Previously, the atl.footer location was working for both databases and whiteboards, which was awesome, it meant that my app automatically worked with these new features.
Sometime in the recent past, the atl.footer extension point was removed from both databases and whiteboards, which means that my app which previously worked with these new features, is now broken.
This is beyond disappointing as there was no notice of a deprecation period and certainly no RFC to consult on how apps would be affected by this breaking change.
Hmm, this is no good Our team is looking into this for you now and is a priority for us to investigate. I have also sent you an email so I can connect you with the investigating team if we need to get more information.
I am told that we have a solution that Confluence are preparing to release soon. It is likely that atl.footer will render invisibly so it will allow background scripts to function on those content types. I will have more details and an ETA shortly.