Deployment Frequency

Deployment Frequency est l'une des 4 DORA metrics : combien souvent une organisation déploie en production avec succès. Mesure la vélocité de delivery. Tier Elite atteint multiple déploiements par jour (Amazon : 1 deploy/seconde Q4 stats célèbres ; Netflix : milliers/jour cumulés services).

Tiers DORA :
- Elite : multiple per day (typically: many small deploys)
- High : daily to weekly
- Medium : weekly to monthly
- Low : less than monthly (often quarterly/annual releases)

High deployment frequency requires : (1) trunk-based development ; (2) CI/CD pipeline automated ; (3) comprehensive automated tests (no manual gate) ; (4) feature flags (deploy decoupled from release) ; (5) deployment strategies safe (canary, blue/green, rolling) ; (6) automated rollback capability ; (7) production observability ; (8) error budgets governance (allows risk-taking when budget available).

Counter-intuitive finding (Accelerate book) : high deployment frequency correlates positively avec stability (low change failure rate, low MTTR). Plus on déploie petites changements, moins risque par déploiement, plus l'expertise opérationnelle se développe.

Mesurer : count(production deployments) / time period. Tools mêmes que Lead Time (Jellyfish, Sleuth, etc.). Important to count successful deployments (excluding rolled back), and to define what "production deployment" means (config change? full release? service-by-service or grouped?).