diff --git a/docs/user_guide/customizing_dependencies/imagespec.md b/docs/user_guide/customizing_dependencies/imagespec.md
index 7718c1646a..ccdd52fe28 100644
--- a/docs/user_guide/customizing_dependencies/imagespec.md
+++ b/docs/user_guide/customizing_dependencies/imagespec.md
@@ -6,10 +6,6 @@
 .. tags:: Containerization, Intermediate
 ```
 
-:::{note}
-This is an experimental feature, which is subject to change the API in the future.
-:::
-
 `ImageSpec` is a way to specify how to build a container image without a Dockerfile. The `ImageSpec` by default will be
 converted to an [Envd](https://envd.tensorchord.ai/) config, and the [Envd builder](https://github.com/flyteorg/flytekit/blob/master/plugins/flytekit-envd/flytekitplugins/envd/image_builder.py#L12-L34) will build the image for you. However, you can also register your own builder to build
 the image using other tools.
diff --git a/flyteadmin/auth/handlers.go b/flyteadmin/auth/handlers.go
index 0416245f8c..a6220db6e3 100644
--- a/flyteadmin/auth/handlers.go
+++ b/flyteadmin/auth/handlers.go
@@ -260,9 +260,10 @@ func GetAuthenticationCustomMetadataInterceptor(authCtx interfaces.Authenticatio
 		if authCtx.Options().GrpcAuthorizationHeader != DefaultAuthorizationHeader {
 			md, ok := metadata.FromIncomingContext(ctx)
 			if ok {
-				existingHeader := md.Get(authCtx.Options().GrpcAuthorizationHeader)
+				grpcAuthzHeader := authCtx.Options().GrpcAuthorizationHeader
+				existingHeader := md.Get(grpcAuthzHeader)
 				if len(existingHeader) > 0 {
-					logger.Debugf(ctx, "Found existing metadata %s", existingHeader[0])
+					logger.Debugf(ctx, "Found existing metadata header %s", grpcAuthzHeader)
 					newAuthorizationMetadata := metadata.Pairs(DefaultAuthorizationHeader, existingHeader[0])
 					joinedMetadata := metadata.Join(md, newAuthorizationMetadata)
 					newCtx := metadata.NewIncomingContext(ctx, joinedMetadata)