Some API previews have graduated and are now an official part of the API. These preview headers are no longer required.
machine-man preview graduates
The GitHub App endpoints and endpoints that returned the
performed_via_github_app property no longer require the
For more information, see the "GitHub Apps REST API."
sailor-v preview graduates
To add and view a lock reason to an issue, you no longer need to use the
Thanks again to everyone that tried out these API features during the preview period.