Werk #15604: check_mk_agent.linux: Extend support to old lsblk versions

Component	Checks & agents
Title	check_mk_agent.linux: Extend support to old lsblk versions
Date	Apr 13, 2023
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0b4 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p27 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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