Function firstLookupError

pkg/engine/lookup_classify.go:327–337

firstLookupError picks the most operator-relevant error from the two paths through which `helpers.ForEachResource` reports failure: the direct return value (resource-definition resolution against the first endpoint) and the per-node multierror that accumulates callback failures (per-node dial issues

(helperErr error, multiErr *multierror.Error)

// errors verbatim so classifyLookupError downstream can read the
// gRPC status code without unwrapping noise.
func firstLookupError(helperErr error, multiErr *multierror.Error) error {
	if helperErr != nil {
		return helperErr
	}

	if multiErr == nil || len(multiErr.Errors) == 0 {
		return nil
	}

	return multiErr.Errors[len(multiErr.Errors)-1]
}

// retryableLookupError reports whether a failure class is worth
// retrying. Only transient connectivity failures qualify: refused