What are the core principles behind SLIs, SLOs, SLAs?

SLIs (Service Level Indicators), SLOs (Service Level Objectives), and SLAs (Service Level Agreements) are essential concepts in the DevOps and Site Reliability Engineering (SRE) domains. They help organizations define, measure, and ensure the reliability and quality of their services.

Core Principles

  • SLIs: These are quantitative measures used to evaluate the performance of a service. Common SLIs include availability, latency, and error rates.
  • SLOs: These define the target level of reliability or performance for an SLI. They articulate acceptable levels of service that a team aims to meet, such as "99.9% uptime".
  • SLAs: These are formal agreements between service providers and customers that stipulate the expected service levels, including penalties for failing to meet them. They often include legal implications.

Example

<?php // Example of defining SLI, SLO, and SLA $sli = "Availability"; // measure the percentage of uptime $slo = "99.9%"; // target uptime $sla = "If availability drops below 99.9%, 10% refund for the month"; // agreement with customer echo "SLI: $sli\n"; echo "SLO: $slo\n"; echo "SLA: $sla\n"; ?>

SLIs SLOs SLAs DevOps Site Reliability Engineering

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