Kind bookmarks
I think the general rule of thumb is "try not to support anything other than the latest version in Production and the latest development version, and even then reduce the time that there are two versions as much as possible" but with things like user-managed software, or where your path to production is slower, it can be difficult to say that.
This is something I strive quite hard to ensure, using tools like html-proofer and comparing against old sitemaps when I change things considerably with my site. It's also something that is quite infuriating when following links to a site that has now rewritten their URLs, so I've learned from that too!
Thanks to Joe Nash for sharing this yesterday, I 100% agree with this - not just on the blogumentation angle, but because making these things visible is really important. And especially now, where every company is a remote company, it makes sense to start building these into your ways of working.
This is a really great interview with Anna Dodson about the great work that Tech Nottingham are doing under both Women in Tech and Tech Nottingham, and is a great read for how they're making Nottingham a much better place to be!
The first answer, [$]
resolved this for me.