Exhaustive data has nerd appeal, but in practice, you'd add power, circuitry, and RF noise overhead to mostly see signals that maintain very stable patterns for as long as the same thing is plugged into it and used in mostly the same way (i.e. for months or years).

All you really need is snapshot understanding of what a device really consumes, and only then if it's non-negligible and some alternative might make sense.

For outlets and receptacles, you can achieve that by just inserting a meter where you want. Per-circuit metering in the distribution/circuit breaker panel would be nice though.