Merge pull request #197886 from mialdrid/patch-151

Add maintenance note

Author: PRMerger8

articles/expressroute/expressroute-about-virtual-network-gateways.md

@@ -81,7 +81,7 @@ The following table shows the gateway types and the estimated performance scale
 |**Ultra Performance/ErGw3Az**|16,000|10,000|1,000,000|11,000|
 
 > [!IMPORTANT]
-> Application performance depends on multiple factors, such as the end-to-end latency, and the number of traffic flows the application opens. The numbers in the table represent the upper limit that the application can theoretically achieve in an ideal environment.
+> Application performance depends on multiple factors, such as the end-to-end latency, and the number of traffic flows the application opens. The numbers in the table represent the upper limit that the application can theoretically achieve in an ideal environment. Additionally, Microsoft performs routine host and OS maintenance on the ExpressRoute Virtual Network Gateway, to maintain reliability of the service. During a maintenance period, control plane and data path capacity of the gateway is reduced.
 
 >[!NOTE]
 > The maximum number of ExpressRoute circuits from the same peering location that can connect to the same virtual network is 4 for all gateways.