Cloud Digital Leader Scaling with Google Cloud operations Practice Question
An operations team tracks the following metrics for their customer portal: request latency p99, error rate, and requests per second. In Site Reliability Engineering terminology, what are these metrics called, and what do they collectively define?
⚠ Common exam trap
Many candidates confuse SLIs with SLAs or KPIs, not realizing that SLIs are the raw measurements that feed into SLOs, which then underpin SLAs, and that they are specifically defined from the user's perspective to quantify reliability.
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
✓
Service Level Indicators (SLIs), which measure specific dimensions of service behavior from the user's perspective and collectively define how reliability is quantified
In Site Reliability Engineering (SRE), the metrics p99 latency, error rate, and requests per second are classified as Service Level Indicators (SLIs). SLIs are carefully chosen quantitative measures of specific aspects of the service's behavior, such as availability, latency, or throughput, as experienced by the end user. Collectively, these SLIs define how reliability is quantified and are used to set and monitor Service Level Objectives (SLOs).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Key Performance Indicators (KPIs) that define the overall health of the business
Why it's wrong here
KPIs is a general business term. In SRE, these specific technical metrics measuring service health from the user's perspective are specifically called Service Level Indicators — a more precise term with defined meaning in the SRE framework.
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Service Level Agreements (SLAs), defining the contractual commitments made to customers
Why it's wrong here
SLAs are contracts with customers that define consequences when service falls below standards. The metrics themselves — latency p99, error rate, throughput — are SLIs, not SLAs. SLAs reference SLIs but are a distinct concept.
- ✓
Service Level Indicators (SLIs), which measure specific dimensions of service behavior from the user's perspective and collectively define how reliability is quantified
Why this is correct
SLIs are the specific measurable quantities that capture how users experience the service. Latency (is it fast enough?), error rate (is it working?), and throughput (is it keeping up?) are the canonical SLI types. Together they provide a quantitative picture of reliability that can be used to set SLO targets.
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Operational metrics that are only relevant to the infrastructure team and not to business stakeholders
Why it's wrong here
This view mischaracterizes SLIs such as latency, error rate, and throughput as purely internal telemetry. In fact, these metrics quantify the user's lived experience with the service, making them direct drivers of customer satisfaction, trust, and revenue. When SLIs are formalized into SLOs, they become business-aligned targets that engineering and product leadership jointly own, not infrastructure-only concerns. Treating reliability metrics as irrelevant to business stakeholders ignores that degraded error rates and latency are among the fastest paths to customer churn and brand damage.
Go deeper
Related to this question
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Traditional IT vs Cloud Operations Model
Key term
Reliability
Reliability is the measure of a system's ability to consistently perform its intended functions without failure over a specified period of time under stated conditions.
Key term
Availability
Availability is the measure of how often a system or service is operational and accessible when needed, typically expressed as a percentage of uptime.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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