Tracing Sampling configuration ambiguity

As per the jaeger tracing documentation of traefik, we have samplingServerUrl, samplingType and samplingParam settings (and few others).

When I set samplingServerURL, I am expecting that traefik will make a remote call to this URL and get sampling strategy, and use that for sampling traces. In that case, it will simply ignore the samplingType and samplingParam values (as sampling is not being fetched from central configuration - not from traefik configuration toml file). Is this understanding correct.

If not, please help me understand how these 3 settings work together (sampling url, type and param). If its correct, I think it should say so in the documentation where it is mentioned that all these 3 are required ideally it should be either url or (type and param).