@UnstableApi
    static WeightRampingUpStrategyBuilder builderForRampingUp() {
        return new WeightRampingUpStrategyBuilder();
    }
Returns a new {@link WeightRampingUpStrategyBuilder} that builds
a weight ramping up {@link EndpointSelectionStrategy} which ramps the weight of newly added
{@link Endpoint}s. The {@link Endpoint} is selected using weighted random distribution.
core/src/main/java/com/linecorp/armeria/client/endpoint/EndpointSelectionStrategy.java