Update load-balancer-custom-probe-overview.md

Author: mahipdeora

articles/load-balancer/load-balancer-custom-probe-overview.md

@@ -100,6 +100,8 @@ For HTTP/S probes, if the configured interval is longer than the above timeout p
 
 * To test a health probe failure or mark down an individual instance, use a [network security group](../virtual-network/network-security-groups-overview.md) to explicitly block the health probe. Create an NSG rule to block the destination port or [source IP](#probe-source-ip-address) to simulate the failure of a probe.
 
+* Unlike load balancing rules, inbound NAT rules do not need a health probe attached to it. 
+
 ## Monitoring
 
 [Standard Load Balancer](./load-balancer-overview.md) exposes per endpoint and backend endpoint health probe status through [Azure Monitor](./monitor-load-balancer.md). Other Azure services or partner applications can consume these metrics. Azure Monitor logs aren't supported for Basic Load Balancer.