It describes error reports being sent to their self-hosted Sentry servers.
There is also update checking, but that seems squeaky clean to me. Then, there is this build exception to those two implementations:
This issue does not address the privacy policy changes or Contributor’s License Agreement mentioned earlier, which deal with the far greater issue of GPL violation. As a result, the Audacity developers’ reputation has severely sunk, even with their 180 telemetry turn.