This version of GitHub Enterprise will be discontinued on 2022-02-16. No patch releases will be made, even for critical security issues. For better performance, improved security, and new features, upgrade to the latest version of GitHub Enterprise. For help with the upgrade, contact GitHub Enterprise support.
About pull requests
Pull requests let you tell others about changes you've pushed to a branch in a repository on GitHub Enterprise Server. Once a pull request is opened, you can discuss and review the potential changes with collaborators and add follow-up commits before your changes are merged into the base branch.