@Entrance
    public final void combine(@SourceFrom long count) {
        if (count > this.value) {
            this.value = count;
        }
    }
@Test
    public void testSelfCombine() {
        MaxLongMetricsImpl impl = new MaxLongMetricsImpl();
        impl.combine(10);
        impl.combine(5);

        MaxLongMetricsImpl impl2 = new MaxLongMetricsImpl();
        impl2.combine(2);
        impl2.combine(6);

        impl.combine(impl2);
        Assertions.assertEquals(10, impl.getValue());
    }