code: func Matcher(label labels.Selector, field fields.Selector) pkgstorage.SelectionPredicate {
  	return pkgstorage.SelectionPredicate{
  		Label:       label,
  		Field:       field,
  		GetAttrs:    GetAttrs,
  		IndexFields: []string{"metadata.name"},
  	}
  }
docs: // Matcher returns a generic matcher for a given label and field selector.