Issue Summary

In the Jira Cloud site-level audit logs some actions are attributed to Author:JIRA despite having been enacted by a user. This appears to affect all audit logs in the Event category group management and user management
 
The following is noted in the article Audit activities in Jira applications:

There’s a known issue which prevents the Author field from displaying the username for changes that were made in the user management pages in Jira cloud products (including changes to users, groups, and application access). For example, events like users being created or assigned to groups won’t include the username of the user who made the change.

Steps to Reproduce

1. Go to User Management and click on a user you wish to remove.
2. Click the ellipses [...] and select Remove user
3. Go to  https://<YOUR SITE NAME>.atlassian.net/auditing/view and observe that the user removal has been attributed to Author:JIRA:
   
   Note: this is only one among many actions that result in an action being attributed to JIRA in the audit logs

Expected Results

Actions should be attributed to the user who took them in the site-level audit logs.

Actual Results

Some actions in the site-level audit log are attributed to JIRA

Workaround

If you have an Atlassian Guard subscription you may see more detail information in your org-level audit logs: