The ApiLogger plugin allows random sampling of API requests.

Installation
============
add "addPlugin('ApiLogger');"
to the bottom of your config.php

Settings
========
frequency: How often to sample (number between 0.0 and 1.0 representing
percentage -- e.g.: 0.1 will check about 10% of hits). Default 1.0

Example
=======
addPlugin('ApiLogger', array(
    'frequency' => 1.0
));