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Difficulty: EasyAligning Technical Service Level Objectives (SLAs/SLOs/SLIs) with Business Objectives

An e-commerce platform hosted on Google Cloud calculates the ratio of successful checkout API calls to total checkout API calls over a given billing period to evaluate real-time user experience. Which Site Reliability Engineering (SRE) component is represented by this measured ratio?

  1. Service Level Indicator (SLI)Answer
  2. B
    Service Level Objective (SLO)
  3. C
    Service Level Agreement (SLA)
  4. D
    Error Budget

Answer

Service Level Indicator (SLI)
A Service Level Indicator (SLI) is a quantifiable measure of service performance delivered to users in real time. Calculating the ratio of successful API calls to total API calls yields a direct SLI measurement.

Step-by-Step Solution

1
Identify the nature of the metric described in the scenario.
The metric represents an empirical calculation of Successful RequestsTotal Requests\frac{\text{Successful Requests}}{\text{Total Requests}} collected from live production traffic.
Determining whether a metric is an empirical measurement, a target boundary, or a legal commitment is necessary to accurately classify SRE components.
2
Map the measurement definition to standard SRE concepts.
The measured ratio of actual good events to total events is defined as a Service Level Indicator (SLI).
SLIs provide the real-time quantitative data required to evaluate compliance against a Service Level Objective (SLO).

Key Concept

Distinguishing Service Level Indicators (SLIs) as empirical operational measurements from Service Level Objectives (SLOs) and Agreements (SLAs).
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Topics

Aligning Technical Service Level Objectives (SLAs/SLOs/SLIs) with Business Objectives