Configuring Apache Kafka Consumer Group IDs

What this post added

This post elaborates on the fundamental concept of Kafka consumer group IDs, detailing their role in detecting new data via offsets, enabling work sharing among consumers for parallel processing, and ensuring fault tolerance through rebalancing mechanisms. It introduces the concept of static membership (using `group.instance.id`) as an optimization for applications with large local state to reduce rebalance-related data transfer and improve rolling upgrades.