Werk #450: mem.used: Add information about shared memory (on Linux hosts)

Component	Checks & agents
Title	mem.used: Add information about shared memory (on Linux hosts)
Date	Jan 17, 2014
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.5i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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