dependency: bump go.opentelemetry.io/otel from v1.14.0 to v1.15.0

[chaochn47]

Noticed by dependabot #15806

Related discussion #15776 (comment)

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

[chaochn47]

TLDR, this version bump is a incompatible change. We should ignore this dependabot notification until the gRPC issue is sorted out.

The following is the explanation of etcd build failures

make build 

stderr: # go.opentelemetry.io/otel/exporters/otlp/otlptrace/internal/otlpconfig
stderr: /home/chaochn/.gvm/pkgsets/go1.19.7/global/pkg/mod/go.opentelemetry.io/otel/exporters/otlp/[email protected]/internal/otlpconfig/options.go:100:62: undefined: internal.GetUserAgentHeader

FAIL: (code:2):
  % (cd server && 'env' 'CGO_ENABLED=0' 'GO_BUILD_FLAGS= -v -mod=readonly' 'GOOS=linux' 'GOARCH=amd64' 'go' 'build' '-v' '-mod=readonly' '-trimpath' '-installsuffix=cgo' '-ldflags=-X=go.etcd.io/etcd/api/v3/version.GitSHA=6b002478c' '-o=../bin/etcd' '.')
FAIL: etcd_build (GOARCH=amd64)
make: *** [build] Error 2

otlptracegrpc is already stuck in v1.11.2 because its direct dependency on google.golang.org/grpc v1.51.0

etcd/server/embed/config_tracing.go

Lines 49 to 53 in 57206f9

	func newTracingExporter(ctx context.Context, cfg *Config) (*tracingExporter, error) {
	exporter, err := otlptracegrpc.New(ctx,
	otlptracegrpc.WithInsecure(),
	otlptracegrpc.WithEndpoint(cfg.ExperimentalDistributedTracingAddress),
	)

when initializing the exporter from otlptracegrpc v1.11.2 package, the internal.GetUserAgentHeader() is only defined in go.opentelemetry.io/otel v1.14.0.

// New constructs a new Exporter and starts it.
func New(ctx context.Context, opts ...Option) (*otlptrace.Exporter, error) {
	return otlptrace.New(ctx, NewClient(opts...))
}

func newClient(opts ...Option) *client {
	cfg := otlpconfig.NewGRPCConfig(asGRPCOptions(opts)...)

import "go.opentelemetry.io/otel/exporters/otlp/internal"

// NewGRPCConfig returns a new Config with all settings applied from opts and
// any unset setting using the default gRPC config values.
func NewGRPCConfig(opts ...GRPCOption) Config {
	cfg := Config{
		Traces: SignalConfig{
			Endpoint:    fmt.Sprintf("%s:%d", DefaultCollectorHost, DefaultCollectorGRPCPort),
			URLPath:     DefaultTracesPath,
			Compression: NoCompression,
			Timeout:     DefaultTimeout,
		},
		RetryConfig: retry.DefaultConfig,
		DialOptions: []grpc.DialOption{grpc.WithUserAgent(internal.GetUserAgentHeader())},
	}

[chaochn47]

cc @ahrtr I will close the PR and corresponding dependabot one if there is no objection.

I wanted to add this information to dependency management doc but I think it's better to spend time on resolving #15145 firstly.

[ahrtr]

cc @ahrtr I will close the PR and corresponding dependabot one if there is no objection.

I have no objection. Thank you for the confirmation.

I wanted to add this information to dependency management doc

Please feel free to deliver a PR. Thanks