OM 2.0: Decision around __type__ and __unit__ labels in Text format

[bwplotka]

There is a proposal that makes it possible for the unit and type of the metric being part of the metric/metric family identification. This issue is about considering this an option and tracking the proposal for the spec changes.

There are a few key discussion points, if we would like to accept: prometheus/proposals#39

• Should we flatten the format (use type and unit labels instead of TYPE and UNIT); mix approach or not allow those labels?
• How to solve the problem of the OM 1.0 not allowing multiple metric families (essentially names)?

Sounds like this generally requires redefinition of metric family (to include type and unit).