Add Gitlab set up instructions for Code Coverage product (#31260)

* Add Gitlab set up instructions for Code Coverage product

* Apply suggestions from code review

Co-authored-by: May Lee <[email protected]>

---------

Co-authored-by: May Lee <[email protected]>

Author: 2 people

content/en/code_coverage/data_collected.md

@@ -32,6 +32,15 @@ See GitHub's [webhook events and payloads documentation][1] for a detailed descr
 
 [1]: https://docs.github.com/en/webhooks/webhook-events-and-payloads
 
+{{% /tab %}}
+{{% tab "Gitlab" %}}
+
+Code Coverage relies on Gitlab webhooks. The webhooks do not include your source code content. They only include metadata about the merge request, such as the title, description, author, labels, and commit SHAs.
+
+See Gitlab's [webhook events and payloads documentation][1] for a detailed description of the data sent by webhooks.
+
+[1]: https://docs.gitlab.com/user/project/integrations/webhook_events/
+
 {{% /tab %}}
 {{< /tabs >}}
 

content/en/code_coverage/setup.md

@@ -51,6 +51,13 @@ If everything is configured correctly, a green check mark is displayed in Datado
 
 [1]: /integrations/github/#github-apps-1
 [2]: https://app.datadoghq.com/integrations/github/configuration
+{{% /tab %}}
+{{% tab "Gitlab" %}}
+
+Follow instructions in the [Datadog Source Code Integration Guide][1] on how to connect your Gitlab repositories to Datadog.
+
+[1]: /integrations/guide/source-code-integration/?tab=gitlabsaasonprem#connect-your-git-repositories-to-datadog
+
 {{% /tab %}}
 {{< /tabs >}}
 
@@ -315,6 +322,17 @@ steps:
 </code>
 </pre>
 {{% /tab %}}
+{{% tab "Gitlab" %}}
+<pre>
+<code class="language-yaml" data-lang="yaml">
+test:
+  stage: test
+  script:
+    - ... # run your tests and generate coverage reports
+    - datadog-ci coverage upload . # make sure to add the DD_API_KEY CI/CD variable
+</code>
+</pre>
+{{% /tab %}}
 {{< /tabs >}}
 
 The command recursively searches the specified directories for supported coverage report files, so specifying the current directory (`.`) is usually sufficient.