Therefore it's time to upgrade AppMon & UEM to the new, all-in-one Dynatrace solution.
If you hold a perpetual AppMon & UEM license, you can continue running it unsupported. This is not recommended due to the lack of fixes and security patches!
However, it wouldn't be possible to open support tickets after March 31, 2021, except you have extended or premium support. For further questions, please look at the FAQ or post your question in the Open Q&A community.