Please note, starting with version 3.x., only Jira 9.2 and Confluence 7.20 and upwards support writing to the audit log. This is due to the audit log multi-platform code by Atlassian, that is needed for Jira 10, please see https://bitbucket.org/atlassian/platform-module-usage/wiki/auditing.md.
However, you can still find the author and data of the change in the database table as described below.



Since version 2.1.x, configuration changes are noted in the audit log of Jira/Confluence.



Additionally, you can see the user who did the change, e.g. 


Additionally, you can find the information by running the following database query:

select "LAST_MODIFIED_BY", "LAST_UPDATED" from "AO_F58FCA_ALBA_CONFIG" order by "ID" desc limit 1;
CODE


Output:

 LAST_MODIFIED_BY | LAST_UPDATED
------------------+---------------
 admin2           | 1637851297239
CODE


LAST_MODIFIED_BY refers to the username and LAST_UPDATED is the unix timestamp of when the change was saved. You can use websites like https://www.unixtimestamp.com/index.php to convert the timestamp