Unclear What claiming a session does is not known.
What
A remote session is one that runs on a machine in the cloud rather than on your own computer. These sessions now accept a control request, a message that tells the session to do something, named claim_session.
Two new usage-data events were also added. One concerns a cached signature check, and one is recorded when a comment classifier is unavailable and the work is handed off.
Why
This points to new handling of who owns, or has taken over, a remote session.
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What claiming a session does is not known.