pull metrics for physical cpu but not cores

[danielarkins]

Feature Request

Opening a feature request kicks off a discussion.

Proposal: Define a way to collect total and per physical cpu metrics, but not per core

Current behavior:

percpu returns cores as reported by OS

Desired behavior:

only pull metrics for physical cpus (ie for a box with 48 cores and 4 cpus, i would like to only get 5 metrics (4 physical + total)

Use case:

[danielnelson]

Perhaps we can add a tag with the physical cpu id, then you could either group at query time or with an aggregator.

[danielnelson]

related #4256