For performance reasons, Moodle should always be run with a Caching backend. APCu is such a caching backend which is directly available in the PHP runtime. Unfortunately, APCu is kind of a black box and doesn't provide a management interface by default.
Luckily, the APCu developers provide a single-file APCu management GUIs within their codebase (https://github.com/krakjoe/apcu/). As a Moodle server administrator, you can just throw the apc.php file somewhere onto your Moodle server and get a APCu management GUI instantly. However, this approach requires that you protect the APCu management GUI from unauthorized access manually in your webserver and comes with the downside that the APCu management GUI is located outside Moodle.
For these reasons, we provide a wrapper to the APCu management GUI as a very simple Moodle admin tool providing it within Moodle site administration for Moodle administrators only.
Please see README file for details about the usage and features of this plugin.
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