It seems a bit unusual that there is an event for when someone creates or updates a wiki page, but no event for when someone deletes a wiki page. So if you want some automation that notifies you about page deletions, it can't be done via the GitHub API.
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[ 0.23 ms ] story [ 23.2 ms ] threadOn some things editing a submission will let you add it back. Not sure about #id
Seems there is still some historical artifacts from it left.