Reboot/System boot usually means it's shut down
Either it was manually shut down (hard boot/shutdown) or some sort of APC. Since (at last check) Nocster doesn't supply APC's, then most likely it was manually shutdown/restarted.
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Perhaps someone in your DC needed to physically relocate your server, and shut it down/restarted it accordingly. Perhaps check with your DC? They should have a log of this.
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If the server was powered off then it is a little rough for anything to be written to wtmp. It was likely as mentioned moved and you are seeing the reboot from sending a ctl+alt+del from a keyboard locally. The best advice given above is to contact your DC and ask.
Actually, the most common occurence for this would probably be due to the server showing up in our system monitor. If we monitor ping/http for you, and they stop responding, our SOP is to give the server a 3-finger salute to restore service.
If you notice this, feel free to open a ticket and we will see what we can tell you.
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