9% ? /s (though To be honest I genuinely wouldn't be surprised if things go down so bad too at this point either)
Unironically, I think 9% uptime would be "one-tenth of a nine".
90% would be one 9 following the sequence back.
99.99
99.90
99.00
90.00
Unironically, I think 9% uptime would be "one-tenth of a nine".