As reported in issue #177, audit logging is currently broken. This is because AdvancedAuditing is enabled by default, but is not configured e.g. --audit-log-format and --audit-policy-file flags are not set. And since these flags are missing, no events are currently being logged.
As a temporarily workaround, we can set AdvancedAuditing=false to at least get the old style audit logs working again.
Longer term, we should probably enable and configure advanced auditing by default in some form.