Plugins | Mob Farm Manager [supports 1.7.10 up to 1.20] Hopper support

Versions

1.7
1.8
1.9
1.10
1.11
1.12
1.13
1.14
1.15
1.16
1.17
1.18
1.19
1.20
1.20.6
1.21

As of 2.0.0.0 version you need CMILib plugin to make this plugin work properly.

Limit total amount of entities in chunks or from huge spawner farms to prevent from unnecessary server load. It can limit entity amount in each chunk by set limit. In example by default there can be only 20 pigs in one chunk and 100 animals (pigs, cows, horses, rabbits, chickens). Set your own limits and avoid lags from unnecessary mob grinders ir huge animal farms.

Minecraft 1.7.10/1.8/1.9/1.10/1.11/1.12/1.13/1.14/1.15/1.16/1.17/1.18/1.19/1.20/1.21 (recommended)
CMILib 1.0.2.0 or newer

Lightweight, works in async mode to avoid unnecessary server load
Can dynamically adjust hopper transfer rates to lower server load dramatically in case some one create huge hopper contraptions and lags out server intentionally or not.

Spoiler: Examples

Supports all entities
Can limit how many wolfs follows player at once.
Print list of chunks with most entities in them for simple management
Option to limit armor stands amount in chunk (they are entity to)
Option to limit item frame amount in chunk (they are entity to)
Option to limit placed blocks like hopper, piston, sticky piston or observer in each chunk
Option to Ignore armor stands with items in them
Option to Ignore item frames with item in them
Option to Ignore tamed animals
Option to Ignore named animals
Option to Ignore baby animals
Option to Ignore Pigs with saddles
Option to ignore world
Option to auto clean world
Option to clean only on creature spawn
Option to pick spawn events to check on
Option to make entity groups
Option to manually clean chunks around all online players with output how many entities where removed around which player
Option to limit monster building (wither, snowman, irongolem) dependign on players permissions

Config file:
Spoiler: ConfiFile

/mfm clean (chunkRadius) - Cleans entities around all players
/mfm list (chunkRadius) - Prints top 20 list of chunks with most entities in them
/mfm hoppers - Prints information related to hopper control, if feature is enabled
/mfm limits - Shows general information about entities limits in your area
/mfm reload - Reloads config file

mfm.command.clean:
description: Grants access to the clean command
default: op
mfm.command.reload:
description: Grants access to the clean command
default: op
mfm.command.list:
description: Grants access to the list command
default: op
mfm.command.hoppers:
description: Grants access to the hoppers command
default: op
mfm.build.wither
description: Grants access to build wither
default: false
mfm.build.irongolem
description: Grants access to build irongolem
default: false
mfm.build.snowman
description: Grants access to build snowman
default: false
mfm.bypasslimit.armorstand
description: Grants access to bypass armor stand limits
default: false
mfm.bypasslimit.itemframe
description: Grants access to bypass item frame limits
default: false
mfm.bypasslimit.[type]
description: Grants access to bypass particular block limit. Which can be one of 4 things: hopper, piston, sticky_piston, observer
default: false
mfm.cleaninform
description: Allows to see auto cleanup feedback messages
default: false
mfm.command.limits.full
description: Allows to see more detailed output for limits command
default: false

Setup: