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https://issues.apache.org/jira/browse/MESOS-4760?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15256760#comment-15256760
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Michael Browning commented on MESOS-4760:
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[~bernd-mesos], great, I'll get on that. One question to guide my
implementation: I discovered the need for this so that metrics could be
correctly implemented, but other than that, what was the motivation for
refactoring fetcher/agent/containerizer this way?
> Expose metrics and gauges for fetcher cache usage and hit rate
> --------------------------------------------------------------
>
> Key: MESOS-4760
> URL: https://issues.apache.org/jira/browse/MESOS-4760
> Project: Mesos
> Issue Type: Improvement
> Components: fetcher, statistics
> Reporter: Michael Browning
> Assignee: Michael Browning
> Priority: Minor
> Labels: features, fetcher, statistics, uber
>
> To evaluate the fetcher cache and calibrate the value of the
> fetcher_cache_size flag, it would be useful to have metrics and gauges on
> agents that expose operational statistics like cache hit rate, occupied cache
> size, and time spent downloading resources that were not present.
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