In the project directory, you can run:
envoy is optional,
It is necessary for the front to use grpc directly, but it is not necessary if the api of the webbackend is used.
You need to check the .service file. (envoy grpc proxy, monitoring-backend service)
install envoy : Install : https://www.envoyproxy.io/docs/envoy/latest/start/install#install-envoy-on-ubuntu-linux