Does MariaDB 5.5.56 have INFORMATION_SCHEMA.INNODB_METRICS? I'm trying to debug why I don't have INFORMATION_SCHEMA.INNODB_METRICS. I'm uncertain because I see it in the MySQL 5.5 reference glossary: https://dev.mysql.com/doc/search/?d=10&amp;p=1&amp;q=innodb_metrics.

mysql --version
mysql  Ver 15.1 Distrib 5.5.56-MariaDB, for Linux (x86_64) using readline 5.1


When I try to configure it through my.cnf I get:

mysqld: unknown variable "innodb_monitor_enable"


When I try to configure it through the MySQL CLI I get:

MariaDB [(none)]&gt;  SET GLOBAL innodb_monitor_enable = trx_rw_commits;
ERROR 1193 (HY000): Unknown system variable 'innodb_monitor_enable'
MariaDB [(none)]&gt;  SET GLOBAL innodb_monitor_enable = trx_nl_ro_commits;
ERROR 1193 (HY000): Unknown system variable 'innodb_monitor_enable'
MariaDB [(none)]&gt;  SET GLOBAL innodb_monitor_enable = trx_ro_commits;
ERROR 1193 (HY000): Unknown system variable 'innodb_monitor_enable'
MariaDB [(none)]&gt;  SET GLOBAL innodb_monitor_enable = trx_rollbacks;
ERROR 1193 (HY000): Unknown system variable 'innodb_monitor_enable'


My guess is that it was introduced in 5.6 because
https://dev.mysql.com/doc/refman/5.5/en/innodb-information-schema-metrics-table.html redirects to 8.0 and 5.6 works.

Additional info

Turns out that, as shown below

SELECT VERSION()
    -&gt; ;
+----------------+
| VERSION()      |
+----------------+
| 5.5.56-MariaDB |
+----------------+


...I was looking in the wrong place. I actually am using MariaDB as the database management system, and @danblack pointed out it was released in 10.
Your version string indicate your client version is MariaDB. Making the assumption that your server is too and looking at the MariaDB kb INFORMATION_SCHEMA.INNODB_METRICS was added in 10.0.