https://solr.apache.org/docs/10_0_0/core/org/apache/solr/logging/log4j2/Log4j2Watcher.Log4j2Appender.html
Log4j2Watcher.Log4j2Appender (Solr 10.0.0 core API)
declaration: package: org.apache.solr.logging.log4j2, class: Log4j2Watcher, class: Log4j2Appender
solrcoreapi