use Illuminate\Support\Facades\Log;

Log::channel('vehicle')->info('==xxx任务开始==');

config/logging.php

channels配置项中添加

'channels' => [
  // ...
  'vehicle' => [
    'driver' => 'daily',
    'path' => storage_path('logs/vehicle/off_shelf.log'),
     'level' => 'info',
     'days' => 7
  ],
  // ...
]

vendor/laravel/framework/src/Illuminate/Log/LogManager.php