[jira] [Created] (SOLR-18165) Use dot separated metric names for OTLP

["Jan Høydahl (Jira)" <ji...@apache.org>]

Jan Høydahl created SOLR-18165:
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             Summary: Use dot separated metric names for OTLP
                 Key: SOLR-18165
                 URL: https://issues.apache.org/jira/browse/SOLR-18165
             Project: Solr
          Issue Type: Bug
          Components: metrics
    Affects Versions: 10.0
            Reporter: Jan Høydahl


In v 10.0 we switched to OTEL for metrics with new sets of metric names compared to 9.x. We currently use underscore_separated_names for metrics.

The OTEL convention is to use dot.separated.names for metrics. See [https://opentelemetry.io/docs/specs/semconv/general/naming/]

As it was a mistake to use underscores everywhere in 10.0, this issue will fix the naming to comply with conventions.
h2. Consequences
 * The prometheus metrics endpoints will *NOT* be changed, will still export prometheus style underscore separated metric names
 * The OTLP metric exporter WILL change, which is a backward compatibility break. But few people use v10.0.0 and even fewer have started depending on underscores downstream, and those who do can write a transformer rule in OTEL Collector that use underscores

 



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