Hello,
Upon restart the server that is self-hosting our Confluence instance, we noticed our confluence service never came back up. Instead it was routed to the "setup confluence page" as if we were installing from scratch. The specific URL is below.
http://localhost:8090/setup/setupstart.action
Currently this is running on ubuntu 16.04.
The only mistake we can possibly think of is removing a log file from the /var/atlassian/confluence directory. This was done by mistake, and we are paying for it now.
We were originally working on it for completely different reason ( hibernate error.)
Please let me know any information you need so I can better help you. We have a backup but its a bit older than I would like. Any ideas?