The Collector exposes the same name multiple times: jvm_classes_loaded

[fmmr]

Upgrading to 0.12.0 causes our apps to crash with the following error. This looks related to the note on the release note from 0.12.0. 0.11.0 works like a charm:

Caused by: java.lang.IllegalArgumentException: Failed to register Collector of type ClassLoadingExports: The Collector exposes the same name multiple times: jvm_classes_loaded
at io.prometheus.client.CollectorRegistry.assertNoDuplicateNames(CollectorRegistry.java:71)
at io.prometheus.client.CollectorRegistry.register(CollectorRegistry.java:51)
at io.prometheus.client.Collector.register(Collector.java:308)
at io.prometheus.client.hotspot.DefaultExports.register(DefaultExports.java:43)
at io.prometheus.client.hotspot.DefaultExports.initialize(DefaultExports.java:28)
at no.finntech.search.solr.searchhandler.PrometheusResponseWriter.(PrometheusResponseWriter.java:27)
... 19 more

One example is trying to start SOLR with prometheus included, and a call to hotspot:DefaultExports.initialize()

[fmmr]

ok - I think this was multiple different cases of simpleclient_hotspot being included with the simpleclient 0.12.0.