@UnstableApi
    static EndpointSelectionStrategy rampingUp() {
        return WeightRampingUpStrategy.INSTANCE;
    }
Returns a weight ramping up {@link EndpointSelectionStrategy} which ramps the weight of newly added
{@link Endpoint}s using {@link WeightTransition#linear()}. The {@link Endpoint} is selected
using weighted random distribution.
The weights of {@link Endpoint}s are ramped up by 10 percent every 2 seconds up to 100 percent
by default. If you want to customize the parameters, use {@link #builderForRampingUp()}.
core/src/main/java/com/linecorp/armeria/client/endpoint/EndpointSelectionStrategy.java