deprecate MultiCommand

CHANGES.rst

@@ -11,6 +11,8 @@ Unreleased
 -   Use ``flit_core`` instead of ``setuptools`` as build backend.
 -   ``BaseCommand`` is deprecated. ``Command`` is the base class for all
     commands. :issue:`2589`
+-   ``MultiCommand`` is deprecated. ``Group`` is the base class for all group
+    commands. :issue:`2590`
 
 
 Version 8.1.7

src/click/__init__.py

@@ -9,7 +9,6 @@
 from .core import CommandCollection as CommandCollection
 from .core import Context as Context
 from .core import Group as Group
-from .core import MultiCommand as MultiCommand
 from .core import Option as Option
 from .core import Parameter as Parameter
 from .decorators import argument as argument
@@ -86,4 +85,15 @@ def __getattr__(name: str) -> object:
         )
         return _BaseCommand
 
+    if name == "MultiCommand":
+        from .core import _MultiCommand
+
+        warnings.warn(
+            "'MultiCommand' is deprecated and will be removed in Click 9.0. Use"
+            " 'Group' instead.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        return _MultiCommand
+
     raise AttributeError(name)