@Nullable
    @Override
    protected List<Endpoint> latestValue() {
        final List<Endpoint> endpoints = state.endpoints();
        if (endpoints == UNINITIALIZED_ENDPOINTS) {
            return null;
        } else {
            return endpoints;
        }
    }
Creates a {@link XdsEndpointGroup} based on the specified {@link ClusterSnapshot}.
This may be useful if one would like to create an {@link EndpointGroup} based on
a {@link GrpcService}.
xds/src/main/java/com/linecorp/armeria/xds/client/endpoint/XdsEndpointGroup.java