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[close #1577] Negative Backpressure Metric
This PR introduces the `pool_capacity` stat which can be used as a “negative back pressure metric”. What does a “negative backpressure metric” mean? It means when this number is low, we have a higher amount of backpressure. When it is zero it means that our worker has no ability to process additional requests. This information could be used to scale out by adding additional servers. When that happens the requests should be re-distributed between the extra server and the “pool capacity” number for each individual server should go up.
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