The changes for
KAFKA-8265 involved adding a prefix of "admin." to Connect worker configs that would be used to configure the admin client that's used for connector DLQs. However, this was never documented in the corresponding KIP and has broken backwards compatibility with prior Connect releases since workers without the necessary "admin."-prefixed properties in their configuration files will now fail in some circumstances (e.g., when interacting with a secured Kafka cluster that requires authentication from all admin clients that interact with it).