Ci Cd

Eight Accelerate-validated CD capabilities; key empirical findings: config-in-VCS more predictive than code, developer-owned tests, trunk-based development, loosely coupled architecture as the single largest CD lever; shift-left security (DevSecOps); lightweight change approval vs CABs; relationship between CD, culture, burnout, and job satisfaction

Fitness function automation; stages, fan-in/fan-out; CD vs CDP; cycle time as business metric; zero-downtime deployment (four phases: prepare/drain/apply/start); expand/contract relational schema pattern; trickle-then-batch schemaless migration; canary group evaluation; immutable infrastructure; EDM deployment patterns

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