In my Opinian there should be a requirement for a Release notes to get listed in Nextcloud Apps. But I would also agree with a optional release notes button if an update is available and the Update delivers a Release notes.

cc @nextcloud/designers for a nice way to integrate this
Yeah, could be done via a popover / tooltip on hovering the update button. Should show below it thought, not to the side.
@jancborchardt i don't think a hover / popover is very useful for a changelog that could be quiet large with upgrade and compatibility infos, etc.
I would like to see a separate/explicit button that opens the changelog (maybe a link to the github page/Changelog.md of the app, etc.)
This should be in the sidebar related to the app, see https://github.com/nextcloud/server/issues/2138 for that.
This should be in the sidebar related to the app, see #2138 for that.
I added it there - let's close this here and continue the discussion there.
Could someone please re-open this? It's still necessary to go to the App Store to see the changes.

@klawdhfzasjhaa https://github.com/nextcloud/server/issues/9165
It's a pity, that this useful thing is waiting to be implemented for so long...