Deployment reliability on LiveKit Cloud

LiveKit Cloud utilizes a rolling deployment strategy for its agent instances, ensuring minimal disruption by gradually replacing old instances with new ones during updates or rollbacks. This approach involves several key phases: building a new container image, deploying new instances alongside existing ones, routing new sessions to these new instances, and initiating a graceful drain of old instances, which allows them to finish active sessions before shutting down. Two distinct timers, the cloud rollout policy and the runtime drain_timeout, dictate how long old instances can remain active, with a default maximum of one hour. