IP addresses are logged. It’s not mentioned in the telemetry document because it didn’t occur to me that it needed to be mentioned—that’s how all internet services work and it’s not an additional header that we do anything special to send. For the sake of completeness, it should probably be listed as well. In practice it is not feasible to run an open internet service without recording IP addresses since without them you lose the very necessary ability to detect and filter abusive IP addresses, and your service would just be a sitting duck for all kinds of attacks. I would be shocked if there’s a single operator of any public internet service that isn’t logging IP addresses.
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