code: func (ncc NumCPUCheck) Check() (warnings, errorList []error) {
  	numCPU := runtime.NumCPU()
  	if numCPU < ncc.NumCPU {
  		errorList = append(errorList, errors.Errorf("the number of available CPUs %d is less than the required %d", numCPU, ncc.NumCPU))
  	}
  	return warnings, errorList
  }
docs: // Check number of CPUs required by kubeadm