Add 11 new VPN metrics and updated old metrics columns

* Documented 11 new VPN metrics
* Edited titles of all metrics to use *displayName* instead of *name* to match what customers see on portal
* Edited descriptions to be more concise and consistent with V WAN docs

Author: jaidharosenblatt

articles/vpn-gateway/monitor-vpn-gateway.md

@@ -15,18 +15,29 @@ ms.author: alzam
 You can monitor Azure VPN gateways using Azure Monitor. This article discusses metrics that are available through the portal. Metrics are lightweight and can support near real-time scenarios, making them useful for alerting and fast issue detection.
 
 
-|**Metric**   | **Unit** | **Granularity** | **Description** | 
-|---       | ---        | ---       | ---            | ---       |
-|**AverageBandwidth**| Bytes/s  | 5 minutes| Average combined bandwidth utilization of all site-to-site connections on the gateway.     |
-|**P2SBandwidth**| Bytes/s  | 1 minute  | Average combined bandwidth utilization of all point-to-site connections on the gateway.    |
-|**P2SConnectionCount**| Count  | 1 minute  | Count of point-to-site connections on the gateway.   |
-|**TunnelAverageBandwidth** | Bytes/s    | 5 minutes  | Average bandwidth utilization of tunnels created on the gateway. |
-|**TunnelEgressBytes** | Bytes | 5 minutes | Outgoing traffic on tunnels created on the gateway.   |
-|**TunnelEgressPackets** | Count | 5 minutes | Count of outgoing packets on tunnels created on the gateway.   |
-|**TunnelEgressPacketDropTSMismatch** | Count | 5 minutes | Count of outgoing packets dropped on tunnels caused by traffic-selector mismatch. |
-|**TunnelIngressBytes** | Bytes | 5 minutes | Incoming traffic on tunnels created on the gateway.   |
-|**TunnelIngressPackets** | Count | 5 minutes | Count of incoming packets on tunnels created on the gateway.   |
-|**TunnelIngressPacketDropTSMismatch** | Count | 5 minutes | Count of incoming packets dropped on tunnels caused by traffic-selector mismatch. |
+| **Metric**                                 | **Unit**     | **Granularity**     | **Description**                                                                         |
+| -------------------------------------------| ------------ | ------------------- | --------------------------------------------------------------------------------------- |
+| **BGP Peer Status**                        | Count        | 5 minutes           | Average BGP connectivity status per peer and per instance.                              |
+| **BGP Routes Advertised**                  | Count        | 5 minutes           | Number of routes advertised per peer and per instance.                                  |
+| **BGP Routes Learned**                     | Count        | 5 minutes           | Number of routes learned per peer and per instance.                                     |
+| **Gateway P2S Bandwidth**                  | Bytes/s      | 1 minute            | Average combined bandwidth utilization of all point-to-site connections on the gateway. |
+| **Gateway S2S Bandwidth**                  | Bytes/s      | 5 minutes           | Average combined bandwidth utilization of all site-to-site connections on the gateway.  |
+| **P2S Connection Count**                   | Count        | 1 minute            | Count of point-to-site connections on the gateway.                                      |
+| **Tunnel Bandwidth**                       | Bytes/s      | 5 minutes           | Average bandwidth utilization of tunnels created on the gateway.                        |
+| **Tunnel Egress Bytes**                    | Bytes        | 5 minutes           | Number of outgoing bytes from a tunnel.                                                 |
+| **Tunnel Egress Packet Drop Count**        | Count        | 5 minutes           | Number of outgoing packets dropped by a tunnel.                                         |
+| **Tunnel Egress Packets**                  | Count        | 5 minutes           | Number of outgoing packets from a tunnel.                                               |
+| **Tunnel Egress TS Mismatch Packet Drop**  | Count        | 5 minutes           | Number of outgoing packets dropped by tunnels caused by traffic-selector mismatch.      |
+| **Tunnel Ingress Bytes**                   | Bytes        | 5 minutes           | Number of incoming bytes to a tunnel.                                                   |
+| **Tunnel Ingress Packet Drop Count**       | Count        | 5 minutes           | Number of incoming packets dropped by a tunnel.                                         |
+| **Tunnel Ingress Packets**                 | Count        | 5 minutes           | Number of incoming packets to a tunnel.                                                 |
+| **Tunnel Ingress TS Mismatch Packet Drop** | Count        | 5 minutes           | Number of incoming packets dropped by tunnels caused by traffic-selector mismatch.      |
+| **Tunnel MMSA Count**                      | Count        | 5 minutes           | Number of main mode security associations present.                                      |
+| **Tunnel Peak PPS**                        | Count        | 5 minutes           | Max number of packets per second per tunnel.                                            |
+| **Tunnel QMSA Count**                      | Count        | 5 minutes           | Number of quick mode security associations present.                                     |
+| **Tunnel Total Flow Count**                | Count        | 5 minutes           | Number of distinct flows created per tunnel.                                            |
+| **User Vpn Route Count**                   | Count        | 5 minutes           | Number of user VPN routes configured on the VPN Gateway.                                |
+| **VNet Address Prefix Count**              | Count        | 5 minutes           | Number of VNet address prefixes that are used/advertised by the gateway.                |
 
 ## The following steps help you locate and view metrics: