code: func SetDefaults_BootstrapToken(bt *BootstrapToken) {
  	if bt.TTL == nil {
  		bt.TTL = &metav1.Duration{
  			Duration: constants.DefaultTokenDuration,
  		}
  	}
  	if len(bt.Usages) == 0 {
  		bt.Usages = constants.DefaultTokenUsages
  	}
  
  	if len(bt.Groups) == 0 {
  		bt.Groups = constants.DefaultTokenGroups
  	}
  }
docs: // SetDefaults_BootstrapToken sets the defaults for an individual Bootstrap Token