Resource utilization asks how much memory, storage, network, processor time or energy the product consumes while doing its work. A measure relates consumption to the work performed. Consumption without a work unit is not a measure. The same product consumes more when it does more, so the useful form is a rate: memory per session, storage per record, energy per transaction. The 2023 model adds environmental sustainability under performance efficiency, and the draft gives it no separate family, which makes this family the natural home for an energy measure if a team needs one. The measure should say which resource, which instrument and which work unit.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.