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https://issues.apache.org/jira/browse/SOLR-15416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17534989#comment-17534989
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ASF subversion and git services commented on SOLR-15416:
--------------------------------------------------------

Commit 10d80885eb97f7e85e3498035cdf647081b37411 in solr's branch 
refs/heads/branch_9x from Jason Gerlowski
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=10d80885eb9 ]

SOLR-15746: Remove unused metrics.history apispec (#853)

The "metrics history" feature was removed as a part of SOLR-15416, but
the apispec file was missed during that effort.  This commit removes it.

> Remove metrics history collection (and MetricsHistoryHandler)
> -------------------------------------------------------------
>
>                 Key: SOLR-15416
>                 URL: https://issues.apache.org/jira/browse/SOLR-15416
>             Project: Solr
>          Issue Type: Improvement
>          Components: metrics
>            Reporter: Andrzej Bialecki
>            Assignee: Andrzej Bialecki
>            Priority: Major
>             Fix For: 9.0, 8.9
>
>         Attachments: SOLR-15416-8x.patch, SOLR-15416.patch
>
>
> Originally this functionality was meant to one day support more intelligent 
> decisions in the autoscaling triggers that would react to the dynamics of the 
> metrics changes. For this reason it was useful to keep track of the changes 
> in the key metrics over time, without depending on any external systems.
> With the removal of autoscaling the usefulness of this handler (and the 
> collection of metrics history inside Solr) is questionable.
> I propose to remove it in 9.0.



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