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/usr/share/check_mk/checks-man/users is in check-mk-server 1.2.6p12-1.

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title: Number of Users Currently Logged In
agents: linux
catalog: os/misc
license: GPL
distribution: check_mk
description:
 Monitor the number of users currently logged in.
 The default levels are set to {20} and {30}.

inventory:
 A check of this type is created automatically on each Linux host as soon
 as the mk_users plugin is installed on the host.

perfdata:
 On variable: the current number of users logged in

[parameters]
warn (int): Number of users logged in at which a warning level
 is triggered
crit (int): Number for a critical state

[configuration]
users_default_levels (int, int): Levels used for all checks found
 by inventory. This variable is preset to {(20, 30)}.