Good news admins....
... you have new work :) The best way that we hear and solve your update problem is to update to OBS 2.6 Beta 1 right now (you may use a test system).
OBS 2.6 Beta is available as version 2.5.90 inside of OBS:Server:2.6 project. You can find appliances and package repositories here:
SLE_12 needs one more fix to be available.
You can find the temporary release and update notes here:
We will improved it a bit more before the release.