For the history: the WebRSS.xml page was removed in https://github.com/xwiki/xwiki-platform/commit/179884c3740d02e8df4f2fdb81e16f25daa9d08f#diff-4b4532aa8bd08b31d3ef076440bd8a208a1116cd5f6725f4939bb0679be1248aL1-L126 ie for XWIKI-17471 in XWiki 12.6
And the decision to remove it was done in https://www.mail-archive.com/devs@xwiki.org/msg36059.html
And WebRss.xml was moved as part of the activity stream module in https://github.com/xwiki/xwiki-platform/commit/41f021985352e06e1b655529c8a9d6eee66e1ec1
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