When batch worker nodes run out of memory, a process that  kills the biggest or most rapidly growing process is initiated. This happens in order to protect the worker node.

In such a case, the owner of the process is being notified by e-mail. On some batch nodes the offending process did not exit. This resulted in the user being notified over and over again.

The hosts affected have been identified and paused, the issue is under investigation.

They will be made available again as soon as the root issue is fixed.