/usr/share/check_mk/checks-man/md is in check-mk-server 1.2.8p16-1ubuntu0.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | title: Linux softraid devices
agents: linux
catalog: os/storage
license: GPL
distribution: check_mk
description:
 Checks the current state of a Linux MD raid array. The information
 is read by the agent from {/proc/mdstat}. The result is either
 OK, if all disks are active or critical in any other case.
item:
 The Linux raid device without {/dev/}, for example {"md0"}.
examples:
 checks += [
    ( "somehost", "md", "md0", None )
 ]
inventory:
 All RAID devices except those with raid level 0 are automatically detected.
 The RAID 0 devices's output is completely different from the others.
 And if a disk crashes you will soon notice anyway...
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