I am using symfony 4.1 and monolog 3.3.
I have my symfony project in the following directory: `/var/www/html/{project_dir}`.
In production environment I want my logs to be stored inside `/tmp/foo` instead of standard symfony directory: `{project_dir_path}/var/log`.

I changed `Kernel::getLogDir()` method to the following:

```php
public function getLogDir()
{
    return 'prod' === $this->environment
        ? '/tmp/foo'
        : $this->getProjectDir().'/var/log';
}

```

My production `monolog.yaml` path looks like this:

```
path: "%kernel.logs_dir%/%kernel.environment%.log"

```

My environment for testing issues is set to 'prod'.

When I am debugging, I can see that monolog's log directory is correctly set to `/tmp/foo`. `/tmp/foo` has proper access rights (0766) but when I try to log something, the directory contains nothing.