`cls-rtracer` is a request tracing library for Node.js applications that automatically generates and manages request IDs using the `AsyncLocalStorage` API. It provides Express, Fastify, Koa, and Hapi middleware/plugins to generate UUID V1 request IDs (or use values from `X-Request-Id` headers) and make them accessible throughout the request lifecycle for logging and debugging purposes. The library is designed for developers building web applications who need to correlate log entries across distributed systems and track requests through their entire processing pipeline.