Is this error critical?

I don’t understand , What is this error ??
Thank you for supports

It’s all good, select is the least preferred poller and and is ignored here, likely because the configuration would justify more then 1024 FDs which doesn’t reliable work, as per:

http://docs.haproxy.org/2.6/configuration.html#3.2-maxconn

The important thing is that epoll is OK.

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so it’s not critical, is it?

No, its not critical, it should be ignored.