The LDAP Tool Box project offers a number of tools, scripts, and other niceties for working with LDAP. One of the items they provide is a set of Nagios plugins that can help monitor LDAP directory servers. Today, they tweeted about a new Check 389DS cn=monitor information” plugin that can look at the monitoring information that the 389 Directory Server offers, including things like the number of established connections, active threads, operations processed, and entries returned by the server.