liqiangz

General Design for Metrics(memory、cpu...) adaptive flow control

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### Describe what this PR does / why we need it General Design for Metrics(memory、cpu...) adaptive flow control ### Does this pull request fix one issue? Fixes #368 ### Describe...

Use W-TinyLFU algorithm to enhance the LRU cache

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### Describe what this PR does / why we need it Run testHitRateTest Use Zipf's law(https://en.wikipedia.org/wiki/Zipf%27s_law) to test hitRate Refer to https://blog.openacid.com/tech/zipf/ tinyLfu cache size 100, total 2000000, miss 1220740,...

## Issue Description Type: *feature request* ### Describe what feature you want We should check if we get CurrentLoad and CurrentCpuUsage in the System module ``` golang case Load: l...

Support blocked log recording

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### Describe what this PR does / why we need it Support blocked log recording log example : 2020-10-20 22:52:10|some-test22|FlowControl|2000 time|resource name|block type|block times ### Does this pull request fix...