public static Builder builder() {
        return new Builder();
    }
@Test
    public void testEqualsAndHashCode() {
        DubboUpstream upstream1 = DubboUpstream.builder().protocol("protocol").upstreamHost("host").upstreamUrl("url")
                .status(true).warmup(50).timestamp(1650549243L).weight(100).build();
        DubboUpstream upstream2 = DubboUpstream.builder().protocol("protocol").upstreamHost("host").upstreamUrl("url")
                .status(true).warmup(50).timestamp(1650549243L).weight(100).build();
        
        assertThat(ImmutableSet.of(upstream1, upstream2), hasSize(1));
    }