drupal_module__munin_api/modules/munin_core/munin_core.module

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

/**
 * Implements hook_munin_api_info().
 *
 * @return
 *   An array of Munin probes informations, index by probe name.
 */
function munin_core_munin_api_info() {
  $ret = array(
    'munin_core' => array(
      '#title' => t('Drupal core'),
      '#description' => t('Collect core information from a Drupal instance'),
      'user_current' => array(
        '#title'    => t('Currently logged-in users'),
        '#type'     => MUNIN_API_GAUGE,
      ),
      'user_count' => array(
        '#title'    => t('Number of users'),
        '#type'     => MUNIN_API_COUNTER,
      ),
      'user_active_count' => array(
        '#title'    => t('Number of active users'),
        '#type'     => MUNIN_API_COUNTER,
      ),
      'user_blocked_count' => array(
        '#title'    => t('Number of blocked users'),
        '#type'     => MUNIN_API_COUNTER,
      ),

      'node_count' => array(
        '#title'    => t('Number of nodes.'),
        '#type'     => MUNIN_API_COUNTER,
      ),

      'comment_count' => array(
        '#title'    => t('Number of comments.'),
        '#type'     => MUNIN_API_COUNTER,
      ),
    ),
  );

  return $ret;
}