code: func (f *featureGate) KnownFeatures() []string {
  	var known []string
  	for k, v := range f.known.Load().(map[Feature]FeatureSpec) {
  		if v.PreRelease == GA || v.PreRelease == Deprecated {
  			continue
  		}
  		known = append(known, fmt.Sprintf("%s=true|false (%s - default=%t)", k, v.PreRelease, v.Default))
  	}
  	sort.Strings(known)
  	return known
  }
docs: // KnownFeatures returns a slice of strings describing the FeatureGate's known features.
  // Deprecated and GA features are hidden from the list.