Index: trunk/data/validator/deprecated.mapcss
===================================================================
--- trunk/data/validator/deprecated.mapcss	(revision 15004)
+++ trunk/data/validator/deprecated.mapcss	(revision 15086)
@@ -1434,2 +1434,11 @@
   group: tr("deprecated tagging");
 }
+
+/* #17556 */
+*[leisure=common] {
+  throwWarning: tr("{0} is deprecated", "{0.tag}");
+  suggestAlternative: "landuse=*";
+  suggestAlternative: "leisure=*";
+  suggestAlternative: "designation=common";
+  group: tr("deprecated tagging");
+}