fix: don't show metadata for embedded dashboards (#30875)

superset-frontend/src/dashboard/components/Header/Header.test.tsx

@@ -373,3 +373,48 @@ test('should render an extension component if one is supplied', () => {
     screen.getByText('dashboard.nav.right extension component'),
   ).toBeInTheDocument();
 });
+
+test('should NOT render MetadataBar when in edit mode', () => {
+  const mockedProps = {
+    ...createProps(),
+    editMode: true,
+    dashboardInfo: {
+      ...createProps().dashboardInfo,
+      userId: '123',
+    },
+  };
+  setup(mockedProps);
+  expect(
+    screen.queryByText(mockedProps.dashboardInfo.changed_on_delta_humanized),
+  ).not.toBeInTheDocument();
+});
+
+test('should NOT render MetadataBar when embedded', () => {
+  const mockedProps = {
+    ...createProps(),
+    editMode: false,
+    dashboardInfo: {
+      ...createProps().dashboardInfo,
+      userId: undefined,
+    },
+  };
+  setup(mockedProps);
+  expect(
+    screen.queryByText(mockedProps.dashboardInfo.changed_on_delta_humanized),
+  ).not.toBeInTheDocument();
+});
+
+test('should render MetadataBar when not in edit mode and not embedded', () => {
+  const mockedProps = {
+    ...createProps(),
+    editMode: false,
+    dashboardInfo: {
+      ...createProps().dashboardInfo,
+      userId: '123',
+    },
+  };
+  setup(mockedProps);
+  expect(
+    screen.getByText(mockedProps.dashboardInfo.changed_on_delta_humanized),
+  ).toBeInTheDocument();
+});

superset-frontend/src/dashboard/components/Header/index.jsx

@@ -496,6 +496,7 @@ class Header extends PureComponent {
     const refreshWarning =
       dashboardInfo.common?.conf
         ?.SUPERSET_DASHBOARD_PERIODICAL_REFRESH_WARNING_MESSAGE;
+    const isEmbedded = !dashboardInfo?.userId;
 
     const handleOnPropertiesChange = updates => {
       const { dashboardInfoChanged, dashboardTitleChanged } = this.props;
@@ -553,7 +554,7 @@ class Header extends PureComponent {
                 visible={!editMode}
               />
             ),
-            !editMode && (
+            !editMode && !isEmbedded && (
               <MetadataBar
                 items={this.getMetadataItems()}
                 tooltipPlacement="bottom"