Hi !
TL ; DR : This link is broken : https://yunohost.org/oc/packaging_apps_levels
Here in the admin guide, at the bottom of the page, there is a paragraph about integration and quality levels. (The paragraph itself is a little outdated, since it describe a scale from 0 to 8, but I think it now goes to 10, but it’s just a detail.) To explain the different levels, it link to a page that, if I remember correctly, once existed, but now just 404.
It is a shame since I found it very useful to understand more or less the choice I make when I install an app with a given level. I would love to see this page back !
Much love to everyone working on this project 