Yes, aside from multiple load balancing policies, Caddy 2 has a circuit breaker that will automatically adjust the load balancing before latency to a particular

Yes, aside from multiple load balancing policies, Caddy 2 has a circuit breaker that will automatically adjust the load balancing before latency to a particular backend begins to grow out of tolerances. Both the load balancing policies and the circuit breakers are extensible, meaning it is easy to change their behavior and add new ones as needed. I could also imagine a specific load balancing policy that adds up a cost for each request using headers such as transfer size; i.e. dynamic weights. This would be a great contribution to the project if you are interested! Caddy 2 also has an embedded scripting language that can make this kind of logic scriptable and dynamic, but that's still a WIP.