We have added additional audit logging and it's available to team admins to see actions taken by themselves as well as all team members. Any team admin will have access to this log by clicking on "Account" on the right navigation menu and then clicking on "Team Log".
This log will show you the time, user, and the action that was taken. In this log, you will see when users login, shut down jobs, submit jobs, shutdown jobs via API, when team admins impersonate a user, and much more.
These logs are continuously being developed and you will see additional categories in the future along with additional logs. Most of these entries are self explanatory by design, but if you run across something that you don't understand and want clarification, please reach out to firstname.lastname@example.org and we'd be happy to help!