Make enum for units consistent. Partially addresses #4.
Make enum for units consistent. Partially addresses #4.

Signed-off-by: Heiko W. Rupp <b84916873c63a5de92f08628798bc3f70d9f6496@redhat.com>

Channyboy/microprofile-metrics,pilhuhn/microprofile-metrics,raymondlam/microprofile-metrics,Arjun-Sharma1/microprofile-metrics,pilhuhn/microprofile-metrics,Channyboy/microprofile-metrics,raymondlam/microprofile-metrics,Arjun-Sharma1/microprofile-metrics