Which tool in GitLab is useful for code review aside from the merge request?

The Wiki in GitLab is a valuable tool for code review as it provides a platform for collaboration and knowledge sharing among team members. It allows project participants to document and discuss coding practices, project guidelines, and even specific code-related content in a structured way. While the merge request is the primary mechanism for code review, the Wiki can supplement this by offering context, explanations, or detailed information related to the code being reviewed, thus enhancing the code review process.

In contrast to the Wiki, other tools listed may assist in the broader development cycle but do not specifically cater to code review in the same way. For instance, the commit history provides a record of changes and can be useful for tracking what has been altered over time, but it lacks the interactive and collaborative features that the Wiki offers. The branch manager helps manage various branches in a project but does not facilitate review and discussion. The project board serves as a visual management tool for tasks and issues, which while helpful, does not directly relate to the assessment or discussion of code quality.