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## RabbitMQ 3.8.1
RabbitMQ `3.8.1` is a maintenance release that focuses on bug fixes.
### Erlang/OTP Compatibility Notes
This release [**requires Erlang/OTP 21.3**](https://www.rabbitmq.com/which-erlang.html) or later.
`22.x` series is recommended.
[Provisioning Latest Erlang Releases](https://www.rabbitmq.com/which-erlang.html#erlang-repositories) explains
what package repositories and tools can be used to provision latest patch versions of Erlang `21.3.x` and `22.x`.
### Compatibility Notes
#### Upgrading to Erlang 21.x or Later Versions
When upgrading to this release from `3.7.6` or an older version, extra care has to be taken.
Since CLI tools from RabbitMQ releases older than 3.7.7 will fail on Erlang 21 or later,
RabbitMQ **must be upgraded at the same time as Erlang**. Alternatively the node can be upgraded
to `3.7.18` first, then Erlang 21.x or 22.x, then to RabbitMQ 3.8.x.
#### Upgrade Doc Guides and Change Log
See [3.8.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.8.0) upgrade
and compatibility notes first if upgrading from an earlier release.
See the [Upgrading guide](https://www.rabbitmq.com/upgrade.html) for general documentation on upgrades
and [RabbitMQ change log](https://www.rabbitmq.com/changelog.html) for release notes of other releases.
### Getting Help
Any questions about this release, upgrades or RabbitMQ in general are welcome on the
[RabbitMQ mailing list](https://groups.google.com/forum/#!forum/rabbitmq-users).
## Changes
### Core Server
#### Bug Fixes
* Rolling cluster upgrade could fail if new versions were deployed to all cluster nodes at once instead
of a rolling upgrade-then-restart for each node individually.
GitHub issue: [rabbitmq/rabbitmq-server#2132](https://github.com/rabbitmq/rabbitmq-server/issues/2132)
* Avoid pattern expansion when logging connection closure reason.
GitHub issue: [rabbitmq/rabbitmq-server#2155](https://github.com/rabbitmq/rabbitmq-server/pull/2155)
* Improved error handling in a module that continuously registers the node with [epmd](https://www.rabbitmq.com/clustering.html) avoids
log noise.
GitHub issue: [rabbitmq/rabbitmq-server#2130](https://github.com/rabbitmq/rabbitmq-server/issues/2130)
#### Enhancements
* Peak [quorum queue](https://www.rabbitmq.com/quorum-queues.html) memory usage was reduced by up to 25% on some workloads.
GitHub issue: [rabbitmq/rabbitmq-server#2138](https://github.com/rabbitmq/rabbitmq-server/pull/2138)
### CLI Tools
#### Bug Fixes
* `rabbitmqctl await_startup` failed with an exception when effective timeout was set to `infinity`.
GitHub issue: [rabbitmq/rabbitmq-server#2144](https://github.com/rabbitmq/rabbitmq-server/pull/2144)
* `rabbitmq-diagnostics check_port_connectivity` produced a false positive in an IPv6-only environment.
Contributed by Gabriele Santomaggio.
GitHub issue: [rabbitmq/rabbitmq-cli#385](https://github.com/rabbitmq/rabbitmq-cli/pull/385)
* `rabbitmq-diagnostics list_unresponsive_queues` failed in environments that had quorum queues.
GitHub issue: [rabbitmq/rabbitmq-cli#386](https://github.com/rabbitmq/rabbitmq-cli/issues/386)
* `rabbitmq-diagnostics status`, `rabbitmq-diagnostics cluster_status`, `rabbitmq-diagnostics listeners` now support
`--formatter=erlang` (raw Erlang data structure output)
GitHub issue: [rabbitmq/rabbitmq-cli#383](https://github.com/rabbitmq/rabbitmq-cli/issues/383)
#### Enhancements
* `rabbitmq-diagnostics consume_event_stream` is a new command that makes it easier to consume a stream
of internal commands. This can be useful for troubleshooting and auditing. Previously this was only
possible via the [rabbitmq-event-exchange](https://github.com/rabbitmq/rabbitmq-event-exchange) plugin.
GitHub issue: [rabbitmq/rabbitmq-cli#299](https://github.com/rabbitmq/rabbitmq-cli/issues/299)
* `rabbitmq-diagnostics check_certificate_expiration` is a new [health check](https://www.rabbitmq.com/monitoring.html#health-checks) command
that fails when any of the certificates used by target node expire within a specified time window.
