The following are Hardware Health (Node) variables which can be used with alerts.
Overall Hardware Status (Node):
${N=SwisEntity;M=HardwareInfo.CategoriesWithProblems}
${N=SwisEntity;M=HardwareInfo.CategoriesWithStatus}
${N=SwisEntity;M=HardwareInfo.DetailsUrl}
${N=SwisEntity;M=HardwareInfo.FullyQualifiedName}
${N=SwisEntity;M=HardwareInfo.LastPollStatusName}
${N=SwisEntity;M=HardwareInfo.ID}
${N=SwisEntity;M=HardwareInfo.IsDisabled;F=TrueFalse}
${N=SwisEntity;M=HardwareInfo.LastPollMessage}
${N=SwisEntity;M=HardwareInfo.LastPollStatus}
${N=SwisEntity;M=HardwareInfo.LastPollTime}
${N=SwisEntity;M=HardwareInfo.Manufacturer}
${N=SwisEntity;M=HardwareInfo.Model}
${N=SwisEntity;M=HardwareInfo.ParentObjectEntity}
${N=SwisEntity;M=HardwareInfo.ParentObjectID}
${N=SwisEntity;M=HardwareInfo.ParentObjectName}
${N=SwisEntity;M=HardwareInfo.ParentObjectStatus}
${N=SwisEntity;M=HardwareInfo.ParentObjectType}
${N=SwisEntity;M=HardwareInfo.ParentObjectVendor}
${N=SwisEntity;M=HardwareInfo.PollingMethod}
${N=SwisEntity;M=HardwareInfo.ServiceTag}
${N=SwisEntity;M=HardwareInfo.Status}
${N=SwisEntity;M=HardwareInfo.StatusDescription}

Hardware Category (Node):
${N=SwisEntity;M=HardwareCategoryStatus.DetailsUrl}
${N=SwisEntity;M=HardwareCategoryStatus.FullyQualifiedName}
${N=SwisEntity;M=HardwareCategoryStatus.HardwareCategoryName}
${N=SwisEntity;M=HardwareCategoryStatus.HardwareInfoID}
${N=SwisEntity;M=HardwareCategoryStatus.ID}
${N=SwisEntity;M=HardwareCategoryStatus.ItemsWithProblems}
${N=SwisEntity;M=HardwareCategoryStatus.ItemsWithStatus}
${N=SwisEntity;M=HardwareCategoryStatus.Status}
${N=SwisEntity;M=HardwareCategoryStatus.StatusDescription}

Hardware Sensor (Node):
${N=SwisEntity;M=DetailsUrl}
${N=SwisEntity;M=FullyQualifiedName}
${N=SwisEntity;M=HardwareCategoryID}
${N=SwisEntity;M=HardwareUnitDescription}
${N=SwisEntity;M=ID}
${N=SwisEntity;M=IsDisabled;F=TrueFalse}
${N=SwisEntity;M=Message}
${N=SwisEntity;M=Name}
${N=SwisEntity;M=OriginalStatus}
${N=SwisEntity;M=Status;F=Status}
${N=SwisEntity;M=StatusDescription}
${N=SwisEntity;M=UniqueName}
${N=SwisEntity;M=Unit}
${N=SwisEntity;M=Value}
