add high cardinality tags and routing #10
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High cardinality metrics
We currently do not want to push high cardinality metrics to datadog. In staging we are testing a supplementary system that can handle high cardinality.
This PR introduces
HighCardinalityCollectorthat separates tags into low and high cardinality tagsCollectorinstances as aHighCardinalityCollector(one for high cardinality metrics, one for low cardinality metrics)