`rabbitmq-diagnostics certificates` is its diagnostics (informative) counterpart that displays all CA and leaf certificates
used by target node.
GitHub issue: [rabbitmq/rabbitmq-cli#305](https://github.com/rabbitmq/rabbitmq-cli/issues/305)
### Prometheus Plugin
#### Bug Fixes
* Prometheus scraping API endpoint was unreasonably strict about the set of content types it accepts from clients,
which caused Telegraf Prometheus input requests to fail with an`406 Not Acceptable` response.
GitHub issue: [rabbitmq/rabbitmq-prometheus#12](https://github.com/rabbitmq/rabbitmq-prometheus/issues/12)
### Management Plugin
#### Bug Fixes
* Some metrics were omitted in the UI for queues that did not have `x-queue-type` set.
GitHub issue: [rabbitmq/rabbitmq-management#741](https://github.com/rabbitmq/rabbitmq-management/issues/741)
### LDAP Plugin
#### Enhancements
* Errors were not propagated back to the client correctly in case of an LDAP server authentication failure.
GitHub issue: [rabbitmq/rabbitmq-auth-backend-ldap#116](https://github.com/rabbitmq/rabbitmq-auth-backend-ldap/issues/116)
### Kubernetes Peer Discovery Plugin
#### Bug Fixes
* Requests to Kubernetes API endpoints failed with an `nxdomain` (domain name resolution failure)
in an IPv6-only environment.
GitHub issue: [rabbitmq/rabbitmq-peer-discovery-k8s#55](https://github.com/rabbitmq/rabbitmq-peer-discovery-k8s/issues/55)
### Consul Peer Discovery Plugin
#### Enhancements
* It is now possible to specify service metadata values:
``` ini
cluster_formation.consul.svc_meta.key1 = value1
cluster_formation.consul.svc_meta.key2 = value2
```
GitHub issue: [rabbitmq/rabbitmq-peer-discovery-consul#34](https://github.com/rabbitmq/rabbitmq-peer-discovery-consul/issues/34)
### MQTT Plugin
* Client ID tracking is now more resilient to node failures and decomissioning.
GitHub issue: [rabbitmq/rabbitmq-mqtt#213](https://github.com/rabbitmq/rabbitmq-mqtt/issues/213)
### STOMP Plugin
#### Enhancements
* The [`x-queue-type` header](https://www.rabbitmq.com/quorum-queues.html) is now accepted from STOMP clients.
GitHub issue: [rabbitmq/rabbitmq-stomp#138](https://github.com/rabbitmq/rabbitmq-stomp/issues/138)
#### Bug Fixes
* `stomp.hide_server` is now available in the new style configuration format.
GitHub issue: [rabbitmq/rabbitmq-stomp#140](https://github.com/rabbitmq/rabbitmq-stomp/issues/140)
### Web STOMP Plugin
#### Bug Fixes
* The plugin emitted a warning on start.
GitHub issue: [rabbitmq/rabbitmq-web-stomp#115](https://github.com/rabbitmq/rabbitmq-web-stomp/issues/115)
### Web MQTT Plugin
#### Bug Fixes
* The plugin emitted a warning on start.
GitHub issue: [rabbitmq/rabbitmq-web-mqtt#59](https://github.com/rabbitmq/rabbitmq-web-mqtt/issues/59)
### Erlang Client
#### Bug Fixes
* Connection could not be restarted after a heartbeat timeout due to strict pattern matching.
Contributed by Giuseppe D'Anna (@larrywax).
GitHub issue: [rabbitmq/rabbitmq-erlang-client#126](https://github.com/rabbitmq/rabbitmq-erlang-client/pull/126)
### Tracing Plugin
#### Bug Fixes
* On Windows, deleting the file used by an active (running) trace resulted in an `EACCES` exception.
GitHub issue: [rabbitmq/rabbitmq-tracing#31](https://github.com/rabbitmq/rabbitmq-tracing/issues/31)
## Source code archives
**Warning**: The source code archive provided by GitHub only contains the source of the broker,
not the plugins or the client libraries. Please download the archive named `rabbitmq-server-3.8.1.tar.xz`.
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