orca: split cost and utilization into separate maps. (#7254)
orca: split cost and utilization into separate maps. (#7254)

The cost and utilization are fundamentally different in the way they
are defined.  There is no benefit to stuff them together, and only
causes confusion and difficulties in aggregation should anyone ever
try to do it.

Signed-off-by: Kun Zhang <9ad9ab33b61e252375b7b80b98bec0758263fa6b@google.com>
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