This project is being spammed to everybody's talk page on en:wiki, with no indication of who is responsible for sending out the mass messages and where they gained consensus. Please show where consensus was obtained for the mass messaging.~~~~
Topic on Talk:Google Code-in/2019
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Also happening on Commons.
The message has a signature so I think there is indication? (Furthermore, I did not receive such a message on my talk page on en.wikipedia.org so it seems like it is not "everybody's talk page".) If mass messaging requires consensus then please feel free to link to that policy. Thanks a lot!
Mass messages should only be sent to groups of users who are likely to want their attention drawn to the message. I don't think "everybody who edited a documentation page on the English Wikipedia" is a group likely to want their attention drawn to the message. Do you? As an aside, what was considered a "documentation page"? I don't even think I edited one recently, unless it means "talk page".
Documentation pages were defined as a page in template namespace ending with "doc". In your case, it's . Yes, I have to admit vandalism reverts didn't come to my mind...