Merge "Deprecate support of MemcachedCache backend"

manifests/init.pp

@@ -672,6 +672,8 @@ class horizon(
 
   if $manage_memcache_package {
     if $cache_backend =~ /\.MemcachedCache$/ {
+      warning("Support for MemcachedCache backend has been deprecated. \
+Use PyMemcacheCache backend instead")
       ensure_packages('python-memcache', {
         name => $::horizon::params::memcache_package,
         tag  => ['openstack'],

releasenotes/notes/deprecate-memcache-backend-ce0b3304e4842cae.yaml

@@ -0,0 +1,5 @@
+---
+deprecations:
+  - |
+    Support for the MemcachedCache backend has been deprecated. This backend
+    was deprecated in django 3.2 .