Sync with alibaba/master #5
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…rove strategy * Add `CircuitBreaker` abstraction (with half-open state) and add circuit breaker state change event observer support. * Improve circuit breaking strategy (avg RT → slow request ratio) and make statistics of each rule dependent (to support arbitrary statistic interval). * Add simple "trial" mechanism (aka. half-open). * Refactor mechanism of metric recording and state change handling for circuit breakers: record RT and error when requests have completed (i.e. `onExit`, based on #1420). Signed-off-by: Eric Zhao <sczyh16@gmail.com>
Signed-off-by: Eric Zhao <sczyh16@gmail.com>
Signed-off-by: Eric Zhao <sczyh16@gmail.com>
…uarkus Signed-off-by: Eric Zhao <sczyh16@gmail.com>
Signed-off-by: Eric Zhao <sczyh16@gmail.com>
Signed-off-by: yunfeiyanggzq <yunfeiyang@buaa.edu.cn>
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Describe what this PR does / why we need it
Sync with alibaba/master
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