Major Description
One example of a wasteful DEBUG log which could be moved to TRACE level is:
$ solr start -f -v 2018-04-05 22:46:14.488 INFO (main) [ ] o.a.s.c.SolrXmlConfig Loading container configuration from /opt/solr/server/solr/solr.xml 2018-04-05 22:46:14.574 DEBUG (main) [ ] o.a.s.c.Config null missing optional solr/@coreLoadThreads 2018-04-05 22:46:14.577 DEBUG (main) [ ] o.a.s.c.Config null missing optional solr/@persistent 2018-04-05 22:46:14.579 DEBUG (main) [ ] o.a.s.c.Config null missing optional solr/@sharedLib 2018-04-05 22:46:14.581 DEBUG (main) [ ] o.a.s.c.Config null missing optional solr/@zkHost 2018-04-05 22:46:14.583 DEBUG (main) [ ] o.a.s.c.Config null missing optional solr/cores 2018-04-05 22:46:14.605 DEBUG (main) [ ] o.a.s.c.Config null missing optional solr/transientCoreCacheFactory 2018-04-05 22:46:14.609 DEBUG (main) [ ] o.a.s.c.Config null missing optional solr/metrics/suppliers/counter 2018-04-05 22:46:14.609 DEBUG (main) [ ] o.a.s.c.Config null missing optional solr/metrics/suppliers/meter 2018-04-05 22:46:14.611 DEBUG (main) [ ] o.a.s.c.Config null missing optional solr/metrics/suppliers/timer 2018-04-05 22:46:14.612 DEBUG (main) [ ] o.a.s.c.Config null missing optional solr/metrics/suppliers/histogram 201
There are probably other examples as well.
