/usr/share/check_mk/checks-man/mknotifyd.connection 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 | title: Check_MK Notification Spooler Connection
agents: linux
catalog: app/check_mk
license: GPL
distribution: check_mk
description:
 This check checks the status of indiviual TCP connections from a
 Check_MK Notification Spooler to a remote spooler. For each incoming
 and outoing TCP connection one service will be created the goes
 critical if the connection is not up.
item:
 The name of the site followed by a dash followed by either IPADDRESS{:}PORT for
 outgoing connections or IPADDRESS for incoming connections. If more than one
 incoming connections exist from the same remote host then an index will be
 appended.
inventory:
 One sevice per site and connection will be created.
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