public static EmptyEndpointGroupException get() {
        return Flags.verboseExceptionSampler().isSampled(EmptyEndpointGroupException.class) ?
               new EmptyEndpointGroupException() : INSTANCE;
    }
Returns an {@link EmptyEndpointGroupException} which may be a singleton or a new instance, depending on
{@link Flags#verboseExceptionSampler()}'s decision.
core/src/main/java/com/linecorp/armeria/client/endpoint/EmptyEndpointGroupException.java