As I see this is just as device report limits for this sensor (exactly warning limit have index .1010.3):
CISCO-ENTITY-SENSOR-MIB::entSensorType.1010 = INTEGER: celsius(8)
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CISCO-ENTITY-SENSOR-MIB::entSensorScale.1010 = INTEGER: units(9)
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CISCO-ENTITY-SENSOR-MIB::entSensorPrecision.1010 = INTEGER: 0
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CISCO-ENTITY-SENSOR-MIB::entSensorValue.1010 = INTEGER: 29
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CISCO-ENTITY-SENSOR-MIB::entSensorStatus.1010 = INTEGER: ok(1)
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CISCO-ENTITY-SENSOR-MIB::entSensorValueTimeStamp.1010 = Timeticks: (1) 0:00:00.01
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CISCO-ENTITY-SENSOR-MIB::entSensorValueUpdateRate.1010 = INTEGER: 600 seconds
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CISCO-ENTITY-SENSOR-MIB::entSensorMeasuredEntity.1010 = INTEGER: 1000
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdSeverity.1010.1 = INTEGER: major(20)
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdSeverity.1010.2 = INTEGER: minor(10)
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdSeverity.1010.3 = INTEGER: minor(10)
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdSeverity.1010.4 = INTEGER: major(20)
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdRelation.1010.1 = INTEGER: greaterOrEqual(4)
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdRelation.1010.2 = INTEGER: greaterOrEqual(4)
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdRelation.1010.3 = INTEGER: lessOrEqual(2)
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdRelation.1010.4 = INTEGER: lessOrEqual(2)
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdValue.1010.1 = INTEGER: 56
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdValue.1010.2 = INTEGER: 46
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdValue.1010.3 = INTEGER: 31
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdValue.1010.4 = INTEGER: -10
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdEvaluation.1010.1 = INTEGER: false(2)
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdEvaluation.1010.2 = INTEGER: false(2)
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdEvaluation.1010.3 = INTEGER: false(2)
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdEvaluation.1010.4 = INTEGER: false(2)
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdNotificationEnable.1010.1 = INTEGER: true(1)
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdNotificationEnable.1010.2 = INTEGER: true(1)
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdNotificationEnable.1010.3 = INTEGER: true(1)
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CISCO-ENTITY-SENSOR-MIB::entSensorThresholdNotificationEnable.1010.4 = INTEGER: true(1)
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I not see smart way for ignore this warning limit (without breaking set all other limits by this MIB).
Actually this is Vendor firmware issue, you need write to Cisco TAC about this trouble.
Thanks, will do