Sorry for the bad format of the first mail, once again: Hello there, while playing around with the https://github.com/apache/lucene-solr/blob/master/solr/contrib/prometheus-exporter/conf/solr-exporter-config.xml I found a bug when trying to use string arrays like 'facet.field': Exception occures on solr-8.4.1: _ERROR - 2020-11-03 17:21:07.742; org.apache.solr.prometheus.exporter.SolrExporter; Could not load scrape configuration from %s_ _Exception in thread "main" java.lang.RuntimeException: java.lang.ClassCastException: class java.util.ArrayList cannot be cast to class java.lang.String (java.util.ArrayList and java.lang.String are in module java.base of loader 'bootstrap')_ _at org.apache.solr.prometheus.exporter.SolrExporter.loadMetricsConfiguration(SolrExporter.java:223)_ _at org.apache.solr.prometheus.exporter.SolrExporter.main(SolrExporter.java:205)_ I have seen the bug is still there on master branch. I can provide a patch for the bugfix. Can I create an issue or do you know about it? (https://issues.apache.org/jira/secure/CreateIssue.jspa) Regards, Max
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