If the entire planet Earth (and all servers on it) were swallowed by a black hole, tolerance of that fault would require web hosting in space — good luck getting that budget item approved. So it only makes sense to talk about tolerating certain types of faults.
The servers dont care. The user requests will plummet to zero.
In fact, aside from the minor issue of the servers being compacted into a singularity, everything would be great -- no failed requests!
Good luck getting the performance metrics outside of the singularity though.

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Brian