This file is indexed.

/etc/mysql/percona-xtradb-cluster.cnf is in percona-xtradb-cluster-server-5.6 5.6.21-25.8-0ubuntu3.

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

The actual contents of the file can be viewed below.

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#
# The Percona XtraDB Cluster 5.6 configuration file.
#
#
# * IMPORTANT: Additional settings that can override those from this file!
#   The files must end with '.cnf', otherwise they'll be ignored.
#   Please make any edits and changes to the appropriate sectional files
#   included below.
#
!includedir /etc/mysql/conf.d/
!includedir /etc/mysql/percona-xtradb-cluster.conf.d/