release-notes/3.9.16.md
RabbitMQ 3.9.16 is a maintenance release in the 3.9.x release series.
Please refer to the Upgrading to 3.9 section from v3.9.0 release notes if upgrading from a version prior to 3.9.0.
This release requires at least Erlang 23.2, and supports Erlang 24. RabbitMQ and Erlang/OTP Compatibility Matrix has more details on Erlang version requirements for RabbitMQ.
Release notes are kept under rabbitmq-server/release-notes. Contributors are encouraged to update them together with their changes. This helps with release automation and a more consistent release schedule.
Quorum queues: better forward compatibility with (currently in preview) RabbitMQ 3.10.
GitHub issue: #4560
Significantly faster queue re-import from definitions on subsequent node restarts. Initial definition import still takes the same amount of time as before.
GitHub issue: #4538
Significantly faster exchange re-import from definitions on subsequent node restarts. Initial definition import still takes the same amount of time as before.
GitHub issue: #4585
RabbitMQ nodes will now filter out certain log messages related to connections, channels, and queue leader replicas receiving internal protocol messages sent to this node before a restart. These messages usually raise more questions and cause confusion than help.
It is still possible to detect relevant underlying events (node or connection failures) from other log messages.
GitHub issue: #4557
rabbitmq-upgrade await_online_synchronized_mirror is now a no-op in single node
clusters
GitHub issue: #4570
One metric that was exposed via CLI tools and management plugin's HTTP API was not exposed via Prometheus scraping API.
Contributed by @gomoripeti.
GitHub issue: #4645
osiris upgraded from 1.2.4 to 1.2.6observer-cli was upgraded from v1.7.2 to v1.7.3To obtain source code of the entire distribution, please download the archive named rabbitmq-server-3.9.16.tar.xz
instead of the source tarball produced by GitHub.