Standalone dashboard without login.

[obermeier]

Discussed in #1832

^{Originally posted by obermeier August 17, 2023}
If a dashboard was created, it has the possibility to set the permissions to "Public Element"

With this permission it is possible to access the dashboard without login, e.g. with the standalone link (/standalone/sp:dashboardmodel:...)

But the data are not shown because the measurement API requires an authentication. (/streampipes-backend/api/v4/datalake/measurements/)

One of my questions is: wath should be the meaning of "Public Element".
- Accessible for all users of the system, or also users without an account.

I like the idea to have the possibility to provide dashboards without an account.