[MDEV-25034] Feature request: Server system variables source of configuration - Jira

When we analyse MariaDB servers of our customers it is sometimes not clear from where (which file) a specific configuration variable is coming from.

Thus it would be greate to see the configuration source of a variable. For example:

{{SQL> SELECT * FROM information_schema.global_variables LIMIT 10;

+----------------------------------------------+----------------+------------------------------------+

| VARIABLE_NAME                                | VARIABLE_VALUE | VARIABLE_SOURCE                    |

+----------------------------------------------+----------------+------------------------------------+

| INNODB_LOG_CHECKSUMS                         | ON             | default                            |

| PERFORMANCE_SCHEMA                           | ON             | /etc/mysql/my.cnf                  |

| SYSTEM_VERSIONING_ALTER_HISTORY              | ERROR          | /etc/mysql/conf.d/mariadb.cnf      |

| UNIQUE_CHECKS                                | ON             | /etc/mysql/mariadb.conf.d/blub.cnf |

| PERFORMANCE_SCHEMA_EVENTS_WAITS_HISTORY_SIZE | 10             | default                            |

| MAX_RELAY_LOG_SIZE                           | 134217728      | online                             |

| PERFORMANCE_SCHEMA_MAX_COND_CLASSES          | 90             | default                            |

| HAVE_RTREE_KEYS                              | YES            | /etc/mysql/my.cnf                  |

| PERFORMANCE_SCHEMA_MAX_COND_INSTANCES        | -1             | default                            |

+----------------------------------------------+----------------+------------------------------------+

Where variable source can be:

I have not found this FR in jira. I hope I have searched good enough...

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