A conveyor roller has a drum shell and an end lid that has an end lid, an embossed spring band, and a mounting face that is affixed to an axial end of the drum shell. In various examples a plurality of queues are configured at one or more stages of the end-to-end flow and controlled to adhere to a policy. At least some of the servers can be characterized by a hierarchy of partitions. One or more second units of physiological data are received from a second monitoring device.