Hi @gongarek - welcome to the Percona forums!
That’s great that you want to use PMM in an experimental manner, what better way to learn than to do it risk-free! You are correct regarding the encrypted connection - all PMM clients MUST communicate with PMM Server over an encrypted connection. That means you should run with $PMM_SERVER=127.0.0.1:443
Note it is acceptable for browsers (Chrome, Brave, etc) to access PMM Server over an un-encrypted channel.
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