This project has been moved to the Eclipse Foundation as Jakarta RESTful Web Services: https://github.com/eclipse-ee4j/jaxrs-api
The original JAX-RS GitHub repository has been moved under Java EE GitHub project: https://github.com/javaee/jax-rs-api. It is read only and won't be updated.
The documentation is available under Jakarta EE Specifications Web page: https://jakarta.ee/specifications/restful-ws/ and also under Eclipse EE4J GitHub Jakarta RESTful Web Services pages: https://eclipse-ee4j.github.io/jaxrs-api/.