Easy install, but needs an update to display the data in CheckMK 2.x. (The data is still send from the plugins, but is not recognized on the server/appliance.)
If you are still on 1.6 or below, just use it if you have clusters.

Great plugin but not working with 2.1.
I'm not a developer but I make it working with 2.1p6. Use this fork at your own risk.
Install the 1.1 package.
Then write the files below to the proper place and after that on the console with SITE user:
cmk -U
omd restart cmc

/omd/sites/SITE/local/lib/python3/cmk/base/plugins/agent_based/mscs_resources.py

#!/usr/bin/env python3
# -*- encoding: utf-8; py-indent-offset: 4 -*-
from .agent_based_api.v1 import *
import pprint
def inventory_mscs_resources(section):
for sector, used, slots in section:
yield Service(item=sector)

def check_mscs_resources(item, section):
for name, state, node in section:
if name == item:
if state == "Online":
yield Result(state=State.OK, summary = f"State: {state}, Owner: {node}")
else:
yield Result(state=State.CRIT, summary = f"State: {state}, Owner: {node}")
register.check_plugin(
name = "mscs_resources",
service_name = "MSCS Resources - %s",
discovery_function = inventory_mscs_resources,
check_function = check_mscs_resources,
)

/omd/sites/SITE/local/lib/python3/cmk/base/plugins/agent_based/mscs_nodes.py

#!/usr/bin/env python3
# -*- encoding: utf-8; py-indent-offset: 4 -*-
from .agent_based_api.v1 import *
import pprint

def inventory_mscs_nodes(section):
for name, state in section:
yield Service(item=name)

def check_mscs_nodes(item, section):
for name, state in section:
if name == item:
if state == "Down":
yield Result(state=State.CRIT, summary = "Node is Down")
elif state == "Paused":
yield Result(state=State.WARN, summary = "Node is Paused")
else:
yield Result(state=State.OK, summary = "Node is Up and running")

register.check_plugin(
name = "mscs_nodes",
service_name = "MSCS Nodes - %s",
discovery_function = inventory_mscs_nodes,
check_function = check_mscs_nodes,
)