Pierre Salagnac created SOLR-17777:
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Summary: After core deletion, we keep an empty metric registry for
this core
Key: SOLR-17777
URL: https://issues.apache.org/jira/browse/SOLR-17777
Project: Solr
Issue Type: Bug
Components: metrics
Affects Versions: 9.8
Reporter: Pierre Salagnac
I accidentally spotted a memory leak in metric registries. When a core is
unloaded/deleted, we keep an empty metric registry for this core.
This might have some very minor memory impacts if there is a very large number
of collection creations and deletions, or core splits and moves during the
server lifespan.
This happens in {{SolrMetricManager.unregisterGauges()}} which is invoked after
the registry was already dropped. As a side effect, this method recreates an
empty registry.
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