Reliability is not just about uptime; it's about meeting user expectations. If your system quickly returns errors, users won't be satisfied. Therefore, user happiness should be at the core of reliability considerations.
A Service Level Indicator (SLI) is a quantifiable measure of service reliability, reflecting how well the service is performing in a specific aspect, such as latency. This metric should closely correlate with user satisfaction.
Service Level Objectives (SLOs) set target values for SLIs, creating clear performance goals that directly relate to user expectations and overall service quality, bridging the gap between business needs and technical excellence.
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