Expert knowledge for Azure Application Gateway development including troubleshooting, best practices, decision making, limits & quotas, security, configuration, integrations & coding patterns, and deployment. Use when configuring listeners/routing, WAF/TLS, AGIC/AKS integration, autoscale/zone redundancy, or v1→v2 migration, and other Azure Application Gateway related development tasks. Not for Azure Front Door (use azure-front-door), Azure Load Balancer (use azure-load-balancer), Azure Traffic Manager (use azure-traffic-manager), Azure Firewall (use azure-firewall).