Fixed #35591 -- Added unsuitable for production console warning to runserver.

docs/intro/tutorial01.txt

@@ -134,6 +134,9 @@ You'll see the following output on the command line:
     Starting development server at http://127.0.0.1:8000/
     Quit the server with CONTROL-C.
 
+    WARNING: This is a development server. Do not use it in a production setting. Use a production WSGI or ASGI server instead.
+    For more information on production servers see: https://docs.djangoproject.com/en/stable/howto/deployment/
+
 .. note::
     Ignore the warning about unapplied database migrations for now; we'll deal
     with the database shortly.

docs/ref/django-admin.txt

@@ -947,6 +947,20 @@ multithreaded by default.
 Uses IPv6 for the development server. This changes the default IP address from
 ``127.0.0.1`` to ``::1``.
 
+.. envvar:: HIDE_PRODUCTION_WARNING
+
+.. versionadded:: 5.2
+
+By default, a warning is printed to the console that ``runserver`` is not
+suitable for production:
+
+.. code-block:: text
+
+    WARNING: This is a development server. Do not use it in a production setting. Use a production WSGI or ASGI server instead.
+    For more information on production servers see: https://docs.djangoproject.com/en/stable/howto/deployment/
+
+Set this environment variable to ``"true"`` to hide this warning.
+
 Examples of using different ports and addresses
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

docs/releases/5.2.txt

@@ -194,7 +194,10 @@ Logging
 Management Commands
 ~~~~~~~~~~~~~~~~~~~
 
-* ...
+* A new warning is printed to the console when running :djadmin:`runserver` that
+  ``runserver`` is unsuitable for production. This warning can be hidden by
+  setting the :envvar:`HIDE_PRODUCTION_WARNING` environment variable to
+  ``"true"``.
 
 Migrations
 ~~~~~~~~~~