static EndpointSelectionStrategy roundRobin() {
        return RoundRobinStrategy.INSTANCE;
    }
Returns a round-robin strategy, which ignores {@link Endpoint#weight()}.

@see #weightedRoundRobin()
@see #sticky(ToLongFunction)
core/src/main/java/com/linecorp/armeria/client/endpoint/EndpointSelectionStrategy.java