Route discovery service (RDS)¶
The route discovery service (RDS) API is an optional API that Envoy will call to dynamically fetch route configurations. A route configuration includes both HTTP header modifications, virtual hosts, and the individual route entries contained within each virtual host. Each HTTP connection manager filter can independently fetch its own route configuration via the API.
Statistics¶
RDS has a statistics tree rooted at http.<stat_prefix>.rds.<route_config_name>..
Any : character in the route_config_name name gets replaced with _ in the
stats tree. The stats tree contains the following statistics:
| Name | Type | Description |
|---|---|---|
| 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 (either network or schema errors) |
| version | Gauge | Hash of the contents from the last successful API fetch |