The number of embedded fields traversed
to reach <code>f</code> is called its <i>depth</i> in <code>T</code>.
The depth of a field or method <code>f</code>
declared in <code>T</code> is zero.
The depth of a field or method <code>f</code> declared in
an embedded field <code>A</code> in <code>T</code> is the
depth of <code>f</code> in <code>A</code> plus one.
</p>

<p>

- Extends functionality to kubectl to support extensions adding new commands as well as overriding specific subcommands (at any depth).
- Documentation fixes
kubernetes/enhancements: [#579](https://github.com/kubernetes/enhancements/issues/579) [[kep](https://github.com/kubernetes/enhancements/blob/master/keps/sig-cli/0024-kubectl-plugins.md#summary)]