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https://issues.apache.org/jira/browse/SOLR-14837?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17223202#comment-17223202
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Jan Høydahl commented on SOLR-14837:
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Please supply a pull request with a fix, then we'll QA and merge the fix.
> prometheus-exporter: different metrics ports publishes mixed metrics
> --------------------------------------------------------------------
>
> Key: SOLR-14837
> URL: https://issues.apache.org/jira/browse/SOLR-14837
> Project: Solr
> Issue Type: Improvement
> Affects Versions: 8.6.2
> Reporter: Fadi Mohsen
> Priority: Minor
>
> when calling SolrExporter.main "pro-grammatically"/"same JVM" with two
> different solr masters asking to publish the metrics on two different ports,
> the metrics are being mixed on both metric endpoints from the two solr
> masters.
> This was tracked down to a static variable called *defaultRegistry*:
> https://github.com/apache/lucene-solr/blob/master/solr/contrib/prometheus-exporter/src/java/org/apache/solr/prometheus/exporter/SolrExporter.java#L86
> removing the static keyword fixes the issue.
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