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Timing failures are usually quiet, and nothing inside a wrong clock knows it is wrong. The only detector is a second clock — and the boundary between what the two share and where they are independent decides what you can learn by comparing them.
A blackout killed my Internet in fourteen minutes. I wired up a car battery, found both ISPs were fine, restored the gateway — and still could not get online
Finding out when something goes wrong with Proxmox
Installing the Checkmk RAW agent on Proxmox VE and Backup Server, with the smart plugin for NVMe health
Considerations for Clock Sync Daemons and Proxmox