Merge requests are a place to propose changes you've made to a project and discuss those changes with others
Interested parties can even contribute by pushing commits if they want to.
GitHost.io will be shut down on June 1, 2019. At that point this instance will be unreachable and all data will be irrevocably deleted. More details at https://about.gitlab.com/gitlab-hosted/#githost-is-shutting-down-on-june-1st-2019