Jan Høydahl created SOLR-18172:
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Summary: Declare OTEL metrics as BETA in Solr 10
Key: SOLR-18172
URL: https://issues.apache.org/jira/browse/SOLR-18172
Project: Solr
Issue Type: Bug
Components: metrics
Reporter: Jan Høydahl
Ref discussion
[https://lists.apache.org/thread/0d7fp80p39tfn95kdbq0fychjd1lsbl2]
In 10.0 we shipped a brand new metrics system powered by OTEL instrumentation.
It has diferent metric names, and is not backward compatible with the solr
exporter from 9.x
We are in the process of building some Grafana boards for it, which uncover
needs for some changes.
We decided to change internal and OTLP metric names from underscore to dot
separators (https://github.com/apache/solr/pull/4223) to align with OTEL
semantic conventions.
We found two metrics that are pure duplicates with different names.
Clearly, there is a need for some changes and stabilization of this brand new
feature.
Looking back we should have declared the feature as BETA and experimental in
10.0, but we did not.
I therefore propose that we declare it a BETA feature now, by adding a
disclaimer in Ref Guide and send an [ANNOUNCE] email to the lists.
As 10.0 is still brand new and likely not yet in production many places, and
even fewer depending on the new metrics names, we could retroactively delcare
it BETA from version 10.0.
That will allow us to tweak things in the next few minor versions. Perhaps we
want to rename a few metrics with better names. Perhaps some need to change
slightly.
It is unfortunate to do such things after a release, but it is better to do it
now when 19.0 is still fresh. The longer we wait the harder to justify changes.
If the PMC agrees (I don't think we need a vote), I can draft an announce mail
and a PR against branch_10_0 ref guide.
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