fail_timeout in upstream not rescpeted?

[plrunner]

Thank you very much for the quick reply.

OK, it's pretty clear now.

I've read the "zone" directive is available since nginx v1.9. 
For sake of other readers as well, does this mean that what am addressing
here is not possible to be solved in previous versions, isn't it?

Paolo

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,272189,272191#msg-272191