For me it looks like that:
addons.cfg contains (stripped from comments):
persistence = rrd4j, mapdb
Immidiate candidates are mqtt1 binding and action!
Removed that file and restarted.
It looks as if the system is really “cooling down”! I’d call that solved!
I did do the update of my openhabian system by the automated update with openhabian-config, the fact that the mqtt binding and action remained in the system migth be true for installations!!!