Usage of /usr/bin/grpc-health-probe:
  -addr string
    	(required) tcp host:port to connect
  -connect-timeout duration
    	timeout for establishing connection (default 1s)
  -rpc-timeout duration
    	timeout for health check rpc (default 1s)
  -service string
    	service name to check (default: "")
  -user-agent string
    	user-agent header value of health check requests (default "grpc-health-probe")
  -v	verbose logs