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It is very simple to use, because it creates a Logger::log method (yes, this is namespace corruption, so shoot me). If you don't like this, feel free to post directly to your logger as follows:
$kernel->post('logger', 'log', "An error occurred: $!");
All logging is done in the background, so don't expect immediate output - the output will only occur after control goes back to the kernel so it can process the next event.