Subtrace

Subtrace is a debugging tool designed for developers working with containerised applications. It monitors Docker containers and provides detailed visibility into HTTP requests and responses, showing payloads, headers, status codes, and latency measurements. The tool uses a Wireshark-like interface similar to Chrome DevTools, making it accessible to developers familiar with browser inspection tools. Unlike general monitoring platforms such as Sentry or OpenTelemetry, Subtrace focuses specifically on request-level inspection for backend servers. It's particularly useful when you need to see exactly what data is flowing in and out of your application. The tool supports automatic tracing without requiring code changes, can filter requests by various criteria, and offers a self-hosted option for teams concerned about data privacy. Subtrace works with Linux, Docker, and Kubernetes environments. It's suited for developers debugging API behaviour, investigating performance issues, conducting security audits, or troubleshooting production problems without relying on external logging infrastructure.