Kafka
>          Issue Type: New Feature
>    Affects Versions: 0.9.0.0
>            Reporter: Aditya Auradkar
>            Assignee: Aditya Auradkar
>            Priority: Blocker
>              Labels: quotas
>             Fix For: 0.9.0.0
>
>
> Currently, metrics cannot be removed once registered. 
> Implement a feature to remove certain sensors after a certain period of 
> inactivity (perhaps configurable).



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