the.com/outage duration
the metric that turns your 'five nines' promise into a public confession.
means the total time a system stays broken, measured from first failure to full recovery, not just detection.
from emerged from telecom and power-grid reliability engineering, where uptime was gospel and every dark minute had to be logged, explained, and paid for.
clock starts earlyreal duration includes detection lag, not just the fix
nines math99.999% uptime allows just 5 minutes a year
mttr vs mtbfduration measures recovery speed, not failure frequency
sla penaltiescloud contracts often pay refunds by the minute