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> This may be disabled with DD_INSTRUMENTATION_TELEMETRY_ENABLED=0.

So is it default on or off? I am confused

The "how to disable" would imply it is enabled (on) by default. So it is opt-out rather than opt in.

I think parent was referring to the telemetry being opt in (enabled) by default, whereas you're mentioning that the telemetry itself is opt out. Both referring to the same thing, just opposite verbiage funny enough.

That's a misunderstanding I think, dictionaries say (of opt-in)

- choose to participate in something.

- to choose to be part of an activity, arrangement, etc

- The property of having to choose explicitly to join or permit something; a decision having the default option being exclusion or avoidance; used particularly with regard to mailing lists and advertising.

[the first few hits on google]

Ah you're right - I never noticed the nuance of choice being a key part of opt in, rather than the participation itself. TIL!

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