text: from django.core.checks import register, Warning
  from django.conf import settings
  
  
  @register()
  def settings_check(app_configs, **kwargs):
  
      setting_keys = [
          'WHITELIST_TAGS',
          'WHITELIST_ATTRS',
          'WHITELIST_STYLES',
          'WHITELIST_PROTOCOLS',
          'STRIP',
          'MARKDOWN_EXTENSIONS',
          'LINKIFY_TEXT',
          'BLEACH',
      ]
  
      has_settings_old_style = False
      for key in setting_keys:
          if getattr(settings, f"MARKDOWNIFY_{key}", None):
              has_settings_old_style = True
              break
  
      if has_settings_old_style:
          return [Warning(
              msg="Old style settings are being deprecated in version 1.0",
              hint="See https://django-markdownify.readthedocs.io/en/latest/ for instructions on upgrading your settings",
              obj="Markdownify"
          )]
  
      return []
  