[jira] [Created] (SOLR-12564) Full support for histogram and summary metric types in Prometheus exporter

["Michał Politowski (JIRA)" <ji...@apache.org>]

Michał Politowski created SOLR-12564:
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             Summary: 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
      Security Level: Public (Default Security Level. Issues are Public)
    Affects Versions: 7.3.1
            Reporter: Michał Politowski


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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