This is a maintenance release with improvements for high-performance sites (and a wild bug fix appeared).
- #7634: Use a bounded load-balancing algo to distribute queries.
- #7651: Implement a configurable ECS cache limit so responses with an ECS scope more specific than a certain threshold and a TTL smaller than a specific threshold are not inserted into the records cache at all.
- #7647: Provide CPU usage statistics per thread (worker & distributor).
- #7495: Correctly interpret an empty AXFR response to an IXFR query.