code: func ValidateLeaseUpdate(lease, oldLease *coordination.Lease) field.ErrorList {
  	allErrs := validation.ValidateObjectMetaUpdate(&lease.ObjectMeta, &oldLease.ObjectMeta, field.NewPath("metadata"))
  	allErrs = append(allErrs, ValidateLeaseSpec(&lease.Spec, field.NewPath("spec"))...)
  	return allErrs
  }
docs: // ValidateLeaseUpdate validates an update of Lease object.