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ISTQB Certified Tester: Performance Testing (CT-PT) · ISTQB
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- An SLO (Service Level Objective) is an internal target for a Service Level Indicator (SLI) — for example, 'p99 < 200 ms over 30 days'. SLAs are external contracts (often less strict than SLOs). Error budgets quantify how much SLO breach is acceptable before halting feature work.