KCNA Cloud Native Observability Practice Question
Which of the following is the correct definition of a Service Level Indicator (SLI)?
⚠ Common exam trap
KCNA often tests confusion between SLI, SLO, and SLA, tricking candidates into selecting the SLO definition (target value) when the question asks for the SLI (the measurement itself).
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A quantitative measure of a specific aspect of the service's reliability
An SLI is a quantitative measure of a specific aspect of a service's reliability — for example, request latency, error rate, or availability — expressed as a ratio of good events to total events. It is the raw measurement that feeds into SLOs and error budgets, not a contract or a target.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A formal contract between a service provider and a customer
Why it's wrong here
A formal contract between provider and customer describes an SLA, which specifies commitments and consequences for missing them. An SLI is the underlying measurement, such as latency percentiles, that feeds those commitments. This option would be correct if the question asked what document defines contractual service guarantees.
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A target value or range for a metric, agreed upon with stakeholders
Why it's wrong here
A target value or range agreed with stakeholders defines an SLO, the objective set against an indicator, not the indicator itself. An SLI is the measured metric, such as the proportion of successful requests. This option would be correct if the question asked for the definition of a Service Level Objective.
- ✓
A quantitative measure of a specific aspect of the service's reliability
Why this is correct
An SLI is the quantitative measurement itself — for example request latency or error rate — expressed as a number, which is then compared against an SLO target. It measures a specific reliability aspect of the service rather than defining a threshold or agreement.
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A tool for aggregating logs from multiple sources
Why it's wrong here
Log aggregation is performed by tooling such as Fluentd, Loki or CloudWatch Logs, which collect and index records; an SLI is a quantitative measure of service behaviour, like request latency or error ratio. Log pipelines would be the correct answer if the question asked how to centralise telemetry from multiple sources.
About these practice questions
This KCNA question is part of Courseiva's 930-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official CNCF exam blueprint
This KCNA practice question is part of Courseiva's free CNCF certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the KCNA exam.