The adaptive package is implementation of Client-Side Throttling described in the Handling Overload chapter of Google's Site Reliability Engineering book.
Rather than traditional circuit breakers which are either closed or open (on or off) and thus allow all traffic or none client side throttling attempts to predict what the service can currently handle. When there have been recent failures, it attempts to limit requests to some multiple of the recent successes, such as 2x the number of successful requests in the last 30 seconds. This better handles overload situations, continuing to allow some load, and otherwise behaves similarly to a circuit breaker when a service is completely down.
This is a fork of an internal package from Google's grpc-go, modified to expose its functionality as public interfaces and not rely on another internal package. It retains 100% test coverage.
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