use function Innmind\Logger\bootstrap;
use Innmind\Url\Url;

$logger = bootstrap(
    'myApp',
    Url::of('file://'.__DIR__.'/var/log.txt'),
    Url::of('sentry://user@sentry.io/project-id'),
);

$concrete = $logger();
$fingersCrossed = $logger('error');

In this example both $concrete and $fingersCrossed are instances of Psr\Log\LoggerInterface with the first one that will write each log to the specified file and to sentry, the latter will only write logs when the error level is reached.

If you want to specify the log level for each handler you can do it by adding the level query parameter in the handler url.