We have now successfully resolved the issue on our side.
The following measures helped:
- Changing the Proxmox CPU type to x86-64-v2-AES (available since Proxmox version 8). We implemented this change yesterday morning, which roughly halved the load (see graphs).
- Disabling the “Symmetric encryption” rule. This encryption has already been active by default with agent registration since CMK Agent version 2.2. After disabling it, the load is now even lower than before the upgrade to 2.3. We made this change today (see graphs).
Hopefully, our solution helps others facing similar issues. Good luck!
