Metrics wiki page is missing the unit of measure

[julienlim]

The Metrics wiki page is missing the unit of measure (i.e. https://github.com/Tendrl/documentation/wiki/Metrics). E.g. for Memory metrics, is it in bytes, kbytes, Mbytes, etc.? Can the documented metrics unit of measure be listed/documented for each metric?

It will be needed for any level of reporting or aggregation that any consumer of the metrics.

@anmolbabu @cloudbehl @Tendrl/qe @Tendrl/tendrl-core

[r0h4n]

@cloudbehl please fix this