Automatic Observer Promotion for Safe, Multi-Datacenter Failover in Confluent 6.1

What this post added

Introduces Automatic Observer Promotion for Kafka observers, allowing them to be automatically promoted to the ISR list when min.insync.replicas is not met. Details the behavior, configuration options (observerPromotionPolicy: under-min-isr, under-replicated, leader-is-observer), and the technical benefits of zero RPO and low RTO compared to manual unclean leader election. Activates this feature by changing the replica placement policy version to two.