code: func ValidKeyTokens(name string, tags Tags) bool {
  	if !ValidKeyToken(name) {
  		return false
  	}
  	for _, tag := range tags {
  		if !ValidKeyToken(string(tag.Key)) || !ValidKeyToken(string(tag.Value)) {
  			return false
  		}
  	}
  	return true
  }
docs: // ValidKeyTokens returns true if the measurement name and all tags are valid.