https://jira.hl7.org/browse/FHIR-32271 has been approved to eliminate Device.parent and DeviceDefinition.parentDevice. Consider if DeviceMetric's source and parent elements need to be modified to align.

Also, regardless of whether a change is made to align, please update the short definitions of source/parent to more clearly distinguish. The current long description of parent actually seems to me to describe the source. Please ensure the long descriptions of the elements are correct, clear, and descriptive.