@VisibleForTesting
    @Nullable
    ScheduledFuture<?> scheduledFuture() {
        return scheduledFuture;
    }
Returns a new {@link EurekaEndpointGroupBuilder} created with the specified {@link HttpPreprocessor}
and path.
eureka/src/main/java/com/linecorp/armeria/client/eureka/EurekaEndpointGroup.java