Adding slow pump detection to web_conn and better metrics (#6114)

* Adding slow pump detection to web_conn and better metrics

* Fixing bad merge

* Fixing typo

einterfaces/metrics.go

@@ -33,6 +33,7 @@ type MetricsInterface interface {
 	IncrementMemCacheHitCounterSession()
 
 	IncrementWebsocketEvent(eventType string)
+	IncrementWebSocketBroadcast(eventType string)
 
 	AddMemCacheHitCounter(cacheName string, amount float64)
 	AddMemCacheMissCounter(cacheName string, amount float64)