This file is indexed.

/etc/icinga2/icinga2.conf is in icinga2-common 2.8.1-0ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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/**
 * Icinga 2 configuration file
 * - this is where you define settings for the Icinga application including
 * which hosts/services to check.
 *
 * For an overview of all available configuration options please refer
 * to the documentation that is distributed as part of Icinga 2.
 */

/**
 * The constants.conf defines global constants.
 */
include "constants.conf"

/**
 * The zones.conf defines zones for a cluster setup.
 * Not required for single instance setups.
 */
include "zones.conf"

/**
 * The Icinga Template Library (ITL) provides a number of useful templates
 * and command definitions.
 * Common monitoring plugin command definitions are included separately.
 */
include <itl>
include <plugins>
include <plugins-contrib>
include <manubulon>

/**
 * This includes the Icinga 2 Windows plugins. These command definitions
 * are required on a master node when a client is used as command endpoint.
 */
include <windows-plugins>

/**
 * This includes the NSClient++ check commands. These command definitions
 * are required on a master node when a client is used as command endpoint.
 */
include <nscp>

/**
 * The features-available directory contains a number of configuration
 * files for features which can be enabled and disabled using the
 * icinga2 feature enable / icinga2 feature disable CLI commands.
 * These commands work by creating and removing symbolic links in
 * the features-enabled directory.
 */
include "features-enabled/*.conf"

/**
 * Although in theory you could define all your objects in this file
 * the preferred way is to create separate directories and files in the conf.d
 * directory. Each of these files must have the file extension ".conf".
 */
include_recursive "conf.d"