This is what you want to see on your Linux router/load balancers' ethtool output.
But are you running Netflow + Akvorado on it so you can see where the traffic goes 😛
Fortunately, it's a very simple HTTP load balancer for just a couple of in-house services. So observability is much easier than a generic router with a complicated mix of customers/services behind it, like at an ISP.