A · Define goodBeginner35 min read
2. SLIs, SLOs & user perception
Performance Testing Basics · 36 pages source format
SLI = what you measure. SLO = target. Latency percentiles (p95/p99) beat averages. Errors and saturation complete the picture.
What you'll learn
- Latency percentiles
- Availability
- Apdex lite
Define SLIs
For your journey: success rate, latency p95, maybe throughput.
- Latency — p50/p95/p99
- Errors — 5xx / business failures
- Saturation — CPU, pool, queue depth
Do this now
Write SLIs + draft SLO (e.g. p95 < 500ms at X RPS). Note confidence.
Clear?