Merge branch '4.4' into 5.2

* 4.4:
  Add a note about `messenger:stop-workers` command

Author: javiereguiluz

messenger.rst

@@ -487,6 +487,14 @@ On production, there are a few important things to think about:
     new worker processes. The command uses the :ref:`app <cache-configuration-with-frameworkbundle>`
     cache internally - so make sure this is configured to use an adapter you like.
 
+**Use the Same Cache Between Deploys**
+    If your deploy strategy involves the creation of new target directories, you
+    should set a value for the :ref:`cache.prefix.seed <reference-cache-prefix-seed>`
+    configuration option in order to use the same cache namespace between deployments.
+    Otherwise, the ``cache.app`` pool will use the value of the ``kernel.project_dir``
+    parameter as base for the namespace, which will lead to different namespaces
+    each time a new deployment is made.
+
 Prioritized Transports
 ~~~~~~~~~~~~~~~~~~~~~~