chore: adding metric observable to be able to support async update#964

Merged

dyladan merged 8 commits intoopen-telemetry:masterfrom obecny:metric_observable

Apr 22, 2020

+191-34

Commits on Apr 13, 2020

Commits on Apr 14, 2020

Merge branch 'master' into metric_observable
obecny
committed

Commits on Apr 15, 2020

Commits on Apr 22, 2020