context.go
func TitleFromContext(ctx context.Context) string {
	id, ok := ctx.Value(TraceIDKey).(string)
	if !ok {
		return ""
	}
	return id
}
func TitleFromContext(ctx context.Context) string {
	id, ok := ctx.Value(TraceIDKey).(string)
	if !ok {
		return ""
	}
	return id
}
// TitleFromContext is a convenience function that returns the Trace's title from a context
// or an empty string if none exists