batch error for decoder (template warnings)

cmd/goflow2/main.go

@@ -279,6 +279,8 @@ func main() {
 		decodeFunc = metrics.PromDecoderWrapper(p.DecodeFlow, listenAddrUrl.Scheme)
 		pipes = append(pipes, p)
 
+		bm := utils.NewBatchMute(*ErrInt, *ErrCnt)
+
 		// starts receivers
 		// the function either returns an error
 		if err := recv.Start(hostname, int(port), decodeFunc); err != nil {
@@ -293,13 +295,25 @@ func main() {
 					case <-q:
 						return
 					case err := <-recv.Errors():
-						l := l.WithError(err)
-						if errors.Is(err, netflow.ErrorTemplateNotFound) {
-							l.Warn("template error")
-						} else if errors.Is(err, net.ErrClosed) {
+
+						if errors.Is(err, net.ErrClosed) {
 							l.Info("closed receiver")
-						} else {
+							continue
+						} else if !errors.Is(err, netflow.ErrorTemplateNotFound) {
 							l.Error("error")
+							continue
+						}
+
+						muted, skipped := bm.Increment()
+						if muted && skipped == 0 {
+							log.Warn("too many receiver messages, muting")
+						} else if !muted && skipped > 0 {
+							log.Warnf("skipped %d receiver messages", skipped)
+						} else if !muted {
+							l := l.WithError(err)
+							if errors.Is(err, netflow.ErrorTemplateNotFound) {
+								l.Warn("template error")
+							} 
 						}
 
 					}