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https://issues.apache.org/jira/browse/SOLR-12564?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Pugh resolved SOLR-12564.
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Resolution: Won't Fix
We've moved away from the Prometheus Exporter in Solr 9.9/Solr 10 releases..
> Full support for histogram and summary metric types in Prometheus exporter
> --------------------------------------------------------------------------
>
> Key: SOLR-12564
> URL: https://issues.apache.org/jira/browse/SOLR-12564
> Project: Solr
> Issue Type: Improvement
> Components: contrib - prometheus-exporter, metrics
> Affects Versions: 7.3.1
> Reporter: Michał Politowski
> Priority: Minor
>
> The Prometheus metrics exporter in contrib does not support exposing complex
> metrics types: histograms and summaries. In particular request times metrics
> in Solr provide quantile values, which could be exposed as a Prometheus
> summary.
> These complex types are represented in the Prometheus wire format as multiple
> samples with different, related names, which should be produced in a
> particular order under a common header as described in
> [https://prometheus.io/docs/instrumenting/exposition_formats/]
> The current Solr Prometheus exporter is able to produce any required sample
> lines, but not to group them as specified.
> This is only a minor issue for now, as Prometheus currently seems to ignore
> these constraints (and metrics types in general) itself, but this may change
> in the future (as stated eg. in
> [https://prometheus.io/docs/concepts/metric_types/])
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