Set user-agent for client-go (#2559)

build/backend.js

@@ -35,6 +35,9 @@ gulp.task('backend', ['package-backend'], function(doneFn) {
         'build',
         // Install dependencies to speed up subsequent compilations.
         '-i',
+        // record version info into src/version/version.go
+        '-ldflags',
+        conf.recordVersionExpression,
         '-o',
         path.join(conf.paths.serve, conf.backend.binaryName),
         conf.backend.mainPackageName,
@@ -116,6 +119,9 @@ function backendProd(outputBinaryPathsAndArchs) {
             '-a',
             '-installsuffix',
             'cgo',
+            // record version info into src/version/version.go
+            '-ldflags',
+            conf.recordVersionExpression,
             '-o',
             path,
             conf.backend.mainPackageName,

build/conf.js

@@ -75,6 +75,12 @@ const imageNameBase = 'kubernetes-dashboard';
  * Exported configuration object with common constants used in build pipeline.
  */
 export default {
+  /**
+   * the expression of recording version info into src/app/backend/client/manager.go
+   */
+  recordVersionExpression:
+      `-X github.com/kubernetes/dashboard/src/app/backend/client.Version=${version.release}`,
+
   /**
    * Configuration for container registry to push images to.
    */

src/app/backend/client/manager.go

@@ -42,8 +42,13 @@ const (
 	DefaultCmdConfigName = "kubernetes"
 	// Header name that contains token used for authorization. See TokenManager for more information.
 	JWETokenHeader = "jweToken"
+	// Default http header for user-agent
+	DefaultUserAgent = "dashboard"
 )
 
+// VERSION of this binary
+var Version = "UNKNOWN"
+
 // ClientManager is responsible for initializing and creating clients to communicate with
 // kubernetes apiserver on demand
 type ClientManager interface {
@@ -188,6 +193,7 @@ func (self *clientManager) initConfig(cfg *rest.Config) {
 	cfg.QPS = DefaultQPS
 	cfg.Burst = DefaultBurst
 	cfg.ContentType = DefaultContentType
+	cfg.UserAgent = DefaultUserAgent + "/" + Version
 }
 
 // Returns rest Config based on provided apiserverHost and kubeConfigPath flags. If both are