using `flyctl machine` for ephemeral telemetry data capture

[JP_Phillips]

@w8emv

if I need to wink a globally routable IPv4 address into existence for a minute,
and then take it offline, the only pricing I see is at the $2/mo monthly level

You should be able to take advantage of a shared IPv4 for times when you need to access the App (assuming the request fits the requirements of shared IPs).

@w8emv

What I want to do here looks like it needs to be done with flyctl machine
instead of an app

I think machines line up well with what you seem to be wanting to do. With machines, the App is a shell to contain resources (machines, volumes, IPs, etc.) versus a full fledge resource backed by Nomad. Everything flyctl machine does is backed by an API that you can also use directly.