Update the description message of PSU power threshold checking in sys…

…tem health (sonic-net#15289)

- Why I did it
Adjust PSU power threshold logic in system health.

- How I did it
Update the description message in PSU power threshold checking
power of PSU x (xx w) exceeds threshold (xx w) => System power exceeds xx threshold (xx w)

- How to verify it
Manual test and unit test

src/system-health/health_checker/hardware_checker.py

@@ -257,12 +257,13 @@ def _check_psu_status(self, config):
             if not self._ignore_check(config.ignore_devices, 'psu', name, 'power_threshold'):
                 power_overload = data_dict.get('power_overload', None)
                 if power_overload == 'True':
+
                     try:
                         power = data_dict['power']
                         power_critical_threshold = data_dict['power_critical_threshold']
-                        self.set_object_not_ok('PSU', name, 'power of {} ({}w) exceeds threshold ({}w)'.format(name, power, power_critical_threshold))
+                        self.set_object_not_ok('PSU', name, 'System power exceeds threshold ({}w)'.format(power_critical_threshold))
                     except KeyError:
-                        self.set_object_not_ok('PSU', name, 'power of {} exceeds threshold but power or power_critical_threshold is invalid'.format(name))
+                        self.set_object_not_ok('PSU', name, 'System power exceeds threshold but power_critical_threshold is invalid')
                     continue
 
             self.set_object_ok('PSU', name)

src/system-health/tests/test_system_health.py

@@ -444,12 +444,12 @@ def test_hardware_checker():
     assert checker._info['PSU 5'][HealthChecker.INFO_FIELD_OBJECT_STATUS] == HealthChecker.STATUS_NOT_OK
 
     assert 'PSU 6' in checker._info
-    assert checker._info['PSU 6'][HealthChecker.INFO_FIELD_OBJECT_MSG] == 'power of PSU 6 (101.0w) exceeds threshold (100.0w)'
+    assert checker._info['PSU 6'][HealthChecker.INFO_FIELD_OBJECT_MSG] == 'System power exceeds threshold (100.0w)'
     assert checker._info['PSU 6'][HealthChecker.INFO_FIELD_OBJECT_STATUS] == HealthChecker.STATUS_NOT_OK
 
     assert 'PSU 7' in checker._info
     assert checker._info['PSU 7'][HealthChecker.INFO_FIELD_OBJECT_STATUS] == HealthChecker.STATUS_NOT_OK
-    assert checker._info['PSU 7'][HealthChecker.INFO_FIELD_OBJECT_MSG] == 'power of PSU 7 exceeds threshold but power or power_critical_threshold is invalid'
+    assert checker._info['PSU 7'][HealthChecker.INFO_FIELD_OBJECT_MSG] == 'System power exceeds threshold but power_critical_threshold is invalid'
 
 
 def test_config():