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

An enterprise organization tracks the performance of its order fulfillment API hosted on Google Cloud. The engineering team has established a target goal of achieving 99.9%99.9\% successful API responses over a rolling 30-day window to align with customer experience goals. Which component specifically represents the quantifiable metric of actual, real-time successful responses divided by total requests?

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

Answer

Service Level Indicator (SLI)
A Service Level Indicator (SLI) is the specific metric that quantifies performance, such as the ratio of successful API requests to total API requests measured over time.

Step-by-Step Solution

1
Identify the role of the metric being requested
The scenario asks for the metric that calculates actual performance (successful requests divided by total requests).
Differentiating between measurement metrics and target threshold values is fundamental to Site Reliability Engineering (SRE).
2
Map the SRE terminology to the scenario elements
The target goal (99.9%99.9\%) is the SLO, while the calculated ratio of valid requests is the SLI.
An SLI measures compliance against the defined SLO.

Key Concept

Service Level Indicator (SLI) vs Service Level Objective (SLO) alignment
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Topics

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