GitLab (and GitHub) use issue and milestone features to log and work through change requests. We can apply tags to these issues and group issues by milestone.
When approving changes, we can reference these issues and change requests in our merge requests that will ultimately update documentation. This allows us to carry through any change requests directly with the content changes - making analyzing content updates easier.
Document lifecycle tools also give us options to integrate service desks and external issue trackers e.g., https://gitlab.com/help/user/project/service_desk.
We should generally add information on how to log issues on a document in a document’s CONTRIBUTING.md file. This will tell collaborators how they can log an issue or how they can update any issue themselves.