Kubernetes itself is capable of (server side) service discovery (see: https://kubernetes.io/docs/concepts/services-networking/service/#discovering-services). Using native kubernetes service discovery ensures compatibility with additional tooling, like: istio https://istio.io (service mesh, capable of load balancing, ribbon, circuit breaker, failover and much more).
The caller service just needs to refer to names resolvable in particular kubernetes cluster then. Simplest implementation might use the spring
RestTemplate referring to fully qualified domain name (FQDN)
Additionally, hystrix can be used for:
@HystrixCommand(fallbackMethod=does the job.