I am seing that the resources in the KnowledgeBase are being deleted without aparent reason.
I have some URL resources configured to get it from guvnor using the basic auth.
It seems this method,
is not including auth parameters to get the last modified date from the resource url. This is causing (in my environment), to get last modified date as 0, and this makes the ResourceChangeScanner to remove the resource from the kbase. I made the fix and seems to work fine in my machine.