The description of new features available in watchOS (and the Heart features in iOS 11's Health app) mention "Resting" and "Walking" rates. In fact the official description suggests that the Watch Heart app should be measuring these new categories:
But I don't see any measurements of these categories at all (after several days of lots of resting and walking), nor do I even see Watch listed among the relevant sources in Health on iOS.
Are these features actually available? Are they only available on certain Watch models?