add suffix limit to avoid possible start problems (#7641)

CHANGES.md

@@ -52,6 +52,7 @@ Release Notes.
 * Support nacos grouped dynamic configurations.
 * Support for filter function filtering of int type values.
 * Support mTLS for gRPC channel.
+* Add yaml file suffix limit when reading ui templates.
 
 #### UI
 

docs/en/ui/README.md

@@ -37,7 +37,7 @@ User could click the `lock` button left aside the `Service/Instance/Endpoint Rel
 Users could customize the dashboard. The default dashboards are provided through the default templates located in 
 `/ui-initialized-templates` folders.
 
-The template file follows this format.
+The template file must end with `.yml` or `.yaml` and follows this format.
 ```yaml
 templates:
   - name: template name # The unique name

oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/CoreModuleProvider.java

@@ -376,6 +376,9 @@ public class CoreModuleProvider extends ModuleProvider {
         try {
             final File[] templateFiles = ResourceUtils.getPathFiles("ui-initialized-templates");
             for (final File templateFile : templateFiles) {
+                if (!templateFile.getName().endsWith(".yml") && !templateFile.getName().endsWith(".yaml")) {
+                    continue;
+                }
                 new UITemplateInitializer(new FileInputStream(templateFile))
                     .read()
                     .forEach(uiTemplate -> {