Werk #7562: Orphan historic metrics are now also cleaned up by diskspace cleanup

Component	Site management
Title	Orphan historic metrics are now also cleaned up by diskspace cleanup
Date	Apr 19, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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