xds: set client node.BuildVersion to gRPC version (#3140)

xds/internal/client/config.go

@@ -23,6 +23,7 @@ package client
 import (
 	"bytes"
 	"encoding/json"
+	"fmt"
 	"io/ioutil"
 	"os"
 
@@ -40,6 +41,8 @@ const (
 	googleDefaultCreds = "google_default"
 )
 
+var gRPCVersion = fmt.Sprintf("gRPC-Go %s", grpc.Version)
+
 // For overriding from unit tests.
 var fileReadFunc = ioutil.ReadFile
 
@@ -124,6 +127,7 @@ func NewConfig() *Config {
 				grpclog.Errorf("xds: jsonpb.Unmarshal(%v) failed during bootstrap: %v", string(v), err)
 				break
 			}
+			n.BuildVersion = gRPCVersion
 			config.NodeProto = n
 		case "xds_server":
 			xs := &xdsServer{}

xds/internal/client/config_test.go

@@ -39,6 +39,7 @@ var (
 				},
 			},
 		},
+		BuildVersion: gRPCVersion,
 	}
 	nilCredsConfig = &Config{
 		BalancerName: "trafficdirector.googleapis.com:443",