Add Google Analytics ID to gitlab_standard schema for snowplow

Changelog: other
MR: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/71242

app/assets/javascripts/tracking/constants.js

@@ -25,3 +25,5 @@ export const LOAD_ACTION_ATTR_SELECTOR = '[data-track-action="render"]';
 export const URLS_CACHE_STORAGE_KEY = 'gl-snowplow-pseudonymized-urls';
 
 export const REFERRER_TTL = 24 * 60 * 60 * 1000;
+
+export const GOOGLE_ANALYTICS_ID_COOKIE_NAME = '_ga';

app/assets/javascripts/tracking/get_standard_context.js

-import { SNOWPLOW_JS_SOURCE } from './constants';
+import { getCookie } from '~/lib/utils/common_utils';
+import { SNOWPLOW_JS_SOURCE, GOOGLE_ANALYTICS_ID_COOKIE_NAME } from './constants';
 
 export default function getStandardContext({ extra = {} } = {}) {
   const { schema, data = {} } = { ...window.gl?.snowplowStandardContext };
@@ -8,6 +9,7 @@ export default function getStandardContext({ extra = {} } = {}) {
     data: {
       ...data,
       source: SNOWPLOW_JS_SOURCE,
+      google_analytics_id: getCookie(GOOGLE_ANALYTICS_ID_COOKIE_NAME) ?? '',
       extra: extra || data.extra,
     },
   };

doc/development/snowplow/schemas.md

@@ -21,6 +21,7 @@ The [`StandardContext`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/g
 | `environment`  | **{check-circle}**  | string (max 32 chars) | Name of the source environment, such as `production` or `staging`             |
 | `source`       | **{check-circle}**  | string (max 32 chars) | Name of the source application, such as  `gitlab-rails` or `gitlab-javascript` |
 | `plan`         | **{dotted-circle}**  | string (max 32 chars) | Name of the plan for the namespace, such as `free`, `premium`, or `ultimate`. Automatically picked from the `namespace`. |
+| `google_analytics_id` | **{dotted-circle}**  | string (max 32 chars) | Google Analytics ID, present when set from our marketing sites. |
 | `extra`        | **{dotted-circle}**  | JSON                  | Any additional data associated with the event, in the form of key-value pairs |
 
 ## Default Schema

spec/frontend/tracking/get_standard_context_spec.js

-import { SNOWPLOW_JS_SOURCE } from '~/tracking/constants';
+import { SNOWPLOW_JS_SOURCE, GOOGLE_ANALYTICS_ID_COOKIE_NAME } from '~/tracking/constants';
 import getStandardContext from '~/tracking/get_standard_context';
+import { setCookie, removeCookie } from '~/lib/utils/common_utils';
+
+const TEST_GA_ID = 'GA1.2.345678901.234567891';
+const TEST_BASE_DATA = {
+  source: SNOWPLOW_JS_SOURCE,
+  google_analytics_id: '',
+  extra: {},
+};
 
 describe('~/tracking/get_standard_context', () => {
   beforeEach(() => {
@@ -10,10 +18,7 @@ describe('~/tracking/get_standard_context', () => {
   it('returns default object if called without server context', () => {
     expect(getStandardContext()).toStrictEqual({
       schema: undefined,
-      data: {
-        source: SNOWPLOW_JS_SOURCE,
-        extra: {},
-      },
+      data: TEST_BASE_DATA,
     });
   });
 
@@ -28,9 +33,8 @@ describe('~/tracking/get_standard_context', () => {
     expect(getStandardContext()).toStrictEqual({
       schema: 'iglu:com.gitlab/gitlab_standard',
       data: {
+        ...TEST_BASE_DATA,
         environment: 'testing',
-        source: SNOWPLOW_JS_SOURCE,
-        extra: {},
       },
     });
   });
@@ -50,4 +54,15 @@ describe('~/tracking/get_standard_context', () => {
 
     expect(getStandardContext({ extra }).data.extra).toBe(extra);
   });
+
+  describe('with Google Analytics cookie present', () => {
+    afterEach(() => {
+      removeCookie(GOOGLE_ANALYTICS_ID_COOKIE_NAME);
+    });
+
+    it('appends Google Analytics ID', () => {
+      setCookie(GOOGLE_ANALYTICS_ID_COOKIE_NAME, TEST_GA_ID);
+      expect(getStandardContext().data.google_analytics_id).toBe(TEST_GA_ID);
+    });
+  });
 });