What is SRE?
Site Reliability Engineering (SRE) is a discipline that applies software engineering principles to operations and infrastructure problems. SRE teams design, build, and maintain highly scalable, reliable software systems, treating operations as an engineering problem.
SLAs, SLOs, and SLIs
SRE runs on data-driven metrics to balance reliability with deployment speed:
- SLA (Service Level Agreement): A commitment to your customers regarding service uptime and performance, often tied to financial penalties.
- SLO (Service Level Objective): A target reliability metric defined internally (e.g., 99.9% of HTTP requests must return in under 200ms).
- SLI (Service Level Indicator): The actual real-time measurement of your SLO (e.g., current error rate or latency).