Werk #11522: fileinfo.groups: Fix scale of newest age in Perf-O-meter

Component	Checks & agents
Title	fileinfo.groups: Fix scale of newest age in Perf-O-meter
Date	Dec 8, 2020
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0p20 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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