I had an issue in which clock drift between the OMS and OMR caused the OMS to fail to start. Full details are here.
My recommendations for the DBA bookshelf at work is:
Upgrading Oracle Enterprise Manager Cloud Control 220.127.116.11 with Bundle Patch 1 to 18.104.22.168 (aka Release 2?).
I have struck a few problems so far.
Have a problem in starting Oracle Cloud Control 12c on GRIDCTRL.
Had a little drama after I moved the
YAOCM.ID.AU network to a new subnet.