awolden / brakes / 420

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Pull #112

travis-ci

Added cumulative statistics to support request counter

As proposed in https://github.com/awolden/brakes/issues I added cumulative counters that are independent of buckets. These counter stream out total requests (timeouts, etc.) per breaker, as well as the diff between two report events. The latter is necessary to support Prometheus counters effectively.

Counters are supported and named aligned with the Hystrix Metrics and Monitoring guide: https://github.com/Netflix/Hystrix/wiki/Metrics-and-Monitoring

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