Deprecated the kernel.name parameter

Author: javiereguiluz

reference/configuration/kernel.rst

@@ -44,6 +44,11 @@ Kernel Name
 **type**: ``string`` **default**: ``src`` (i.e. the directory name holding
 the kernel class)
 
+.. versionadded:: 4.2
+    The ``kernel.name`` parameter and the ``Kernel::getName()`` method were
+    deprecated in Symfony 4.2. If you need a unique ID for your kernels use the
+    ``kernel.container_class`` parameter or the ``Kernel::getContainerClass()`` method.
+
 To change this setting, override the :method:`Symfony\\Component\\HttpKernel\\Kernel::getName`
 method. Alternatively, move your kernel into a different directory. For
 example, if you moved the kernel into a ``foo/`` directory (instead of ``src/``),