[tgsovlerkhgsel]

No, I assume but Mozilla was first collecting telemetry to see if enabling CT would cause user-visible errors or not.

[lxgr]

Ah, good point – presumably 2 also sends telemetry to Mozilla?

[tgsovlerkhgsel]

I would expect (without having checked) that both 1 and 2 send telemetry to Mozilla if and only if the global telemetry switch is on (which I think it is by default).