I solved the riddle. And the problematic part is/was Z-Ways Cloud-Backup application. Thinking about what apps are using cron, the scales fell of my eyes: I could remember that I activated the CloudBackup app in one of the 2.3.0 RCs and I think I set it to 3am (maybe not the best idea: RC version and beta-state app.)
Checking back in the app it shows me just the name field. This seems not to be intended, because the apps module.json looks like it should show a lot more options. This is what I get:
So I kicked out the CloudBackup app and today in the morning everything was just fine.
For the record: the most easy way checking what apps are using cron, seems to check out the instances API call:
Code: Select all