Despawning Spawners allows you to automatically destroy spawners when it reaches X amount of spawns. (50 by default). The only config available is the amount of spawns a spawner can do.
general {
# Amount of spawns can a spawner do. It won't stop the remaining spawns of a spawner 'work'. [range: 0 ~ 2147483647, default: 50]
I:maxSpawnerSpawns=50
}