This integer reports, again in hundredths of a volt, the voltage this specific rail is actually measured to be delivering right now, to be compared directly against the nominal value in uchasPowerSupplyOutNominalVolt for that same rail. Notably the description flags a quirk an admin must code around: if uchasPowerSupplyOutStatus reports good(4), a reading of exactly 0 here specifically means the measurement itself just isn't available, not that the rail has dropped to zero volts -- so this field can't be read in isolation from the status object. For example, an admin's monitoring script comparing offered vs nominal voltage must first check the corresponding status field, since a naive 0-volt threshold alarm would false-positive on a perfectly healthy rail whose measurement simply wasn't reported.