Revert ":arrow_up: metrics@1.2.7"
Revert ":arrow_up: metrics@1.2.7"

This reverts commit b81e33c372e8c917f5ebc585033e1f692a84ff7d.

b81e33c372e8c917f5ebc585033e1f692a84ff7d *seems* to be causing some
tests to time-out on CI:

https://circleci.com/gh/atom/atom/7707
https://circleci.com/gh/atom/atom/7708
https://circleci.com/gh/atom/atom/7709

Let's revert that change for now so that we can get CI green again while
we search for the exact cause of those time-outs.

stinsonga/atom,PKRoma/atom,brettle/atom,stinsonga/atom,atom/atom,liuderchi/atom,PKRoma/atom,stinsonga/atom,liuderchi/atom,Mokolea/atom,brettle/atom,Mokolea/atom,liuderchi/atom,andrewleverette/atom,atom/atom,atom/atom,andrewleverette/atom,andrewleverette/atom,t9md/atom,brettle/atom,t9md/atom,Mokolea/atom,PKRoma/atom,t9md/atom,stinsonga/atom,liuderchi/atom