Latest Jira Server REST API documentation

What’s the latest Jira Server API documentation?

The page links to which redirects to 8.5.16

When I go one level up Index of ./software/jira/docs/api/REST then I see the last visible version there is 7.6.1 and the redirects to 7.6.1 too.

But the latest release today is 8.17.1 but it’s linked nowhere, I have guessed the URL.