At https://www.percona.com/doc/percona-monitoring-and-management/faq.html#what-are-the-minimum-system-requirements-for-pmm we have some requirements for PMM Docker.
We need to do some basic testing on AMI and OVA images to confirm we can run PMM on it.
Let's do some basic test like: Start PMM, connect to 5 clients, run for 1-2 days, run basic tests and get visual confirmation that "it's working".
For better estimates, we need Mykola Marzhan help but, I would recommend :
AMI: 2GB RAM, 1 core (todo: see proper AWS name for the node )
OVA: 2 Gm, 1 core
Not sure we should try 1 Gb images. It will be good, but let's confirm this is working on 2Gb and then try to reduce requirements.