spring-kafka-event-integration

Use when adding, reviewing, or hardening Kafka producers, consumers, or event-driven flows in a Spring Boot service after backend architecture has defined the event contracts. Produces Spring Kafka producer and consumer configuration, serialization and schema-registry posture, idempotency and exactly-once delivery decisions, retry and dead-letter topology, transactional outbox wiring, consumer group and rebalance behavior, error and poison-pill handling, observability for event flows, and integration test scaffolding with embedded or Testcontainers Kafka. Do not use for event contract design, broker provisioning, non-Kafka brokers (RabbitMQ, Pulsar, SQS), or general async/scheduled work; use backend-architecture, infrastructure-platform, or spring-boot-service-scaffold instead.