Dynamic Kafka controller quorum

The blog post discusses the introduction of dynamic quorum configuration in Apache Kafka v3.9.0, allowing for dynamic scaling of controller nodes in KRaft clusters without requiring downtime. It explains the concept of scalability, the limitations of static quorum configurations, and details on how to manage controller nodes through new remote procedure calls (RPCs) while ensuring safety and availability during changes. The article includes practical examples and highlights future improvements needed for this feature.