Since the predefined dashboards on Grafana.com need to be converted before use, the Get Started / Predefined Dashboards section of the docs should either specify how to find (as of yet non-existent) updated versions of those dashboards or direct the user to the conversion documentation to convert the dashboard JSON prior to import, as those doing fresh installs rather than an upgrade from v8 to v9 will likely miss those conversion instructions since they are part of the Upgrade instructions and not part of the general installation documentation.