Fix `view_alert_integrations_list` Snowplow event

app/assets/javascripts/alerts_settings/components/alerts_integrations_list.vue

@@ -92,7 +92,17 @@ export default {
     };
   },
   mounted() {
-    this.trackPageViews();
+    const callback = entries => {
+      const isVisible = entries.some(entry => entry.isIntersecting);
+
+      if (isVisible) {
+        this.trackPageViews();
+        this.observer.disconnect();
+      }
+    };
+
+    this.observer = new IntersectionObserver(callback);
+    this.observer.observe(this.$el);
   },
   methods: {
     tbodyTrClass(item) {

changelogs/unreleased/276185_alerts_integrations_list_tracking.yml

+---
+title: Fix alerts integration list Snowplow tracking event
+merge_request: 47413
+author:
+type: fixed

spec/frontend/alerts_settings/alerts_integrations_list_spec.js

 import { GlTable, GlIcon, GlButton } from '@gitlab/ui';
 import { mount } from '@vue/test-utils';
+import { useMockIntersectionObserver } from 'helpers/mock_dom_observer';
 import Tracking from '~/tracking';
 import AlertIntegrationsList, {
   i18n,
@@ -23,6 +24,7 @@ const mockIntegrations = [
 
 describe('AlertIntegrationsList', () => {
   let wrapper;
+  const { trigger: triggerIntersection } = useMockIntersectionObserver();
 
   function mountComponent({ data = {}, props = {} } = {}) {
     wrapper = mount(AlertIntegrationsList, {
@@ -100,12 +102,23 @@ describe('AlertIntegrationsList', () => {
 
   describe('Snowplow tracking', () => {
     beforeEach(() => {
-      jest.spyOn(Tracking, 'event');
       mountComponent();
+      jest.spyOn(Tracking, 'event');
+    });
+
+    it('should NOT track alert list page views when list is collapsed', () => {
+      triggerIntersection(wrapper.vm.$el, { entry: { isIntersecting: false } });
+
+      expect(Tracking.event).not.toHaveBeenCalled();
     });
 
-    it('should track alert list page views', () => {
+    it('should track alert list page views only once when list is expanded', () => {
+      triggerIntersection(wrapper.vm.$el, { entry: { isIntersecting: true } });
+      triggerIntersection(wrapper.vm.$el, { entry: { isIntersecting: true } });
+      triggerIntersection(wrapper.vm.$el, { entry: { isIntersecting: true } });
+
       const { category, action } = trackAlertIntegrationsViewsOptions;
+      expect(Tracking.event).toHaveBeenCalledTimes(1);
       expect(Tracking.event).toHaveBeenCalledWith(category, action);
     });
   });

spec/frontend/alerts_settings/alerts_settings_wrapper_spec.js

@@ -3,6 +3,7 @@ import { mount, createLocalVue } from '@vue/test-utils';
 import createMockApollo from 'jest/helpers/mock_apollo_helper';
 import waitForPromises from 'helpers/wait_for_promises';
 import { GlLoadingIcon, GlAlert } from '@gitlab/ui';
+import { useMockIntersectionObserver } from 'helpers/mock_dom_observer';
 import AlertsSettingsWrapper from '~/alerts_settings/components/alerts_settings_wrapper.vue';
 import AlertsSettingsFormOld from '~/alerts_settings/components/alerts_settings_form_old.vue';
 import AlertsSettingsFormNew from '~/alerts_settings/components/alerts_settings_form_new.vue';
@@ -47,6 +48,7 @@ describe('AlertsSettingsWrapper', () => {
   let wrapper;
   let fakeApollo;
   let destroyIntegrationHandler;
+  useMockIntersectionObserver();
 
   const findLoader = () => wrapper.find(IntegrationsList).find(GlLoadingIcon);
   const findIntegrations = () => wrapper.find(IntegrationsList).findAll('table tbody tr');