code: func (a *Agent) DisableNodeMaintenance() {
  	if _, ok := a.State.Checks()[structs.NodeMaint]; !ok {
  		return
  	}
  	a.RemoveCheck(structs.NodeMaint, true)
  	a.logger.Printf("[INFO] agent: Node left maintenance mode")
  }
docs: // DisableNodeMaintenance removes a node from maintenance mode