Track ratio of reduced bundle and every blacklist event

Ratio of reduced bundle will show how much of the traffic is not sent immediatly
by a peer.
Blacklist meter will show if network is spammed and peers are getting blacklisted.

whisperv6/metrics.go

@@ -13,4 +13,6 @@ var (
 	envelopeErrLowPowCounter       = metrics.NewRegisteredCounter("whisper/envelopeErrLowPow", nil)
 	envelopeErrNoBloomMatchCounter = metrics.NewRegisteredCounter("whisper/envelopeErrNoBloomMatch", nil)
 	envelopeSizeMeter              = metrics.NewRegisteredMeter("whisper/envelopeSize", nil)
+	peerBundleRatio                = metrics.NewRegisteredGaugeFloat64("whisper/bundleRatio", nil)
+	peerBlacklistMeter             = metrics.NewRegisteredMeter("whisper/blacklistMeter", nil)
 )

whisperv6/peer.go

@@ -233,7 +233,9 @@ func (peer *Peer) broadcast() error {
 	}
 	// bundle will be reduce according to a rate limiter
 	// if rate limiter is nil - this operation is noop
+	original := len(bundle)
 	bundle = peer.reduceBundle(bundle)
+	peerBundleRatio.Update(float64(len(bundle)) / float64(original))
 	if len(bundle) > 0 {
 		// transmit the batch of envelopes
 		if err := p2p.Send(peer.ws, messagesCode, bundle); err != nil {

whisperv6/whisper.go

@@ -937,6 +937,7 @@ func (whisper *Whisper) runMessageLoop(p *Peer, rw p2p.MsgReadWriter) error {
 		packet.Discard()
 
 		if blacklist {
+			peerBlacklistMeter.Mark(1)
 			whisper.ratelimiter.Ingress.Remove(p.peer, 10*time.Minute)
 			return fmt.Errorf("peer %v reached traffic limit capacity", p.peer.ID())
 		}