> This is not telemetry, it is just additional local logging.

I agree.

> I don’t understand why it’s being framed as telemetry. Just say rustc is (optionally) logging more by default and the compiler people are writing tools that can analyze those logs if you choose to upload them.

Any kind of metrics mechanism can look like the start of telemetry. I wanted to preempt that misconception by explicitly stating the difference, before any conversation or implementation occurs.

> Separately it sounds like rustc needs to do a better job collecting crash data that can be easily attached to a bug ticket.

I agree.