I have a k8s service defined as type: LoadBalancer which sets an external LB. Can I identify on application level that an incoming request is routed from the LoadBlancer?
Are there any guaranteed http headers? Can I define custom headers for that service that would be added to all incoming requests?
ELB guide says that:
Application Load Balancers and Classic Load Balancers add X-Forwarded-For, X-Forwarded-Proto, and X-Forwarded-Port headers to the request.
Have you already been trying using these ones?
If your internal ingress is using nginx as an ingress controller you can add a custom header that will indicate that.