public static ValueLabel formatBytes(long bytes) {
        return new ValueLabel(bytes, BYTES_UNIT);
    }
@Test
    public void formatMegaBytes() {
        vl = TopoUtils.formatBytes(3_000_000L);
        assertEquals(AM_WM, TopoUtils.Magnitude.MEGA, vl.magnitude());
        assertEquals(AM_WL, "2.86 MB", vl.toString());
    }