We're trying to weed out users who never/rarely use Jira. Looking through the user list's column for "last login" it becomes clear that hardly anyone have been dormant for more than a week. This became especially clear when we discovered a user that should have been deleted due to stopping with the company, but hadn't, and it appeared he'd logged in months after his last day in office.
Probing the log files, it became evident that these logins came from our linked Confluence server.
What could cause this?