In the lefthand Tool links on English Wikipedia there is a link to "Page Watchers" which links to a 404 page:
https://tools.wmflabs.org/mzmcbride/watcher/?db=enwiki_p&titles=User%3ACheckingfax
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(It's welcome to associate at least one project with this task, otherwise nobody can find this task when searching in the corresponding project(s). Thanks.)
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CC'ing @MZMcBride.
Either that tool needs to get fixed, or the link needs to be removed from the sidebar of en.wp, I guess?
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This points already to the internal link: https://en.wikipedia.org/wiki/MediaWiki:Histlegend Maybe https://en.wikipedia.org/w/index.php?title=English_Wikipedia&action=info#mw-pageinfo-watchers is enough?
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There are user scripts that still reference this old tool: https://en.wikipedia.org/w/index.php?search=mzmcbride+watcher+intitle%3Ajs&title=Special:Search&profile=all&fulltext=1. As Jaime notes, we have https://en.wikipedia.org/w/index.php?title=English_Wikipedia&action=info#mw-pageinfo-watchers now. My guess is that some custom user script that @Samtar loads was recently updated to remove the (broken) link.
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Quite possibly! Are there any plans to fix the tool? If not, redirecting from the tool to index.php?title=[title]&action=info#mw-pageinfo-watchers could be a good work around? (Would obviously be preferable to remove the links)