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https://issues.apache.org/jira/browse/SOLR-11778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16350243#comment-16350243
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ASF subversion and git services commented on SOLR-11778:
--------------------------------------------------------

Commit 8d27412e5afd82b17b3c25ad8aa29d11fba662c6 in lucene-solr's branch 
refs/heads/master from [~ab]
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=8d27412 ]

SOLR-11778 Add per-stage RequestHandler metrics.


> Add per-stage RequestHandler metrics
> ------------------------------------
>
>                 Key: SOLR-11778
>                 URL: https://issues.apache.org/jira/browse/SOLR-11778
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: metrics
>            Reporter: Andrzej Bialecki 
>            Assignee: Andrzej Bialecki 
>            Priority: Major
>         Attachments: SOLR-11778.patch
>
>
> Currently {{RequestHandlerBase}} defines several metrics for keeping track of 
> general-purpose requests. These metrics are also used in {{SearchHandler}}.
> However, query processing in SolrCloud consists of several (varying) stages, 
> and each of these stages may result in additional shard requests. These 
> details are not captured by the metrics, because they treat all requests the 
> same way.
> In some applications it's important to know how many requests are user 
> requests, and how many of them are generated internally by SolrCloud - for 
> example, when diagnosing uneven distribution of requests across shards, or 
> when autoscaling framework wants to detect "hot replicas". If we split the 
> metrics at least into distributed vs. non-distributed requests then the 
> numbers become more meaningful and representative of the global load vs. 
> local load.



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