I've created the following Grafana dashboard for recent OpenLDAP releases (2.4.49 or later) that obtains data from the MDB backend database in addition to the normal OpenLDAP stats. May need adjustment for which database the primary DB is (It assumes DB#1)
https://grafana.com/grafana/dashboards/13349
--Quanah
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Quanah Gibson-Mount Product Architect Symas Corporation Packaged, certified, and supported LDAP solutions powered by OpenLDAP: http://www.symas.com