[MD] Validate length of title to be less or equal than 32 characters

Signed-off-by: Zhongnan Su <szhongna@amazon.com>

CHANGELOG.md

@@ -119,6 +119,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - [BUG][Multiple Datasource] Refactor read-only component to cover more edge cases ([#6416](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/6416))
 - [BUG] Fix for checkForFunctionProperty so that order does not matter ([#6248](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/6248))
 - [BUG][Multiple Datasource] Validation succeed as long as status code in response is 200 ([#6399](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/6399))
+- [BUG][Multiple Datasource] Add validation for title length to be no longer than 32 characters [#6452](https://github.com/opensearch-project/OpenSearch-Dashboards/pull/6452))
 
 ### 🚞 Infrastructure
 

src/plugins/data_source_management/public/components/validation/datasource_form_validation.test.ts

@@ -40,6 +40,11 @@ describe('DataSourceManagement: Form Validation', () => {
       );
       expect(result).toBe(false);
     });
+    test('should fail validation when title is longer than 32 characters', () => {
+      form.title = 'test'.repeat(10);
+      const result = performDataSourceFormValidation(form, [], '', authenticationMethodRegistry);
+      expect(result).toBe(false);
+    });
     test('should fail validation when endpoint is not valid', () => {
       form.endpoint = mockDataSourceAttributesWithAuth.endpoint;
       const result = performDataSourceFormValidation(form, [], '', authenticationMethodRegistry);

src/plugins/data_source_management/public/components/validation/datasource_form_validation.ts

@@ -50,8 +50,14 @@ export const isTitleValid = (
     error: '',
   };
   /* Title validation */
-  if (!title?.trim?.().length) {
+  if (!title.trim().length) {
     isValid.valid = false;
+  } else if (title.length > 32) {
+    /* title length validation */
+    isValid.valid = false;
+    isValid.error = i18n.translate('dataSourcesManagement.validation.titleLength', {
+      defaultMessage: 'Title must be no longer than 32 characters',
+    });
   } else if (
     title.toLowerCase() !== existingTitle.toLowerCase() &&
     Array.isArray(existingDatasourceNamesList) &&