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https://issues.apache.org/jira/browse/SOLR-10654?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17799191#comment-17799191
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Matthew Biscocho commented on SOLR-10654:
-----------------------------------------
So I found some time to look more into a solution to implement these metrics
and ran into a few problems mostly around Solr metric collection with
Dropwizard.
I took a first approach by taking Solr Dropwizard Registry and coverting it
with a Util function from the prometheus client library to a Prometheus
Registry and use that output in new response writer I made. Doing so gave an
output that looks like so [^prometheus_metrics.txt].
I ran into the first issue in that 1 to 1 naming from Dropwizard isn't very
useful and doesn't follow [prometheus recommended naming convention.
|https://prometheus.io/docs/practices/naming/] The bigger issue is that
Dropwizard doesn't support tagging metrics and without tags/label essentially
makes these metrics useless for aggregation across Solr nodes.
So based on this, the only other way I can find to expose these metrics from
Solr was to either:
1. Create a separate [Prometheus
Registry|https://prometheus.github.io/client_java/getting-started/registry/]
next to the existing Dropwizard Registry and collect these Solr metrics in
parallel but with Prometheus having its own naming convention and applying
tags/labels
2. Possibly migrate off of Dropwizard and migrate to Micrometer as the new
default registry as it supports metric tagging. I did some research on
Micrometer and it looks to support [prometheus and a lot of other monitoring
systems|https://micrometer.io/docs/concepts#_supported_monitoring_systems]
making it possible to output micrometer in prometheus format.
I'm still newish to the Solr code base but was hoping to get someone who has
experience with metrics in Solr ( maybe [~dsmiley] ) to discuss possible other
approaches before going forward and help choose the best?
> Expose Metrics in Prometheus format DIRECTLY from Solr
> ------------------------------------------------------
>
> Key: SOLR-10654
> URL: https://issues.apache.org/jira/browse/SOLR-10654
> Project: Solr
> Issue Type: Improvement
> Components: metrics
> Reporter: Keith Laban
> Priority: Major
> Attachments: prometheus_metrics.txt
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Expose metrics via a `wt=prometheus` response type.
> Example scape_config in prometheus.yml:
> {code}
> scrape_configs:
> - job_name: 'solr'
> metrics_path: '/solr/admin/metrics'
> params:
> wt: ["prometheus"]
> static_configs:
> - targets: ['localhost:8983']
> {code}
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