Resolves https://github.com/spring-cloud/spring-cloud-stream/issues/2985
This commit introduces new customization options for Kafka listener containers
in Spring Cloud Stream, along with comprehensive documentation:
- Add KafkaListenerContainerCustomizer interface for Kafka-specific customization
with access to extended consumer properties
- Extend ListenerContainerWithDlqAndRetryCustomizer to include access to
extended consumer properties
- Update KafkaMessageChannelBinder to support the new customizer interfaces
- Implement KafkaListenerContainerCustomizerTests for integration testing
- Add detailed AsciiDoc reference documentation explaining the purpose,
usage, and hierarchy of these customizer interfaces:
* ListenerContainerCustomizer (existing)
* KafkaListenerContainerCustomizer (new)
* ListenerContainerWithDlqAndRetryCustomizer (extended)
- Update navigation to include the new documentation
These changes enhance the flexibility and configurability of Kafka consumer
endpoints in Spring Cloud Stream applications, allowing users to fine-tune
their listener containers based on specific requirements and scenarios,
with improved access to Kafka-specific properties.
Fixes https://github.com/spring-cloud/spring-cloud-stream/issues/2650
* Enable native observability support for output binding in the reactive Kafka binder
* Adding test to verify this support with downstream consumers
* Adding ref docs
* Addressing PR review
