Percona Server for MySQL 5.7.21-21 - /etc/my.cnf was overwritten

I installed Percona Server for MySQL 5.7.21-21 this morning using the RPM for CentOS 7 - Percona-Server-server-57-5.7.21-21.1.el7.x86_64.rpm.

After installing, MySQL didn't start up.  It appears that /etc/my.cnf was overwritten and now  points to /etc/alternatives/my.cnf.  Also, the previous /etc/my.cnf was not saved.

Can you please check this?

Thanks,
Ryan