Do we consider loadbalancer configuration on topic? Though they certainly do things on layer 2/3, a lot of the things they do is on higher layers as well. At the company I work for loadbalancers are managed by NOC engineers, but I know other companies where loadbalancers are managed by systems engineers, so I'm curious what others thing about this.
Short Answer: A question about a load-balancer, that is involved in balancing traffic at the network layer (layer 4 or below) is directly involved with end to end visibility of network traffic, so by that measure, I believe it to be on topic.
I think if you are asking about how to set up a stateful load-balancer, synchronising TCP state tables between them for example, that would be OK. This is a networking question. I don't think asking about setting up a HTTP load balancer would be acceptable though (that is probably more for ServerFault's realm). That example is aimed at the application layer if you like (viewing this from a typical OSI 7 layer model view). Although I do think layer 7 can be on topic, perhaps not in this case.
Responsibility for load balancers often fall to the network folks and without proper consideration of the network there will be issues. Even if they are talking about a HTTP load balancer, in my mind this makes them on topic for network engineering along with other devices that operate above L4, such as traffic shaping/policing.