We're switching from Ribbon to Spring Cloud Load Balancer, and thus far things seem to work. However I want to be able to see which instance is chosen on each request to verify the behavior.
Is there a debug flag or some other way to see which instance SCLB is choosing on each request?
The selected service instances are logged for debug in various places on the client side, for example in ReactorLoadBalancerExchangeFilterFunction, in RetryLoadBalancerInterceptor, in RetryableLoadBalancerExchangeFilterFunction, etc. Also,for WebClient-backed load-balancing you can enable setting instance Id as a cookie. You can also enable Micrometer support, which will register various useful metrics, including instance ids. Additionally, you can implement your own logging mechanism using the LoadBalancerLifecycle callbacks.
