Availability
The ability of a system to provide service normally when needed, typically measured as a proportion of uptime. It is one of the key metrics in enterprise application selection.
Timeline (last 90 days)
A cheap endpoint that returns 503 under high load has an effectively infinite actual cost for failed requests.
99.9% availability corresponds to approximately 8.7 hours of downtime per year, and 99.99% corresponds to approximately 52 minutes.
Measuring the reliability of critical systems typically uses the Availability metric; five nines (99.999%) means total annual downtime does not exceed approximately 5 minutes.
All Facts (3)
A cheap endpoint that returns 503 under high load has an effectively infinite actual cost for failed requests.
50%Unverified99.9% availability corresponds to approximately 8.7 hours of downtime per year, and 99.99% corresponds to approximately 52 minutes.
50%UnverifiedMeasuring the reliability of critical systems typically uses the Availability metric; five nines (99.999%) means total annual downtime does not exceed approximately 5 minutes.
50%