.. _config_http_conn_man_rds: Route discovery service (RDS) ============================= The route discovery service (RDS) API is an optional API that Envoy will call to dynamically fetch :ref:`route configurations `. A route configuration includes both HTTP header modifications, virtual hosts, and the individual route entries contained within each virtual host. Each :ref:`HTTP connection manager filter ` can independently fetch its own route configuration via the API. * :ref:`v2 API reference ` Statistics ---------- RDS has a statistics tree rooted at *http..rds..*. Any ``:`` character in the ``route_config_name`` name gets replaced with ``_`` in the stats tree. The stats tree contains the following statistics: .. csv-table:: :header: Name, Type, Description :widths: 1, 1, 2 config_reload, Counter, Total API fetches that resulted in a config reload due to a different config update_attempt, Counter, Total API fetches attempted update_success, Counter, Total API fetches completed successfully update_failure, Counter, Total API fetches that failed because of network errors update_rejected, Counter, Total API fetches that failed because of schema/validation errors version, Gauge, Hash of the contents from the last successful API fetch