429 -> 503

cmd/example-gcp/main.go

@@ -73,7 +73,7 @@ func main() {
 		if err != nil {
 			if errors.Is(err, tessera.ErrPushback) {
 				w.Header().Add("Retry-After", "1")
-				w.WriteHeader(http.StatusTooManyRequests)
+				w.WriteHeader(http.StatusServiceUnavailable)
 				return
 			}
 			w.WriteHeader(http.StatusInternalServerError)

log.go

@@ -29,7 +29,7 @@ const DefaultBatchMaxSize = 1
 // entries with indices assigned but which have not yet been integrated into the tree.
 //
 // Personalities encountering this error should apply back-pressure to the source of new entries
-// in an appropriate manner (e.g. for HTTP services, return a 429 with a Retry-After header).
+// in an appropriate manner (e.g. for HTTP services, return a 503 with a Retry-After header).
 var ErrPushback = errors.New("too many unintegrated entries")
 
 // NewCPFunc is the signature of a function which knows how to format and sign checkpoints.