spanner: failed to NewClient WithCredentialsJSON, might be caused by newBuiltinMetricsTracerFactory

[RainbowDashy]

Client

spanner

Environment

go 1.23.2

Code and Dependencies

package spanner_test

import (
	"context"
	"log"
	"testing"

	"cloud.google.com/go/spanner"
	"google.golang.org/api/option"
)

func TestConnect(t *testing.T) {
	ctx := context.Background()
	j := "<service account key in json format>"
	_, err := spanner.NewClient(ctx, "projects/foo/instances/bar/databases/d", option.WithCredentialsJSON([]byte(j)))
	if err != nil {
		log.Fatal(err)
	}
}

go.mod

module modname

go 1.23.2

require (
   	cloud.google.com/go/spanner v1.71.0
)

Expected behavior

I expect no error. But I get the error
credentials: could not find default credentials. See https://cloud.google.com/docs/authentication/external/set-up-adc for more information.

With some debugging, I found out that the error is returned by newBuiltinMetricsTracerFactory at L510.

google-cloud-go/spanner/client.go

Line 510 in f06a55a

metricsTracerFactory, err := newBuiltinMetricsTracerFactory(ctx, database, metricsProvider, config.Compression, opts...)

It seems to me that the problem is newBuiltinMetricsTracerFactory doesn't respect the WithCredentialsJSON option.