Update monitor-virtual-wan-reference.md

Author: MSFT-FrankLpnsk

articles/virtual-wan/monitor-virtual-wan-reference.md

@@ -88,13 +88,15 @@ You can review per peer and instance metrics by selecting **Apply splitting** an
 | Metric | Description|
 | --- | --- |
 | **Gateway Bandwidth** | Average site-to-site aggregate bandwidth of a gateway in bytes per second.|
+| **Gateway Inbound Flows** | Number of distinct 5-tuple flows (protocol, local IP address, remote IP address, local port, and remote port) flowing into a VPN Gateway. Limit is 250k flows.|
+| **Gateway Outbound Flows** | Number of distinct 5-tuple flows (protocol, local IP address, remote IP address, local port, and remote port) flowing out of a VPN Gateway. Limit is 250k flows.|
 | **Tunnel Bandwidth** | Average bandwidth of a tunnel in bytes per second.|
 | **Tunnel Egress Bytes** | Outgoing bytes of a tunnel. |
 | **Tunnel Egress Packets** | Outgoing packet count of a tunnel. |
 | **Tunnel Ingress Bytes** | Incoming bytes of a tunnel.|
 | **Tunnel Ingress Packet** | Incoming packet count of a tunnel.|
 | **Tunnel Peak PPS** | Number of packets per second per link connection in the last minute.|
-| **Tunnel Flow Count** | Number of distinct flows created per link connection.|
+| **Tunnel Flow Count** | Number of distinct 3-tupe (protocol, local IP address, remote IP address) flows created per link connection.|
 
 ### <a name="p2s-metrics"></a>Point-to-site VPN gateway metrics