backend-impl

Structure a FastAPI real-time monitoring backend using Hexagonal Architecture with defined domain models, ports, services, and adapters. This enforces clean separation of concerns while handling live metrics, usage tracking, and alerts.

WebSocket streaming for live metrics works through a dedicated service layer that maintains persistent connections, pushing real-time system metrics and alerts directly to clients via the WebSocket endpoint.

Hexagonal architecture isolates domain logic from external interfaces using ports and adapters. You need it for FastAPI services requiring pluggable components, scalable service layers, and strict separation between domain models, REST APIs, and data sources.

Yes, this backend blueprint targets production-grade monitoring workloads by providing extensible configuration, REST and WebSocket APIs, and a scalable service layer designed for real-world metrics, usage data, and alert deployments.

Start the FastAPI server and verify live metrics streaming by connecting to the /ws/live WebSocket endpoint, which confirms the real-time data pipeline and domain service adapters are functioning correctly.

No external dependencies are required to implement ports and adapters. The blueprint defines pure abstract port interfaces and concrete adapter classes within the FastAPI service layer to support pluggable system metrics and notifications.