Hi,
TL;DR: If “Angelsberg” does not ring a bell, you're not affected :-)
Otherwise, you probably run machinery against request logs that cares about filtering requests made by WMF monitoring infrastructure. Just a heads up that it seems at
https://gerrit.wikimedia.org/r/#/c/182558/
a discussion is starting on how to detect such monitoring requests and how they might change.
Chime in there, or at least watch it's outcome to make sure your scripts keep on detecting/filtering monitoring requests.
Have fun, Christian