Envoy Proxy xDS Discovery API

The Envoy xDS (x Discovery Service) REST API provides endpoints for dynamically discovering and configuring Envoy proxy resources including clusters (CDS), listeners (LDS), routes (RDS), endpoints (EDS), secrets (SDS), and runtime configuration (RTDS). The xDS protocol is the foundation of Envoy's dynamic configuration model, enabling control planes to push configuration updates to Envoy instances without requiring restarts.