This file is indexed.

/etc/xinetd.d/mysqlchk is in percona-xtradb-cluster-server-5.7 5.7.20-29.24-0ubuntu2.

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

The actual contents of the file can be viewed below.

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# default: on 
# description: mysqlchk 
service mysqlchk 
{ 
# this is a config for xinetd, place it in /etc/xinetd.d/
        disable = no 
        flags           = REUSE 
        socket_type     = stream 
        type            = UNLISTED
        port            = 9200 
        wait            = no 
        user            = nobody 
        server          = /usr/bin/clustercheck
        log_on_failure  += USERID 
        only_from       = 0.0.0.0/0
        #
        # Passing arguments to clustercheck
        # <user> <pass> <available_when_donor=0|1> <log_file> <available_when_readonly=0|1> <defaults_extra_file>"
        # Recommended: server_args   = user pass 1 /var/log/log-file 0 /etc/my.cnf.local"
        # Compatibility: server_args = user pass 1 /var/log/log-file 1 /etc/my.cnf.local"
        # 55-to-56 upgrade: server_args = user pass 1 /var/log/log-file 0 /etc/my.cnf.extra"
        #
        # recommended to put the IPs that need 
        # to connect exclusively (security purposes) 
        per_source      = UNLIMITED 
}