@Override
    public ServerGroup servers() {
        return cache.get();
    }
@Test
    public void all_up_but_other_endpoint_down() {
        NginxHealthClient service = createClient("nginx-health-output-all-up-but-other-down.json");
        assertTrue(service.servers().isHealthy("gateway.prod.music.vespa.us-east-2.prod"));
        assertFalse(service.servers().isHealthy("frog.prod.music.vespa.us-east-2.prod"));
    }