diff --git a/tests/monit/test_monit_status.py b/tests/monit/test_monit_status.py
index 5e32cef121..1d9b97334f 100644
--- a/tests/monit/test_monit_status.py
+++ b/tests/monit/test_monit_status.py
@@ -1,12 +1,14 @@
 """
-Test the running status of Monit service
+Test the running status and format of alerting message of Monit service.
 """
 import logging
 
 import pytest
 
+from pkg_resources import parse_version
 from tests.common.utilities import wait_until
 from tests.common.helpers.assertions import pytest_assert
+from tests.common.helpers.assertions import pytest_require
 
 logger = logging.getLogger(__name__)
 
@@ -15,8 +17,19 @@
     pytest.mark.disable_loganalyzer
 ]
 
+
 @pytest.fixture
 def disable_lldp(duthosts, enum_rand_one_per_hwsku_frontend_hostname):
+    """Stops `lldpmgrd` process at setup stage and restarts it at teardwon.
+
+    Args:
+        duthosts: The fixture returns list of DuTs.
+        enum_rand_one_per_hwsku_frontend_hostname: The fixture randomly pick up
+        a frontend DuT from testbed.
+
+    Returns:
+        None.
+    """
     duthost = duthosts[enum_rand_one_per_hwsku_frontend_hostname]
     duthost.command("docker exec lldp supervisorctl stop lldpmgrd")
     if duthost.is_multi_asic:
@@ -26,23 +39,69 @@ def disable_lldp(duthosts, enum_rand_one_per_hwsku_frontend_hostname):
     if duthost.is_multi_asic:
         duthost.command("docker exec lldp0 supervisorctl start lldpmgrd")
 
+
 def check_monit_last_output(duthost):
-    monit_status_result = duthost.shell("sudo monit status \'lldp|lldpmgrd\'", module_ignore_errors=True)['stdout_lines']
-    indices = [i for i, s in enumerate(monit_status_result) if 'last output' in s]
-    monit_last_output = monit_status_result[indices[0]]
-    if duthost.is_multi_asic:
-        return "/usr/bin/lldpmgrd' is not running in host and in namespace asic0" in monit_last_output
+    """Checks whether alerting message appears as output of command 'monit status' if
+    process `lldpmgrd` was stopped.
+
+    Args:
+        duthost: An AnsibleHost object of DuT.
+
+    Returns:
+        None.
+    """
+    monit_status_result = duthost.shell("sudo monit status 'lldp|lldpmgrd'", module_ignore_errors=True)
+    exit_code = monit_status_result["rc"]
+    pytest_assert(exit_code == 0, "Failed to get Monit status of process 'lldpmgrd'!")
+
+    indices = [i for i, s in enumerate(monit_status_result["stdout_lines"]) if 'last output' in s]
+    if len(indices) > 0:
+        monit_last_output = monit_status_result["stdout_lines"][indices[0]]
+        if duthost.is_multi_asic:
+            return "/usr/bin/lldpmgrd' is not running in host and in namespace asic0" in monit_last_output
+        else:
+            return "/usr/bin/lldpmgrd' is not running in host" in monit_last_output
     else:
-        return "/usr/bin/lldpmgrd' is not running in host" in monit_last_output
+        pytes.fail("Failed to get Monit last output of process 'lldpmgrd'!")
+
 
 def test_monit_status(duthosts, enum_rand_one_per_hwsku_frontend_hostname):
+    """Checks whether the Monit service was running or not.
+
+    Args:
+        duthosts: The fixture returns list of DuTs.
+        enum_rand_one_per_hwsku_frontend_hostname: The fixture randomly picks up
+        a frontend DuT from testbed.
+
+    Returns:
+        None.
+    """
     duthost = duthosts[enum_rand_one_per_hwsku_frontend_hostname]
     monit_status_result = duthost.shell("sudo monit status", module_ignore_errors=True)
 
     exit_code = monit_status_result["rc"]
     pytest_assert(exit_code == 0, "Monit is either not running or not configured correctly")
 
+
 def test_monit_reporting_message(duthosts, enum_rand_one_per_hwsku_frontend_hostname, disable_lldp):
+    """Checks whether the format of alerting message from Monit is correct or not.
+       202012 and newer image version will be skipped for testing since Supervisord
+       replaced Monit to do the monitoring critical processes.
+
+    Args:
+        duthosts: The fixture returns list of DuTs.
+        enum_rand_one_per_hwsku_frontend_hostname: The fixture randomly pick up
+        a frontend DuT from testbed.
+        disable_lldp: The fixture function stops `lldpmgrd` process before testing
+        and restarts `lldpmgrd` process at teardown.
+
+    Returns:
+        None.
+    """
     duthost = duthosts[enum_rand_one_per_hwsku_frontend_hostname]
+
+    pytest_require("201811" in duthost.os_version or "201911" in duthost.os_version,
+                   "Test is not supported for 202012 and newer image versions!")
+
     if not wait_until(180, 60, check_monit_last_output, duthost):
         pytest.fail("Expected Monit reporting message not found")