Availability - CI/CD Glossary Definition
Availability is the proportion of time a system is operational and able to serve requests, commonly stated as a percentage such as 99.9 percent ("three nines").
What the nines mean
99.9 percent allows about 8.76 hours of downtime per year; 99.99 percent allows about 52.6 minutes. Each extra nine reduces the allowed downtime roughly tenfold.
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