def check_compatibility(self):
        """Process config and warn on each obsolete or deprecated entry."""
        self._compat(cherrypy.config)
        for sn, app in cherrypy.tree.apps.items():
            if not isinstance(app, cherrypy.Application):
                continue
            self._compat(app.config)
Process config and warn on each obsolete or deprecated entry.
cherrypy/_cpchecker.py