A Flarum extension. Warn before necrobumping old discussions.
Necrobump (verb):
To revive a long dormant forum thread by adding a new post, thus bringing it to the top of the forum list. Often a tactic of trolls attempting to control a forum.
Use Bazaar or install manually with composer:
composer require fof/prevent-necrobumpingcomposer update fof/prevent-necrobumping
An extension by FriendsOfFlarum, commissioned by webdeveloper.com.