Werk #11910: Add warn/crit metrics for percentage usage of filesystems

Component	Checks & agents
Title	Add warn/crit metrics for percentage usage of filesystems
Date	Jan 11, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0b4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Levels where only shown for absolute size. This has been fixed.

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