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https://issues.apache.org/jira/browse/SOLR-8785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15684555#comment-15684555
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Walter Underwood commented on SOLR-8785:
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We built a servlet filter for Tomcat to do this kind of thing. Not too
complicated, but I'm not sure how general it is. It also has some New Relic
custom metrics.
We name the metrics as "corename.response.handlername". SolrJ goes to /select
and sends the handlername in a qt parameter, so we conflate that with requests
that go directly to the handler endpoint.
> Use Metrics library for core metrics
> ------------------------------------
>
> Key: SOLR-8785
> URL: https://issues.apache.org/jira/browse/SOLR-8785
> Project: Solr
> Issue Type: Improvement
> Affects Versions: 4.1
> Reporter: Jeff Wartes
> Labels: patch, patch-available
> Attachments: SOLR-8785-increment.patch, SOLR-8785.patch
>
>
> The Metrics library (https://dropwizard.github.io/metrics/3.1.0/) is a
> well-known way to track metrics about applications.
> In SOLR-1972, latency percentile tracking was added. The comment list is
> long, so here’s my synopsis:
> 1. An attempt was made to use the Metrics library
> 2. That attempt failed due to a memory leak in Metrics v2.1.1
> 3. Large parts of Metrics were then copied wholesale into the
> org.apache.solr.util.stats package space and that was used instead.
> Copy/pasting Metrics code into Solr may have been the correct solution at the
> time, but I submit that it isn’t correct any more.
> The leak in Metrics was fixed even before SOLR-1972 was released, and by
> copy/pasting a subset of the functionality, we miss access to other important
> things that the Metrics library provides, particularly the concept of a
> Reporter. (https://dropwizard.github.io/metrics/3.1.0/manual/core/#reporters)
> Further, Metrics v3.0.2 is already packaged with Solr anyway, because it’s
> used in two contrib modules. (map-reduce and morphines-core)
> I’m proposing that:
> 1. Metrics as bundled with Solr be upgraded to the current v3.1.2
> 2. Most of the org.apache.solr.util.stats package space be deleted outright,
> or gutted and replaced with simple calls to Metrics. Due to the copy/paste
> origin, the concepts should mostly map 1:1.
> I’d further recommend a usage pattern like:
> SharedMetricRegistries.getOrCreate(System.getProperty(“solr.metrics.registry”,
> “solr-registry”))
> There are all kinds of areas in Solr that could benefit from metrics tracking
> and reporting. This pattern allows diverse areas of code to track metrics
> within a single, named registry. This well-known-name then becomes a handle
> you can use to easily attach a Reporter and ship all of those metrics off-box.
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