Turns out the PDU was ok, but the breaker was very hot, we moved over to spare and calling in the electrician for checking the other in the morning, it was running all within spec at 80% so it should not have tripped even even there was a spinup of HD for a burst.
OH we checked and got all the VMs up some minutes from the last post, this issue is closed as of now. But the now old circuit will be checked out in the morning once businesses reopen.