upgrade 4.0.2

fix: send mail not work(wrong notifyType and subject) (ccfos#660)

support static files

upgrade 3.8.0

Merge branch 'master' of https://github.com/didi/nightingale

upgrade 3.7.0

修改k8s-mon ksm，控制平面大盘 (ccfos#567)

* m3db writetagged应该并发做，不然会导致transfer rpc变慢

* go func指针传参问题

* 新增k8s-mon三个大盘文件

* 新增k8s-mon三个大盘文件

* 修改k8s-mon三个大盘文件

code refactor

release 3.5.1

add doc