feat: add a log line for knowing when a keyspace event is received

Signed-off-by: Manan Gupta <[email protected]>

go/vt/vtgate/buffer/buffer.go

@@ -89,7 +89,7 @@ func CausedByFailover(err error) bool {
 	log.V(2).Infof("Checking error (type: %T) if it is caused by a failover. err: %v", err, err)
 	reason, isFailover := isFailoverError(err)
 	if isFailover {
-		log.V(2).Infof("CausedByFailover signalling failover for reason: %s", reason)
+		log.Infof("CausedByFailover signalling failover for reason: %s", reason)
 	}
 	return isFailover
 }
@@ -208,6 +208,7 @@ func (b *Buffer) WaitForFailoverEnd(ctx context.Context, keyspace, shard string,
 }
 
 func (b *Buffer) HandleKeyspaceEvent(ksevent *discovery.KeyspaceEvent) {
+	log.Infof("Keyspace Event received for keyspace %v", ksevent.Keyspace)
 	for _, shard := range ksevent.Shards {
 		sb := b.getOrCreateBuffer(shard.Target.Keyspace, shard.Target.Shard)
 		if sb != nil {