CSDS is part of the Envoy xDS protocol: https://www.envoyproxy.io/docs/envoy/latest/api-v3/service/status/v3/csds.proto. It allows the gRPC application to programmatically expose the received traffic configuration (xDS resources). Welcome to explore with CLI tool "grpcdebug": https://github.com/grpc-ecosystem/grpcdebug.

For any issues or suggestions, please send to https://github.com/grpc/grpc/issues.