After ultimately putting the new 9 version into production and testing alerting and call routing successfully, I poked around to verify health and found the Native Agent Adapter stopped. I couldn't start it from the Serviceability GUI, nor the CLI.
This was concerning as the description is "This service allows you to forward SNMP requests to another SNMP agent that runs on the system." and given CER relies heavily on SNMP, I was sure I was doomed.
As it turns out, it's a bug, you don't need it, it will never run in VMware, and Cisco is going to make it go away at some point.
There goes an hour of Googling....
CSCto04582 "Native Agent Adapter " service should be removed
VMware install Native agent adapter service is stopped in the CER services page. Cannot be started.
CLI from CER when executing
utils service list
Native Agent Adapter[STOPPED] Component is not running
VMware installations.. VMware installs will show Native Agent Adapter STOPPED and cannot be started.
There is None. This is a cosmetic error and can be avoided. VMware does not use the Native Agent Adapter and will not start nor can be started.