The purpose of port 8080 for IngressGateway-NodeAgent

Istio Version: 1.3.0

Hello, 8080 is a common port for tomcat. However, the nodeAgent of ingressGateway listen it in the pod.
The port conflicts when creating an external publication of 8080.

The purpose of port 8080 for IngressGateway-NodeAgent is to debug the nodeAgent. Is there any other purpose?

If I change this port with the environment “DEBUG_PORT”, would it have any effect?