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- Fix spring-boot scrape target from backend:8080 to backend:8081 (actuator/management port) - Restrict Prometheus host port binding to 127.0.0.1 to prevent unintended external exposure - Add observability stack (Prometheus, Node Exporter, cAdvisor) to topology description - Add PORT_PROMETHEUS env var to DEPLOYMENT.md reference table Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>