public SELF selectionStrategy(EndpointSelectionStrategy selectionStrategy) {
        this.selectionStrategy = requireNonNull(selectionStrategy, "selectionStrategy");
        return self();
    }
Sets the {@link EndpointSelectionStrategy} that determines the enumeration order of {@link Endpoint}s.
core/src/main/java/com/linecorp/armeria/client/endpoint/dns/DnsEndpointGroupBuilder.java