AppDynamics is primarily an APM product, not a SEIM.

Also, from a business perspective, Cisco basically removed a competitor from the field.

I bet they will just try to upsell all the AppD customers with Splunk ES/SIEM. If the Thousand Eyes and AppD integration is any indicator they will add a button in AppD that opens up Splunk...

Thoughts and prayers to the people who will be tasked to consolidate the portfolio.