public void Observe()
{
noLabel.Observe(2);
Assert.Equal(1, noLabel.Count());
Assert.Equal(2, noLabel.Sum());
Assert.Equal(0, noLabel.BucketValue(1));
Assert.Equal(1, noLabel.BucketValue(2.5));
noLabel.WithLabels().Observe(4);
Assert.Equal(2, noLabel.Count());
Assert.Equal(6, noLabel.Sum());
Assert.Equal(0, noLabel.BucketValue(1));
Assert.Equal(1, noLabel.BucketValue(2.5));
Assert.Equal(2, noLabel.BucketValue(5));
Assert.Equal(2, noLabel.BucketValue(7.5));
Assert.Equal(2, noLabel.BucketValue(10));
Assert.Equal(2, noLabel.BucketValue(double.PositiveInfinity));
}
