Ruler: adding pkg/metrics
from agent
#4354
Merged
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What this PR does / why we need it:
We need this code as a prerequisite for #4344.
Significant changes have been made to this code, and the best way to show those is to merge this first and then rebase #4344.
Which issue(s) this PR fixes:
N/A
Special notes for your reviewer:
Many tests will break. This is expected, and will be corrected in #4344.
Checklist