Generally Available: Application Gateway adds MaxSurge support for zero-capacity-impact upgrades

Azure Application Gateway now supports MaxSurge, enabling new instances to be provisioned during rolling upgrades without taking existing ones offline. This allows customers to transition to newer gateway versions without any capacity degradation, ensuring: * Full traffic handling throughout the upgrade * Minimized deployment risk This enhancement offers greater resiliency and reliability for mission-critical applications, especially those requiring consistent performance during infrastructure updates. [Learn more](https://learn.microsoft.com/en-us/azure/application-gateway/application-gateway-faq#maintenance).