# EMQX Replay `emqx_ds` is a durable storage for MQTT messages within EMQX. It implements the following scenarios: - Persisting messages published by clients - > 0. App overview introduction > 1. let people know what your project can do specifically. Is it a base > library dependency, or what kind of functionality is provided to the user? > 2. Provide context and add a link to any reference visitors might be > unfamiliar with. > 3. Design details, implementation technology architecture, Roadmap, etc. # [Features] - [Optional] > A List of features your application provided. If the feature is quite simple, just > list in the previous section. # Limitation TBD # Documentation links TBD # Usage TBD # Configurations TBD # HTTP APIs # Other TBD # Contributing Please see our [contributing.md](../../CONTRIBUTING.md).