Support degrade by exception count #174
Merged
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Describe what this PR does / why we need it
DegradeRule only have two type now, one is by RT, the other is by exception ratio. Degrade by exception count is not supported, which is necessary in the real case.
Does this pull request fix one issue?
Fixes #173
Describe how you did it
Add a new DegradeRule type, degrade by exception count in the last minute. Degradation will be triggered if exception count in the last 60 seconds greats than or equals to the threshold.
Describe how to verify it
See test cases.
Special notes for reviews
None