Finally happened the thing which I expected to happen since I left to Japan. My server (currently being few thousands kilometers away) crashed and exactly followed Murphy's law to break in time when it would caused largest possible downtime. Anyway it's now back and I hope all services are correctly running.
And no, I have no idea what caused power led to blink and make the computer unresponsive for anything except plugging it out of power and then pugging it back. Hopefully it will not repeat, at least not until I'll be back in Prague :-).
