Nagios results are cached if anonymous caching is turned on

If anonymous page caching is turned on, the Nagios results page will be cached, thereby Drupal tells Nagios how it was when the page was first hit, not how it is now. This rather effectively defeats the purpose of monitoring in the first place :)

The fix is simple - the first line of nagios_status_page() should be drupal_page_is_cacheable(FALSE);