perf: remove useless stat checking logic #11178
Merged
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What this PR does / why we need it?
每一个请求都stat一遍有点太浪费了,而且没有必要。
Summary of your change
移除os.stat,换成超时 dial 逻辑,超时即报 502 错误。测试 agent 挂掉时这个新逻辑不影响 core,agent再启动也没有影响
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