Timestamping Authority has the following known issues.
tsactl logs not forwarded to Splunk (EDM-13275)
When integrated with a Splunk server, PKI Hub does not forward logs recording tsactl commands. However, these logs can be browsed using the Grafana portal.
See Starting up log-forwarder for integrating a Splunk server or Browsing logs with Grafana for browsing logs in the Grafana portal.