This file is indexed.

/etc/gnats/databases is in gnats-user 4.1.0-3+deb8u1.

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

The actual contents of the file can be viewed below.

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# This file contains a list of databases in the form
# name:description:topleveldir
#
# NAME is the name used to access the database.
#
# DESCRIPTION is an (optional) human-readable description of the contents.
#
# TOPLEVELDIR is the top-level directory where the database is located.
# It must contain a gnats-adm directory with the database configuration
# file, and one or more directories containing PRs.
#
# The clients use the GNATSDB environment variable to determine the default
# name of the database to use; for most clients this may be overridden with
# a "-d databasename" command-line option.
#
# default is the default database.
default:Bug database:/var/lib/gnats/gnats-db