Merge pull request #203111 from mialdrid/patch-165

Lane split for Tx/Rx Light Levels

Author: PRMerger-2

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

@@ -167,6 +167,10 @@ You can view the Rx light level (the light level that the ExpressRoute Direct po
 
 :::image type="content" source="./media/expressroute-monitoring-metrics-alerts/rxlight-level-per-link.jpg" alt-text="ER Direct line Rx Light Level":::
 
+>[!NOTE]
+> ExpressRoute Direct connectivity is hosted across different device platforms. Some ExpressRoute Direct connections will support a split view for Rx light levels by lane. However, this is not supported on all deployments.
+>
+
 ### <a name = "txlight"></a>Tx Light Level - Split by link
 
 Aggregation type: *Avg*
@@ -175,6 +179,10 @@ You can view the Tx light level (the light level that the ExpressRoute Direct po
 
 :::image type="content" source="./media/expressroute-monitoring-metrics-alerts/txlight-level-per-link.jpg" alt-text="ER Direct line Tx Light Level":::
 
+>[!NOTE]
+> ExpressRoute Direct connectivity is hosted across different device platforms. Some ExpressRoute Direct connections will support a split view for Tx light levels by lane. However, this is not supported on all deployments.
+>
+
 ## ExpressRoute Virtual Network Gateway Metrics
 
 Aggregation type: *Avg*