This file is indexed.

/etc/default/mysql is in mariadb-server-10.1 10.1.26-0+deb9u1.

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

The actual contents of the file can be viewed below.

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#
# NOTE: This file is read only by the traditional SysV init script and has been
# available only in Ubuntu 16.04 and 16.10 and never in a official Debian release.
# Debian 9 and Ubuntu 17.04 onwards do not normally read this file as they use
# systemd by default.
#
# For similar behaviour, systemd users should override ExecStart by dropping
# files into /etc/systemd/system/mariadb.service.d/
#
# See also:
# https://wiki.debian.org/Teams/pkg-systemd/Packaging#overriding_options_and_.2Fetc.2Fdefault_handling
# https://mariadb.com/kb/en/mariadb/systemd/
#
# Note also that MariaDB systemd does _not_ utilize mysqld_safe nor debian-start.


# The delay in seconds the init script waits for the server to be up and running after having started "mysqld_safe" to run the "/etc/mysql/debian-start" script.
# If the server is still not responding after the delay, the script won't be executed and an error will be thrown on the syslog.
# Default: 30
#MYSQLD_STARTUP_TIMEOUT=30

# The email recipient(s) of the output of the check for crashed and improperly closed MyISAM and Aria tables done at each server start by the "/etc/mysql/debian-start" script.
# Default: root
#MYCHECK_RCPT="root"