I know this case, but this is not my problem for the moment.
We run OLB every 4 hours since we have to restore the database after a crash.
After the OLB restarts the secondary SS and during it's model activation process it generates many events with precedence 20.
I'm not really sure, if this is new. That's why I asked my question.
With 9.4.2 this events are very noticeable because of the yellow color and now I get some discussions with my users about it.
Maybe this will lead to further questions, but I don't know yet.