Rework static metric names and add new routing layer #205
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This PR is the culmination of two changes/bits of functionality: static metric names (no more
NameParts) and a new layer,Router, for routing metrics to certain targets.Admittedly, the bigger change is the reworking of metric names, but we did it in service of the routing layer to make it possible to be faster and have simpler code, and on balance, it seems to be better across the board, performance-wise.