This file is indexed.

/etc/mysql/percona-xtradb-cluster.conf.d/client.cnf 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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[client]
port            = 3306
socket          = /var/run/mysqld/mysqld.sock