src/Foundation/Providers/LogServiceProvider.php
protected function configureSingleHandler(Writer $log)
    {
        $log->useFiles(
            $this->app->storagePath().'/logs/system.log',
            $this->logLevel()
        );
    }
protected function configureSingleHandler(Writer $log)
    {
        $log->useFiles(
            $this->app->storagePath().'/logs/system.log',
            $this->logLevel()
        );
    }
Configure the Monolog handlers for the application.

@param  \Illuminate\Log\Writer $log

@return void