public CompletableFuture<List<Endpoint>> healthyEndpoints(String serviceName) {
        return healthyEndpoints(serviceName, null, null);
    }
Retrieves the list of healthy endpoints for the specified service name from the Consul agent.

@param serviceName the name of the service whose healthy endpoints are to be retrieved

@return a {@link CompletableFuture} which provides a list of healthy {@link Endpoint}s
consul/src/main/java/com/linecorp/armeria/internal/consul/ConsulClient.java