I wonder why they couldn't do that at OVH. The data centres are always manned and they had 8 minutes on batteries. Why didn't they detect after 20 seconds that

I wonder why they couldn't do that at OVH. The data centres are always manned and they had 8 minutes on batteries. Why didn't they detect after 20 seconds that generators don't start despite power failure and triggered a manual failover? Sounds like something the staff should be able to do?