Add common tags for stats backends that support it#7651

Merged

deepthi merged 7 commits intovitessio:masterfrom 5antelope:ywu/stats

Apr 13, 2021

+112-46

Commits on Mar 16, 2021

trim and improve test
5antelope
committed

Commits on Mar 17, 2021

rm useless log
5antelope
committed

Commits on Mar 19, 2021

fix error
5antelope
committed