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Summary
Azure Resource Health helps you monitor Azure Application Gateway resource health and quickly diagnose service problems that affect your gateways. This article explains the available health statuses, how gateway health is assessed, and how this information supports troubleshooting and recovery.
For Application Gateway, Resource Health relies on signals emitted by the gateway to assess whether it's healthy or not. If the gateway is unhealthy, Resource Health analyzes additional information to determine the source of the problem. It also identifies actions that Microsoft is taking or what you can do to fix the problem.
For additional details on how health is assessed, review the full list of resource types and health checks in Azure Resource Health.
Health status
The health status for Application Gateway is displayed as one of the following statuses.
Available
An Available status means the service hasn't detected any events that affect the health of the resource. You'll see the Recently resolved notification in cases where the gateway has recovered from unplanned downtime during the last 24 hours.
Unavailable
An Unavailable status means the service has detected an ongoing platform or non-platform event that affects the health of the gateway.
Platform events
Multiple components of the Azure infrastructure trigger platform events. They include both scheduled actions, such as planned maintenance, and unexpected incidents, such as an unplanned host reboot.
Resource Health provides more details on the event and the recovery process. It also enables you to contact support even if you don't have an active Microsoft support agreement.
Unknown
The Unknown health status indicates Resource Health didn't receive information about the gateway for more than 10 minutes. This status isn't a definitive indication of the state of the gateway, but it's an important data point in the troubleshooting process.
If the gateway is running as expected, the status changes to Available after a few minutes.
If you're experiencing problems, the Unknown health status might suggest that an event in the platform is affecting the gateway.
Degraded
The Degraded health status indicates your gateway detected a loss in performance but is still available for usage.
References
To learn about troubleshooting Application Gateway Web Application Firewall (WAF), see Troubleshoot Web Application Firewall (WAF) for Azure Application Gateway.