Without being authenticated, accessing /monitoring redirects to /userlogin!default.action?os_destination=/monitoring which shows a blank page instead of a login page in Bamboo 7.

This is because, when not authenticated, the redirect URL should be /userlogin!doDefault.action?os_destination=/monitoring (according to login.url in the seraph-config.xml file)
The new URL works since Bamboo 6 and the old URL does not work anymore in Bamboo 7.

A workaround to the issue is to log in before accessing the /monitoring URL.