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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