I can only speak for Austria (see above). These Vienna Convention shared use paths signposted with the blue rounds in our local traffic code are filed under cycling infrastructure, see litera 11b. Funnily, the top picture in Wikipedia article on cycling infrastructure shows just the same sign.
I proposed to change the ordering on the global documentation for highway=path to show actual pictures of paths, not just traffic signs on top of its “examples” section. Here to the topic.
Openstreetmap can beat those bureaucrats any time!