field_definition doc improved with the definition of host entity timestamp
field_definition doc improved with the definition of host entity timestamp

attybro/FIWARELab-monitoringAPI,SmartInfrastructures/FIWARELab-monitoringAPI,attybro/xifi-monitoringAPI,SmartInfrastructures/FIWARELab-monitoringAPI,SmartInfrastructures/FIWARELab-monitoringAPI