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https://issues.apache.org/jira/browse/MESOS-1283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14703289#comment-14703289
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Greg Mann commented on MESOS-1283:
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Thanks [~bmahler], I checked out the metric classes and I see what you mean; we 
ask for a window to initialize the metric, and default to {{None()}} if it 
isn't provided, leading to a metric with no history. As long as we're happy 
with that default behavior, this environment variable would seem to be 
unnecessary now; at the very least I can submit a patch to clean up its 
remnants.

> reintroduce LIBPROCESS_STATISTICS_WINDOW
> ----------------------------------------
>
>                 Key: MESOS-1283
>                 URL: https://issues.apache.org/jira/browse/MESOS-1283
>             Project: Mesos
>          Issue Type: Task
>            Reporter: Dominic Hamon
>            Assignee: Greg Mann
>            Priority: Minor
>              Labels: mesosphere
>
> LIBPROCESS_STATISTICS_WINDOW used to be used to override the default history 
> window duration for statistics - it should be reintroduced and plumbed 
> through to metrics.



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