Add configuration version in configs_dispatcher page (#15530)

Author: mregrock

ydb/core/cms/console/configs_dispatcher.cpp

@@ -534,6 +534,16 @@ void TConfigsDispatcher::Handle(TEvInterconnect::TEvNodesInfo::TPtr &ev)
                     }
                 }
             }
+
+            DIV_CLASS("alert alert-info") {
+                str << "<strong>Configuration version: </strong>";
+                if (Labels.contains("config_version")) {
+                    str << Labels.at("config_version");
+                } else {
+                    str << "unknown";
+                }
+            }
+
             DIV_CLASS("tab-left") {
                 COLLAPSED_REF_CONTENT("node-labels", "Node labels") {
                     PRE() {

ydb/core/config/init/init_impl.h

@@ -1402,6 +1402,7 @@ class TInitialConfiguratorImpl
         configsDispatcherInitInfo.StartupConfigYaml = appConfig.GetStartupConfigYaml();
         configsDispatcherInitInfo.ItemsServeRules = std::monostate{},
         configsDispatcherInitInfo.Labels = Labels;
+        configsDispatcherInitInfo.Labels["config_version"] = appConfig.GetConfigDirPath() ? "v2" : "v1";
         configsDispatcherInitInfo.DebugInfo = TDebugInfo {
             .InitInfo = InitDebug.ConfigTransformInfo,
         };