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Update 4.1.0 release notes

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David Ansari 2024-10-07 17:55:58 +02:00
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## RabbitMQ 4.1.0
## Highlights
### AMQP 1.0 Filter Expressions
[PR #12415](https://github.com/rabbitmq/rabbitmq-server/pull/12415) implements `properties` and `appliation-properties` filters of [AMQP Filter Expressions Version 1.0 Working Draft 09](https://groups.oasis-open.org/higherlogic/ws/public/document?document_id=66227) when consuming from a stream via AMQP 1.0.
String prefix and suffix matching is also supported.
This feature:
* adds the ability to RabbitMQ to have multiple concurrent clients each consuming only a subset of messages while maintaining message order, and
* reduces network traffic between RabbitMQ and clients by only dispatching those messages that the clients are actually interested in.
### Prometheus histogram for message sizes
[PR #12342](https://github.com/rabbitmq/rabbitmq-server/pull/12342) exposes a Prometheus histogram for message sizes received by RabbitMQ.
This feature allows operators to gain insights into the message sizes being published to RabbitMQ, such as average message size, number of messages per pre-defined bucket (which can both be computed accurately), and percentiles (which will be approximated).
Each metric is labelled by protocol (AMQP 1.0, AMQP 0.9.1, MQTT 5.0, MQTT 3.1.1, and MQTT 3.1).
## Potential incompatibilities
* The default MQTT [Maximum Packet Size](https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901086) changed from 256 MiB to 16 MiB. This default can be overriden by [configuring](https://www.rabbitmq.com/docs/configure#config-file) `mqtt.max_packet_size_authenticated`. Note that this value must not be greater than `max_message_size` (which also defaults to 16 MiB).
* The default MQTT [Maximum Packet Size](https://docs.oasis-open.org/mqtt/mqtt/v5.0/os/mqtt-v5.0-os.html#_Toc3901086) changed from 256 MiB to 16 MiB. This default can be overridden by [configuring](https://www.rabbitmq.com/docs/configure#config-file) `mqtt.max_packet_size_authenticated`. Note that this value must not be greater than `max_message_size` (which also defaults to 16 MiB).