Solr 10 blockers in JIRA: https://issues.apache.org/jira/issues/?jql=project%20%3D%20SOLR%20AND%20priority%20%3D%20Blocker%20AND%20fixVersion%20%3D%20%22main%20(10.0)%22%20AND%20resolution%20is%20EMPTY%20ORDER%20BY%20updated%20ASC
I groomed a few I've interacted with recently. Additionally some PRs of mine: SOLR-17069: update solr-jetty-context.xml -- PR #3760 SOLR-17712: Deprecating waitForFinalState parameter -- PR #3756 There's a separate PR #3684 that makes this "true" by default. It's pretty close... requires likely relaxing the LockLevel for add/delete replica property. I'll file a JIRA & PR for that specifically. And some WIP I have on lowering some INFO logs to DEBUG -- we'll see if I get to that.
