could lighthouse-ci let me know when I don't need to lower assertion metrics any more?

[BrianHicks]

Is your feature request related to a problem? Please describe.

I'm working on speeding up a slower site, and I'd like to know from lighthouse CI when I can turn of my lowered metrics and use the recommendations instead.

Describe the solution you'd like

An alert (failure or warning, configurable) when both the overridden and builtin assertion pass.

Describe alternatives you've considered

I haven't considered other alternatives, and this is definitely a nice-to-have, but… it sure would be nice to have!