If installing via CLI, users are informed that app is using an EOL runtime.
$ flatpak install com.obsproject.Studio/x86_64/stable
Required runtime for com.obsproject.Studio/x86_64/stable (runtime/org.kde.Platform/x86_64/6.6) found in remote flathub
Do you want to install it? [Y/n]:
Info: runtime org.kde.Platform branch 6.6 is end-of-life, with reason:
We strongly recommend moving to the latest stable version of the Platform and SDK
Info: applications using this runtime:
com.obsproject.Studio
[...]
The same when running any flatpak update command:
$ flatpak update
Looking for updates…
Info: runtime org.kde.Platform branch 6.6 is end-of-life, with reason:
We strongly recommend moving to the latest stable version of the Platform and SDK
Info: applications using this runtime:
com.obsproject.Studio
Nothing to do.
Not so sure when using GNOME Software or KDE Discover.
EDIT: GNOME Software is showing this banner when accessing the app in the store:
