Crust::Middleware::Syslog

use Crust::Builder;
use Crust::Middleware::Syslog;

builder {
    enable 'Syslog', ident => 'MyApp';
    $app;
}

or

use Crust::Middleware::Syslog;

$app = Crust::Middleware::Syslog.new($app);

And in your app:

%env<p6sgix.logger>('debug', 'Things happened!');