Enable RabbitMQ feature flags pre-upgrade

This task must be carried out before any RabbitMQ instances are
stopped, so must live in the playbook as opposed to the role.

This complements the post-upgrade enablement which happens within
the role itself, and covers the case where older versions of the
role have not already enabled the relevant flags.

Depends-On: https://review.opendev.org/c/openstack/openstack-ansible-rabbitmq_server/+/920999
Change-Id: Idf33b6810e1afb3a89dad5e65a48e86ac0a58a67
(cherry picked from commit 6a21e2e267)

ansible-role-requirements.yml

@@ -260,7 +260,7 @@
 - name: rabbitmq_server
   scm: git
   src: https://opendev.org/openstack/openstack-ansible-rabbitmq_server
-  version: 2e849ca843d9f23f5b7feabb73a1c4788c9140e0
+  version: a61e85039b5edd8b39f3585dfa11eabc47046812
   trackbranch: stable/2023.1
   shallow_since: '2024-05-05'
 - name: repo_server

playbooks/rabbitmq-install.yml

@@ -40,6 +40,19 @@
   tags:
     - rabbitmq
 
+# Stable feature flags must be enabled pre-upgrade
+# https://www.rabbitmq.com/docs/feature-flags#version-compatibility
+- name: Enable stable feature flags pre-upgrade
+  hosts: "{{ rabbitmq_host_group | default('rabbitmq_all') }}[0]"
+  gather_facts: false
+  user: root
+  tasks:
+    - name: Running feature flags tasks from the role
+      import_role:
+        name: rabbitmq_server
+        tasks_from: rabbitmq_feature_flags.yml
+      when: rabbitmq_upgrade | default(false) | bool
+
 # The cluster must be stopped when doing major/minor upgrades
 # http://www.rabbitmq.com/clustering.html#upgrading
 - name: Stop RabbitMQ nodes that are not the upgrader

releasenotes/notes/rabbitmq-feature-flags-d1a0f3fd4e17cbf4.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Stable RabbitMQ feature flags will be enabled automatically pre-upgrade
+    in order to prevent failures during the upgrade process.