I was expecting a "set your custom subdomain then create a CNAME pointing to " or something. It seems maybe like the current UI is leaning that direction, but the docs maybe predate (and reflect an older workaround to do a custom subdomain via proxying)?

Fwiw, we certain _can_ proxy, but I'd definitely assume a more "normal" approach of simply pointing a CNAME to Integry and it working automatically (with SSL). (We do that with probably a dozen other SaaS's at our own subdomains, fwiw.)