refactor: autosummary: Deprecate _simple_info() and _simple_warn()

CHANGES

@@ -13,6 +13,8 @@ Deprecated
 * ``sphinx.ext.autodoc.AttributeDocumenter.isinstanceattribute()``
 * ``sphinx.ext.autodoc.directive.DocumenterBridge.reporter``
 * ``sphinx.ext.autodoc.importer.get_module_members()``
+* ``sphinx.ext.autosummary.generate._simple_info()``
+* ``sphinx.ext.autosummary.generate._simple_warn()``
 
 Features added
 --------------

doc/extdev/deprecated.rst

@@ -36,6 +36,16 @@ The following is a list of deprecated interfaces.
      - 5.0
      - ``sphinx.ext.autodoc.ModuleDocumenter.get_module_members()``
 
+   * - ``sphinx.ext.autosummary.generate._simple_info()``
+     - 3.5
+     - 5.0
+     - :ref:`logging-api`
+
+   * - ``sphinx.ext.autosummary.generate._simple_warn()``
+     - 3.5
+     - 5.0
+     - :ref:`logging-api`
+
    * - The ``follow_wrapped`` argument of ``sphinx.util.inspect.signature()``
      - 3.4
      - 5.0

sphinx/ext/autosummary/generate.py

@@ -101,10 +101,14 @@ def setup_documenters(app: Any) -> None:
 
 
 def _simple_info(msg: str) -> None:
+    warnings.warn('_simple_info() is deprecated.',
+                  RemovedInSphinx50Warning, stacklevel=2)
     print(msg)
 
 
 def _simple_warn(msg: str) -> None:
+    warnings.warn('_simple_warn() is deprecated.',
+                  RemovedInSphinx50Warning, stacklevel=2)
     print('WARNING: ' + msg, file=sys.stderr)