Is there a plugin to limit the number of mobs that occupy a chunk in minecraft?
I'm concerned about players breeding or afking a mob spawner and bringing the server down by over concentrating mobs.
There is also EntitySuppressor, but I don't know if it supports per-chunk settings.
The plugin NoSpawn has got some kind of limit, but I think it's server-wide, not per chunk. It might be able to help with your problem though.