Tracking User Actions
TeamCity logs user actions into the Audit log, which is available on the Administration | Audit page.
View User Audit Log
Here you can see who deleted a build configuration or project, assigned a role to a user, added a user to a group, modified a build configuration, and much more. To find the required information faster, filter the log by the activity type, projects/build configurations, and/or particular users.
If settings of a project or build configuration were modified, you can see the name of a user who made the modification and view the change itself by clicking the corresponding link. Project and build configuration settings are stored on the disk in plain XML, so the link will open a usual TeamCity diff window showing changes in these XML files.
You can also view the latest modifications made to a project or build configuration on its Settings page by clicking View history.