Have an issue with one of my customer Proxmox cluster with error below related to RRDC update error
This is caused by drifting time on the host. Somehow the time use hwclock with wrong date.
To resolve the issue, need to update the time, the simplest way is sync with ntp using timedatectl.
Then delete /var/lib/rrdcached/db and restart rrdcache.service.