as AppMon and Dynatrace are separate products you'll need to uninstall the AppMon Agent and install the Dynatrace OneAgent. As the name suggests you only install one OneAgent per host instead of possibly multiple AppMon Agents so your number of Agents may also decrease.
If you keep your AppMon Server running you can integrate AppMon data into Dynatrace starting with AppMon 7.1: https://www.dynatrace.com/support/help/integration...
I'll also take this as an opportunity to plug some of the conversion services that are available if you are looking at converting to Dynatrace:
Thank you James and Franz!
Looks like uninstalling dtagent and installing one agent is the only option left for our current environment qith 6.5 version.
Please suggest if there are any options to atleast partially migrate agents or any API's which needs to be included to get the AppMon 6.5 agents migrated to one agent.