After adding a repository, navigate to your repository's Settings -> Integrations tab to enable GitLab integration for pull request status and comments.
When Pull Request Status or Pull Request Comment is enabled, Codacy will automatically update pull requests on GitLab with additional information when accepting pull requests.
Pull Request Status will only be added if the user that added the integration has at least write permissions for that repository. The status shows whether your pull request and coverage are up to standards or not as per the Pull Request Quality Settings set up for your repository. To see the coverage status, please make sure the Coverage option is enabled in the Pull Request Quality settings.
Pull Request Comment makes a comment on the Pull Request line when a new issue is found and shows the pattern raising the issue. Click on the issue link to go to Codacy to see more details about the issue and how to fix it.