How do we set things up in our _redirect file so has to have 410 status sent with certain former pages? Ideally in the same fashion as a 404 where the originally requested URL still shows, but displays the 404 error page.
After experimentation, I discovered that by redirecting to a 410.html file, the system does what was needed. It shows the 410.html file content, it returns a 410 status and it keeps the originally requested URL in the address bar.
/old-file-name /410.html 410
It would have been very useful if this was mentioned in the Netlify Docs about redirects, they only address 301 and 404 situations.