I have found two contradictory reports in maintenance dashboard for production author
1. Daily Maintenance Window says "Version Purge Succeeded on Web Nov 08 02:30 CEST 2017" see attached screen shot "versionPurge.jpg"
2. System health check report says'Maintenance task with name 'RevisionCleanupTask'has' never run see attached screen shot "HealthCheckup.jpg"
Also observed that there are lots of nodes in jcr:system/jcr:versionStorage(disk usage report says 13.8 GB ).
Log has lots of warning
"*WARN* [pool-44-thread-1] org.apache.jackrabbit.oak.security.authorization.permission.CompiledPermissionImpl Cannot retrieve versionable node for /jcr:system/jcr:versionStorage/ca/ef/e7/caefe712-61ca-4932-baf8-71089cd1a288"
I tried to run version purging manually but it doesn't make any difference because i can see lot's of version nodes from 2016 is still exists & size is same.
Please provide your input.