drupal_module__munin_api/modules/munin_apc/munin_apc.module

<?php
// $Id$
/**
 * @file
 * APC instrumentation for Munin
 */

/**
 * Implements hook_munin_api_info().
 *
 * @return
 *   An array of Munin probes informations, index by probe name.
 */
function munin_apc_munin_api_info() {
  $ret = array(
    'munin_apc' => array(
      '#title' => t('PHP APC'),
      '#description' => t('Collect cache information for the Alternative PHP Cache'),
      'total_size' => array(
        '#title'    => t('Number of bytes allocated to APC'),
        '#type'     => MUNIN_API_COUNTER,
      ),
      'used_size' => array(
        '#title'    => t('Number of bytes currently used by APC, either cached or deleted'),
        '#type'     => MUNIN_API_COUNTER,
      ),
      'num_hits' => array(
        '#title'    => t('The number of hits since the last restart'),
        '#type'     => MUNIN_API_COUNTER,
      ),
      'num_misses' => array(
        '#title'    => t('The number of misses since the last restart'),
        '#type'     => MUNIN_API_COUNTER,
      ),
      'hit_rate'   => array(
        '#title'    => t('This hit/miss ration since the last restart'),
        '#type'     => MUNIN_API_GAUGE,
      ),
      'num_insertions' => array(
        '#title'    => t('The number of insertions since the last restart'),
        '#type'     => MUNIN_API_COUNTER,
      ),
      'cache_entries' => array(
        '#title'    => t('The number of cache entries'),
        '#type'     => MUNIN_API_GAUGE,
      ),
      'deleted_entries' => array(
        '#title'    => t('The number of deleted entries lingering'),
        '#type'     => MUNIN_API_GAUGE,
      ),
    ),
  );

  return $ret;
}