Sre — Software Architecture

Automation concept

Automation vs autonomy; 5-level hierarchy (manual → autonomous); safety properties (rate limiting, idempotency); MySQL on Borg case study

Data Integrity concept

Data integrity vs availability distinction; replication ≠ recoverability; failure mode matrix (cause × scope × rate); defence in depth: soft deletion / tiered backups / out-of-band validation; point-in-time recovery; continuously test restore; Gmail and Google Music case studies

Error Budgets concept

error budget = 1 − SLO target; resolves dev/ops conflict by aligning incentives; budget exhaustion triggers release freeze; burn rate alerting; 100% is wrong target argument

Incident Management concept

Hypothetico-deductive troubleshooting; ICS roles; "only Ops modifies"; blameless postmortems; outage tracking; ML incident response (harder detection, broader scope, fuzzy timeline, RPO/RTO for ML)

Reliable Machine Learning source

*Reliable Machine Learning* — Chen, Murphy, Parisa, Sculley, Underwood

Site Reliability Engineering concept

SRE as discipline: dev/ops conflict; error budgets; toil cap (50%); SLO-driven alerting; blameless postmortems; SRE vs DevOps distinction; applicability outside Google

Site Reliability Engineering source

*Site Reliability Engineering* — Beyer, Jones, Petoff, Murphy

Testing for Reliability concept

Zero-MTTR via pre-production testing; traditional test hierarchy; production tests (config tests, stress tests, canary); production probes; barrier defence pattern; configuration file risk management