FWIW: that log message was added to branch_8x by 3c02c9197376 as part of SOLR-15052 ... it's based on master commit 8505d4d416fd -- but that does not add that same logging message ... so it definitely smells like a mistake to me that 8x would add this INFO level log message that master doesn't have.
it's worth noting that 3c02c9197376 included many other "log.info(...)" messages that had 'nocommit' comments to change them to debug later ... making me more confident this is a mistake... https://issues.apache.org/jira/browse/SOLR-15136 : Date: Thu, 4 Feb 2021 12:45:16 +0100 : From: Markus Jelsma <markus.jel...@openindex.io> : Reply-To: solr-user@lucene.apache.org : To: solr-user@lucene.apache.org : Subject: Excessive logging 8.8.0 : : Hello all, : : We upgraded some nodes to 8.8.0 and notice there is excessive logging on : INFO when some traffic/indexing is going on: : : 2021-02-04 11:42:48.535 INFO (qtp261748192-268) [c:data s:shard2 : r:core_node4 x:data_shard2_replica_t2] o.a.s.c.c.ZkStateReader already : watching , added to s : tateWatchers : : Is this to be expected? : : Thanks, : Markus : -Hoss http://www.lucidworks.com/