code: func (r *Ruler) Rule(path string) *RulerRule {
  	rule := &Rule{
  		"",
  		path,
  		nil,
  	}
  
  	r.rules = append(r.rules, rule)
  
  	return &RulerRule{
  		r,
  		rule,
  	}
  }
docs: // adds a new rule for the property at `path`
  // returns a RulerFilter that you can use to add conditions
  // and more filters