It is a pleasure to inform you that the new version of the Solr search server has been released. It is the next release from the 8.x branch and it is numbered 8.7.0.
One of the changes that was introduces is the circuit breaker infrastructure and implementation based on CPU and JVM usage. You can read the list of changes at: https://lucene.apache.org/solr/8_7_0/changes/Changes.html.
Apache Solr 8.7.0 can be downloaded from http://www.apache.org/dyn/closer.cgi/lucene/solr.