Fix Metric tab not showing up on operations page

- fix broken test
- add additional test

app/assets/javascripts/vue_shared/alert_details/components/alert_details.vue

@@ -368,7 +368,7 @@ export default {
           <alert-details-table :alert="alert" :loading="loading" />
         </gl-tab>
         <gl-tab
-          v-if="isThreatMonitoringPage"
+          v-if="!isThreatMonitoringPage"
           :data-testid="$options.tabsConfig[1].id"
           :title="$options.tabsConfig[1].title"
         >

changelogs/unreleased/322198-fix-metrics-tab.yml

+---
+title: Fix Metric tab not showing up on operations page
+merge_request: 54736
+author:
+type: fixed

spec/frontend/vue_shared/alert_details/alert_details_spec.js

@@ -128,6 +128,10 @@ describe('AlertDetails', () => {
         expect(wrapper.findByTestId('startTimeItem').exists()).toBe(true);
         expect(wrapper.findByTestId('startTimeItem').props('time')).toBe(mockAlert.startedAt);
       });
+
+      it('renders the metrics tab', () => {
+        expect(findMetricsTab().exists()).toBe(true);
+      });
     });
 
     describe('individual alert fields', () => {
@@ -179,7 +183,8 @@ describe('AlertDetails', () => {
     describe('Threat Monitoring details', () => {
       it('should not render the metrics tab', () => {
         mountComponent({
-          data: { alert: mockAlert, provide: { isThreatMonitoringPage: true } },
+          data: { alert: mockAlert },
+          provide: { isThreatMonitoringPage: true },
         });
         expect(findMetricsTab().exists()).toBe(false);
       });