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1.Added telemetry_innodb_dir config option to store telemetry table on external storage
2.Bug fixes

How to enable external innodb directory on MySQL?
(Suppose the directory is /var/lib/mysqlext)

0.Create directory, change permission

chown mysql:mysql /var/lib/mysqlext

1.Open /etc/mysql/mysql.conf.d/mysqld.cnf and add

innodb_directories = /var/lib/mysqlext/ # this adds the directory to known innodb directory
secure-file-priv = /var/lib/mysqlext/ # this allows non-root user to create table with DATA DIRECTORY

2.Grant FILE privilege to database user (which does not seems to be included in ALL privileges)

3.Reload mysqld: systemctl restart mysql

4.Open /etc/apparmor.d/usr.sbin.mysqld and add

/var/lib/mysqlext/ r,
/var/lib/mysqlext/** rwk,

5.Reload apparmor: service apparmor reload