SLA
Abbreviation · Development
Definitions
Service Level Agreement — a formal commitment defining the expected level of service (usually uptime). 99.9% sounds great until you realize it allows 8.7 hours of downtime per year. 99.99% allows 52 minutes.
In plain English: A promise about how reliable a service will be — usually expressed as a percentage of uptime, like 99.9% means less than 9 hours of downtime per year.