The sub tree stores the notification information for the maintenance service for the reseller Reseller Ltd. with the uid 4000000. This information is used as a fallback. The lookup is as follows:
# Service
# Customer: <code>ou=notifications,uid=4000001,ou=customers,ou=configuration,ou=maintenance,ou=services,dc=stoney-cloud,dc=org</code># Reseller: <code>ou=notifications,uid=4000000,ou=reseller,ou=configuration,ou=maintenance,ou=services,dc=stoney-cloud,dc=org</code># Default Reseller: <code>ou=notifications,uid=4000000,ou=reseller,ou=configuration,ou=maintenance,ou=services,dc=stoney-cloud,dc=org</code>
The idea is, that even if somebody forgot to define something, no maintenance window will be lost or forgotten.