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Azure Application Gateway Metrics

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description Azure Application Gateway Metrics Overview

Monitoring the metrics from Application Gateway is vital for understanding the health and performance of your ingress layer. Key metrics include HTTP response codes (4xx/5xx rates), latency at the edge, and WAF rule hits. This helps determine if traffic issues are due to backend service failure or network/security misconfiguration.

help Azure Application Gateway Metrics FAQ

Which Azure Application Gateway metrics should I monitor first?

Start with throughput, failed requests, response status counts, latency, and backend health. For a Web Application Firewall deployment, also watch blocked requests and rule-match activity because these can reveal attacks or false positives.

What do 4xx and 5xx responses indicate on Application Gateway?

4xx responses usually point to client-side or routing-related problems such as unauthorized or missing requests, while 5xx responses often indicate gateway or backend failures. The metric alone does not identify the cause, so correlate it with backend health and access logs.

How can Application Gateway metrics reveal a slow website?

Latency metrics can show whether delay is occurring at the gateway edge or in the backend service. Comparing gateway latency with backend response time helps separate an overloaded application from an ingress or network problem.

Why should I monitor WAF rule hits on Azure Application Gateway?

WAF rule hits show which requests are being inspected or blocked by the firewall. A sudden rise can mean an attack, a new traffic pattern, or a false positive that prevents legitimate users from reaching the application.

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