private List<EquivalentAddressGroup> toTargets(final List<ServiceInstance> newInstanceList) {
            final List<EquivalentAddressGroup> targets = Lists.newArrayList();
            for (final ServiceInstance instance : newInstanceList) {
                targets.add(toTarget(instance));
            }
            return targets;
        }
Do the actual update checks and resolving logic.

@return The new service instance list that is used to connect to the gRPC server or null if the old ones
        should be used.
grpc-client-spring-boot-starter/src/main/java/net/devh/boot/grpc/client/nameresolver/DiscoveryClientNameResolver.java