Check appserver.log (default location : C:\Program Files\BMC Software\BladeLogic\NSH\br) .
You should see message like below if servers were decommissioned:
DBKey:SComponentModelKeyImpl:2000241-1-2019100 marked 0 Psis as deleted
Decommissioned server with id 2000100
Also, perhaps worth ruling out the obvious... Have you switched roles to one which doesn't have visibility of the servers?
Absolutely worth ruling out, but no, this is not the case.
I will look for the appserver.log and see if there are any clues there.
Thanks for helping.
Thank you, our system is on UNIX so the appserver.log is located in /opt/bmc/BladeLogic/8.0/NSH/br/
And found the entry, the missing servers were mistakenly decommissioned.
All sorted now.
thanks for confirmation !!