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https://issues.apache.org/jira/browse/SOLR-16938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17765388#comment-17765388
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Alex Deparvu commented on SOLR-16938:
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I have merged the support for both solr.xml configs and auto-enabling based on
property existence. also manually cherry picked to 9.4 branch.
As an aside it is very strange that the 'NamedList' class which is something
that a plugin might need for implementing `init(NamedList<?> args)` sits in
solrj, so you have plugins depending on solrj because of one single class.
> Auto configure tracer without a <tracerConfig> tag in solr.xml
> --------------------------------------------------------------
>
> Key: SOLR-16938
> URL: https://issues.apache.org/jira/browse/SOLR-16938
> Project: Solr
> Issue Type: Improvement
> Components: tracing
> Reporter: Jan Høydahl
> Assignee: Alex Deparvu
> Priority: Major
> Time Spent: 1h
> Remaining Estimate: 0h
>
> Spinoff from SOLR-16536. It should now be possible to get rid of the explicit
> {{<tracerConfig>}} config in solr.xml and the pluggable
> {{TracerConfigurator}} class which is initialized in {{CoreContainer}}.
> Instead, the {{opentelemetry}} plugin can self-register statically to the
> global OTEL instance. This will make it sufficient to enable the
> {{opentelemetry}} module to enable tracing. You can also
> [enable/disable|https://opentelemetry.io/docs/specs/otel/configuration/sdk-environment-variables/]
> it with env {{OTEL_SDK_DISABLED}}.
> Alternatively, if we are getting away with global instance (SOLR-16937), then
> SolrCore could discover the plugin using SPI or similar as opposed to
> explicit editing of solr.xml.
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