Google SRE Concept Measuring System Performance
Within Google’s Site Reliability Engineering framework, which concept measures how well a system is performing?
Community Votes
100% of anonymous learners picked answer B. Votes are pick records left by other test-takers — they are not the verified answer.
Community Insight
Tests the distinction between SLI (measurement), SLO (target), and SLA (contract). The common trap is confusing the metric itself with the goal or agreement.
Identifies the correct Google SRE concept for measuring system performance. Establishes that Service-level Indicators (SLIs) are the quantitative metrics used to track reliability and health.
Learners often select 'Service-level objective' because it sounds like a performance target, but an objective is a specific value, not the measurement mechanism.
Community Discussion (3 comments)
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Expert Analysis
Why the Answer Is Correct
The correct answer is B. In Google's Site Reliability Engineering (SRE) framework, a Service-level Indicator (SLI) is defined as a carefully measured aspect of service. It is a quantitative measure that reflects the performance, reliability, and overall health of a system, such as latency, traffic, errors, or saturation.Why the Other Options Are Wrong
Option A, Service-level agreement (SLA), is a business contract outlining expected performance, not the technical measurement itself. Option D, Service-level objective (SLO), is a target value for the SLI (e.g., 99.9% uptime), representing the goal rather than the act of measuring. Option C, Error reporting, is a general practice but not the specific SRE term for the metric definition.Community Comment Notes
Community consensus strongly supports Option B. As user Vivek007 noted, "SLI is a carefully defined quantitative measure... Most often, an SLI is a metric or combination of metrics that directly reflect the performance." Another commenter confirmed that SLIs are used to objectively measure system health.Official Reference
Exam Strategy
Memorize the hierarchy: SLI is the data point, SLO is the target, and SLA is the contract. When a question asks for 'measurement' or 'metric,' choose SLI. When it asks for a 'goal' or 'target,' choose SLO.
Frequently Asked Questions
What is the difference between SLI and SLO?
SLI is the actual metric measured (like current latency), while SLO is the specific target value for that metric (like <200ms).
Why isn't SLA the answer for measuring performance?
SLA is a legal or business agreement with consequences, not the technical mechanism for measuring system health.
Related Analysis
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