Should Metric define the Unit it measures?

[jboynes]

When recording a measurement, the caller has to specify the units of the measurement:

record(Metric label, Number value, Unit unit, Instant time)

This has the potential for different units to be used in different places for the same Metric. How about having the Metric define the canonical unit? That way, application code need not supply it, or if we allow it to, the recorder would then be able to convert it to the canonical unit for consistency.

[jerpowers]

That's not a bad idea.
https://github.com/awslabs/swage/blob/master/metrics-api/src/main/java/software/amazon/swage/metrics/Metric.java#L33