Histogram(t *testing.T) {  cfg0 := goldendataset.DefaultCfg()  cfg0.MetricDescriptorType = pdata.MetricDataTypeDoubleHistogram  expected := goldendataset.MetricDataFromCfg(cfg0)  cfg0 := goldendataset.DefaultCfg()  cfg0.MetricDescriptorType = pdata.MetricDataTypeDoubleHistogram  cfg0.PtVal = 0  actual := goldendataset.MetricDataFromCfg(cfg0)  diffs := diffMetricData(expected, actual)  assert.Len(t, diffs, 0) }  func Test