Process metric in parallel

[JorTurFer]

Proposal

After adding scaling modifiers, we could need to request multiple metrics (as sources) for giving the computed value. As this hasn't been a requirement before because the HPA controller requests them one by one, now we can produce a bottleneck if there are too much metrics to request for calculating the formula.

We should request them in parallel to speed up the process

Use-Case

No response

Is this a feature you are interested in implementing yourself?

Yes

Anything else?

No response