public static Predicate<InetAddress> preferredIpV4Addresses() {
        return PREFERRED_IP_V4_ADDRESSES;
    }
Returns the {@link Predicate} that is used to choose the non-loopback IP v4 address in
{@link SystemInfo#defaultNonLoopbackIpV4Address()}.

<p>This flag by default returns a {@link Predicate} that always returns {@code true},
which means all valid IPv4 addresses are preferred.
Specify the {@code -Dcom.linecorp.armeria.preferredIpV4Addresses=<csv>} JVM option to override the
default value. The {@code csv} should be
<a href="https://datatracker.ietf.org/doc/rfc4632/">Classless Inter-domain Routing(CIDR)</a>s or
exact IP addresses separated by commas. For example,
{@code -Dcom.linecorp.armeria.preferredIpV4Addresses=211.111.111.111,10.0.0.0/8,192.168.1.0/24}.
core/src/main/java/com/linecorp/armeria/common/Flags.java