Kohana Logs

I see an example of the 'alert' log in the g2_import module:
Kohana_Log::add("alert", $msg);

But in a module I'm developing I tried:
Kohana_Log::add("alert", "Some text");

It never shows but if I change it to error:
Kohana_Log::add("error", "some text");
It works.

Is there a level that is set to add alert messages to the log that I 
can't find?

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