release-notes/3.9.9.md
RabbitMQ 3.9.9 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 the latest Erlang 24 version, 24.1.2 at the time of release. 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.
Fixed an issue where node monitor could produce a false network partition when one of the cluster members was restarted
GitHub issue: #3631
Message store resiliency improvements
GitHub issue: #3615
Reduced log noise in certain scenarios where a new queue leader is elected
GitHub issue: #3628
Queue leader rebalancing now logs less
GitHub issue: #3643
cluster_formation.target_cluster_size_hint is a new configuration setting that can be used to specify expected initial cluster size.
This can be used by features, plugins or tools that expect a certain minimum number of clusters nodes
to join during initial cluster formation
GitHub issue: #3635
Metric rendering efficiency improvements (mostly latency)
GitHub issue: #3587
TLS-enabled Prometheus endpoint listener port was not correctly stored internally
GitHub issue: #2975
Persistent message count is now displayed correctly on individual queue pages
GitHub issue: #3598
Restore compatibility with IE 11
GitHub issue: #3689
Corrected deletion of duplicate bindings between an exchange and a queue
Contributed by @FalconerTC
GitHub issue: #3594
Ra was upgraded to 2.0.2
Osiris was upgraded to 1.2.3
To obtain source code of the entire distribution, please download the archive named rabbitmq-server-3.9.9.tar.xz
instead of the source tarball produced by GitHub.