Application Gateway currently has seven metrics to view performance counters. Metrics are a feature for certain Azure resources where you can view performance counters in the portal. For Application Gateway, the following metrics are available: Total Requests Failed Requests Current Connections Healthy Host Count Response Status Throughput Unhealthy Host count You can filter on a per backend pool basis to show healthy/unhealthy hosts in a specific backend pool References: https://docs.microsoft.com/en-us/azure/application-gateway/application- gatewaydiagnostics#Metrics