@Override
    default void removeListener(Consumer<?> listener) {}
Adds a {@link Consumer} that will be invoked when this {@link EndpointGroup} changes its value.
If {@code notifyLatestEndpoints} is set to true and the {@link #whenReady()} is completed already,
the {@link Consumer} will be invoked immediately with the current {@link #endpoints()}.
core/src/main/java/com/linecorp/armeria/client/endpoint/EndpointGroup.java