Here on Meta, there are two tags, http-404 and broken-link that both relate to the same thing: to report links that cause 404 errors on the site. However, the http-404 tag is also used to discuss the 404 page itself. What is the difference between the tags? Should we merge them, or change their purposes so that one is for reporting broken links and the other is for discussing the 404 page?
They're really not the same thing.
Personally, I've always thought the http-404 tag looked kind of tacky. Only a programmer would even know what that means, and this is supposed to be the hub for all network issues. It really doesn't make sense to me for that tag to exist. I'd rather it be something like error-page, but apparently that tag is "reserved" for the 500 Internal Server Error page. Since the 404 and 500 pages are different from one another, I'm not sure how viable merging them together would be.
That being said, it's also not the same as the broken-link tag, which is for questions about broken links within posts and comments, and not about 404 error pages on the network. I've updated the tag wiki excerpt to the following:
For discussing the effects of broken links within posts and comments across the network, what to do with them, and how we can prevent them from becoming broken.