public SELF executor(EventExecutor executor) {
        this.executor = requireNonNull(executor, "executor");
        return self();
    }
Sets the {@link EventExecutor} to use to execute tasks for computing new weights. An {@link EventLoop}
from {@link CommonPools#workerGroup()} is used by default.
core/src/main/java/com/linecorp/armeria/common/loadbalancer/AbstractRampingUpLoadBalancerBuilder.java