The Artifactory access.log
Artifactory maintains an access log containing all security-related events, their source IP and context. Events include accept/reject information about: logins, artifacts downloads and browsing and artifact deployments.
The access log is located at $ARTIFACTORY_HOME/logs/access.log.
You can also view and download the access log from Artifactory's UI, by going to Admin:Advanced:System Logs:

Watches
You can also choose to receive focused information about repository events for a specific repository section, using the Watches add-on.