/usr/share/doc/php5-apcu/README.Debian is in php5-apcu 4.0.7-1.
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NOTES FOR DEBIAN USERS ====================== 1. Viewing statistics and tunning your userland cache The script apc.php that comes with APCu provides detailed information about your cache statistics. In Debian you will need to copy or symlink script from /usr/share/doc/php5-apcu to your desired location (like a docroot) and access it from the browser. The script will provide additional graphics if you install the php5-gd package. In order to understand the information and use it to tune you cache refer to the APCu documentation at: http://pecl.php.net/package/APCu -- Ondřej Surý <email@example.com>, Wed, 15 May 2013 09:33:39 +0200