public EurekaUpdatingListenerBuilder ipAddr(String ipAddr) {
        instanceInfoBuilder.ipAddr(ipAddr);
        return this;
    }
Sets the IP address. {@link SystemInfo#defaultNonLoopbackIpV4Address()} is set if not specified.
eureka/src/main/java/com/linecorp/armeria/server/eureka/EurekaUpdatingListenerBuilder.java