>
>
> It is the number of keepalive connections to be cached for the
> whole upstream{} block, that is, all servers.
>

Can we clarify the behavior for upstreams with duplicate server directives?
Consider the following

upstream foo {
server 1.2.3.4:80;
server 5.6.7.8:80;

keepalive 32;
}

upstream bar {
server 1.2.3.4:80;
server 5.6.7.8:80;

keepalive 32;
}

A max of 64 TCP connections will be kept open?
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