<ul data-eligibleForWebStory="true">Cross-validation is integral for robust, observable ML systems from training to deployment.Modern ML Ops integrates cross-validation into CI/CD, A/B testing, and monitoring frameworks.Use cases span diverse sectors like e-commerce, fintech, health tech, automotive, and social media.Strategies include Python orchestration, Kubernetes deployment, and experiment tracking for reproducibility.Failure modes, risk management, system optimization, monitoring, security, and best practices discussed.