pjmcarthur

We now have this running in production and have been able to see it working as expected, so I'm taking the PR out of draft status. @dsmiley fyi.

Test failure is reproducible on the main branch with `gradlew :solr:core:test --tests "org.apache.solr.cloud.OverseerStatusTest.test" -Ptests.jvms=96 "-Ptests.jvmargs=-XX:TieredStopAtLevel=1 -XX:+UseParallelGC -XX:ActiveProcessorCount=1 -XX:ReservedCodeCacheSize=120m" -Ptests.seed=9491A2C35A439099 -Ptests.timeoutSuite=600000! -Ptests.file.encoding=US-ASCII`