Merge pull request #235246 from duongau/ermetrics

ExpressRoute - Metrics - add active flows and max flow per seconds

Author: v-shils

articles/expressroute/expressroute-monitoring-metrics-alerts.md

@@ -64,7 +64,9 @@ Metrics explorer supports SUM, MAX, MIN, AVG and COUNT as [aggregation types](..
 | [Count of routes advertised to peer](#advertisedroutes) | Availability | Count | Maximum | Count Of Routes Advertised To Peer by ExpressRouteGateway | roleInstance | Yes | 
 | [Count of routes learned from peer](#learnedroutes)| Availability | Count | Maximum | Count Of Routes Learned From Peer by ExpressRouteGateway | roleInstance | Yes | 
 | [Frequency of routes changed](#frequency) | Availability | Count | Total | Frequency of Routes change in ExpressRoute Gateway | roleInstance | Yes | 
-| [Number of VMs in virtual network](#vm) | Availability | Count | Maximum | Number of VMs in the Virtual Network | No Dimensions | Yes | 
+| [Number of VMs in virtual network](#vm) | Availability | Count | Maximum | Number of VMs in the Virtual Network | No Dimensions | Yes |
+| [Active flows](#activeflows) | Scalability | Count | Average | Number of active flows on ExpressRoute Gateway | roleInstance | Yes |
+| [Max flows created per second](#maxflows) | Scalability | FlowsPerSecond | Maximum | Maximum number of flows created per second on ExpressRoute Gateway | roleInstance, direction | Yes |
 
 ### ExpressRoute Gateway connections
 
@@ -223,7 +225,9 @@ When you deploy an ExpressRoute gateway, Azure manages the compute and functions
 * Count of routes advertised to peers
 * Count of routes learned from peers
 * Frequency of routes changed
-* Number of VMs in the virtual network  
+* Number of VMs in the virtual network
+* Count of active flows
+* Max flows created per second
 
 It's highly recommended you set alerts for each of these metrics so that you're aware of when your gateway could be seeing performance issues.
 
@@ -287,6 +291,27 @@ This metric shows the number of virtual machines that are using the ExpressRoute
 > To maintain reliability of the service, Microsoft often performs platform or OS maintenance on the gateway service. During this time, this metric may fluctuate and report inaccurately.
 >
 
+## <a name = "activeflows"></a>Active flows
+
+Aggregation type: *Avg*
+
+Split by: Gateway Instance
+
+
+This metric displays a count of the total number of active flows on the ExpressRoute Gateway. Through split at instance level, you can see active flow count per gateway instance. For more information, see [understand network flow limits](../virtual-network/virtual-machine-network-throughput.md#network-flow-limits).
+
+:::image type="content" source="./media/expressroute-monitoring-metrics-alerts/active-flows.png" alt-text="Screenshot of number of active flows per second metrics dashboard.":::
+
+## <a name = "maxflows"></a>Max flows created per second
+
+Aggregation type: *Max*
+
+Split by: Gateway Instance and Direction (Inbound/Outbound)
+
+This metric display maximum number of flows created per second on the ExpressRoute Gateway. Through split at instance level and direction, you can see max flow creation rate per gateway instance and inbound/outbound direction respectively. For more information, see [understand network flow limits](../virtual-network/virtual-machine-network-throughput.md#network-flow-limits).
+
+:::image type="content" source="./media/expressroute-monitoring-metrics-alerts/max-flows-per-second.png" alt-text="Screenshot of the maximum number of flows created per second metrics dashboard.":::
+
 ## <a name = "connectionbandwidth"></a>ExpressRoute gateway connections in bits/seconds
 
 Aggregation type: *Avg*