This file is indexed.

/etc/icinga/resource.cfg is in icinga-common 1.13.3-2.

This file is owned by root:root, with mode 0o600.

The actual contents of the file can be viewed below.

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###########################################################################
#
# RESOURCE.CFG - Resource File for Icinga
# 
# You can define $USERx$ macros in this file, which can in turn be used
# in command definitions in your host config file(s).  $USERx$ macros are
# useful for storing sensitive information such as usernames, passwords, 
# etc.  They are also handy for specifying the path to plugins and 
# event handlers - if you decide to move the plugins or event handlers to
# a different directory in the future, you can just update one or two
# $USERx$ macros, instead of modifying a lot of command definitions.
#
# The CGIs will not attempt to read the contents of resource files, so
# you can set restrictive permissions (600 or 660) on them.
#
# Icinga supports up to 32 $USERx$ macros ($USER1$ through $USER32$)
#
# Resource files may also be used to store configuration directives for
# external data sources like MySQL...
#
###########################################################################

# Sets $USER1$ to be the path to the plugins
$USER1$=/usr/lib/nagios/plugins

# Sets $USER2$ to be the path to event handlers
#$USER2$=/usr/lib/icinga/plugins/eventhandlers

# Store some usernames and passwords (hidden from the CGIs)
#$USER3$=someuser
#$USER4$=somepassword