nginx_upstream_check_module
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upstream server不可用日志提示不够直观
1.20.1打patch后 后端server不可用日志如下: 2021/08/24 13:43:21 [error] 763346#0: send() failed (111: Connection refused)
1.12.1打patch后 后端server不可用日志如下: 2021/08/24 15:01:59 [error] 17871#0: check time out with peer: 10.8.20.3:6001
如果能跟1.12.1就更好了