What's the opposite of telemetry? [closed]

I don't think there's an antonym. In the contexts where you would use "telemetry", any measurement that isn't specifically indicated to be remote would be assumed to be local, so you'd just say "measurement" or "metric".

For example, if an astronaut's spacesuit has a readout of their vital statistics, when the astronaut looks at it, it would be his metrics, but Mission Control would access it using telemetry.

Telemetry is remote measurement.

It's opposite is direct measurement.

For example, in medicine a telemetry floor is where patients are placed on a remote cardiac monitor. They can wander freely around without wires. In a directly measured setting, they'd be wired to the cardiac monitor.