After two months, postgres database suddenly stopped working, citing "getadrinfo ENOTFOUND top2.db-app-name.internal". Any tips?

I followed the advice in Database unavailable. Can't connect nor restart or anything else. - #3 by Sam-Fly, and it worked without clearing data:

List machines for your Postgres app
fly machine list -a <name>

Restart machine
fly machine restart <machine-id> <name>

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