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https://issues.apache.org/jira/browse/SOLR-14914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17215363#comment-17215363
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David Smiley commented on SOLR-14914:
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I just looked at the docs, which seem fine to me, and so I'm puzzled at what
Noble said. It's not a lot of docs but it's rather simple to use so I don't
know what's missing. I also think 99% of people should leave it be (enabled),
and so I consider this an advanced option, and thus being economical on docs
for this is totally fine.
> Add option to disable metrics collection
> ----------------------------------------
>
> Key: SOLR-14914
> URL: https://issues.apache.org/jira/browse/SOLR-14914
> Project: Solr
> Issue Type: Improvement
> Components: metrics
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Priority: Major
> Fix For: 8.7
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> Some users have expressed concerns about the overhead of metrics collection,
> and consequently the need to have an option to turn off the metrics
> collection altogether.
> Metrics instrumentation in Solr cannot be itself easily removed or bypassed -
> in order to provide fine-grained metrics many code paths had to be changed
> and they now expect the metrics to be present (non-null). However, we can use
> the mechanism of {{MetricSupplier}} to provide singleton no-op
> implementations of all metrics, which would reduce the CPU overhead to
> basically the cost of an empty method call, and the memory overhead to a
> HashMap entry in a {{MetricRegistry}} (metric names still need to be tracked).
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