Duo Splunk Connector allows administrators to easily import their Duo logs into their Splunk environment.

Once configured, the connector automatically pulls in the following Duo logs for the last 7 days:
  Activity Logs
  Administrator Logs
  Authentication Logs (v1 and v2)
  Telephony Logs (v1 and v2)
  Endpoint Logs
  Trust Monitor Logs
The connector comes populated with default dashboards for the above logs. Administrators can create new dashboards or manipulate the existing dashboards.