(new Logger('郵件發送失敗'))
 ->pushHandler(new RotatingFileHandler(storage_path('logs/email_send.log')))
 ->info(json_encode([
 'data' => $notifiable,
 'error' => $e->getMessage()
 ],320));

use Log;
...

public function testLog()
{
 $customer_id = 111;
 $code = 333;
 Log::getMonolog()->popHandler();
 Log::useFiles(storage_path('logs/data_info_market.log'), 'info');
 Log::info('==>id=' . $customer_id . ',code=' . $code);
}