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Difficulty: EasyDefining and Managing SLOs, SLIs, and Error Budgets

An Site Reliability Engineering (SRE) team is defining operational reliability metrics for an HTTP-based backend API running on Cloud Run. The team wants to track the exact proportion of successful HTTP requests against total HTTP requests over a 30-day window to measure actual system performance. Which Site Reliability Engineering (SRE) metric component does this specific measurement represent?

  1. Service Level Indicator (SLI)Answer
  2. B
    Service Level Objective (SLO)
  3. C
    Service Level Agreement (SLA)
  4. D
    Static Resource Threshold Alert

Answer

The specific measurement of successful requests over total requests represents a Service Level Indicator (SLI).
The correct answer is Service Level Indicator (SLI). An SLI is a carefully defined quantitative measure of a service's performance, such as latency or successful request ratio. Measuring valid requests divided by total requests yields an SLI.

Step-by-Step Solution

1
Identify the nature of the measurement specified in the scenario.
The metric measures actual historical performance ratio (successful requests divided by total requests).
Quantifiable measurements of service performance constitute indicators.
2
Differentiate between SLI, SLO, and SLA concepts.
SLI is the actual metric measured; SLO is the target objective for that metric; SLA is the formal contract with penalties.
Understanding the baseline definitions ensures proper classification of SRE metrics.

Key Concept

Distinction between Service Level Indicators (SLIs), Service Level Objectives (SLOs), and Service Level Agreements (SLAs).
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Topics

Defining and Managing SLOs, SLIs, and Error Budgets

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