[v14] Reduce backend load created from session trackers #42695
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Session trackers were originally added to facilitate joining sessions and enforcing moderation policies. When a session is created, a new tracker is written to the backend and a background routine is spawned to periodically update the status of the tracker until the session is terminated. This can cause a massive amount of backend activity for a cluster that is spawning large quantities of sessions per second. While in most cases where humans are starting the sessions this isn't a problem, any machine id heavy use cases could trigger backend throttling. Since non-interactive sessions and sessions started by tbot are not meant to be joined or moderated, the existence of a session tracker for them doesn't provide much benefit, especially now that session recordings are disabled for non-interactive sessions. To prevent excess backend writes session trackers are no longer created for non-interactive and tbot sessions.
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Backport #42324 to branch/v14
changelog: reduce backend writes incurred by tracking status of non-recorded sessions.