Loadbalancer - allow custom instance alive checker #763
Description
HealthCheckServiceInstanceListSupplier is currently using WebClient for checking if ServiceInstance is alive. In my project I'm not using webflux for anything so to use health check I should add spring-boot-starter-webflux only for that.
I know that RestTemplate should not probably be supported here because of announced moving from RestTemplate to WebClient, but could you consider something like additional constructor for HealthCheckServiceInstanceListSupplier with for e.g. Function<ServiceInstance, Mono<Boolean>> aliveChecker? With this additional constructor (or some better way, with WebClient optional) someone could implement that function with RestTemplate or implement some additional checks if needed.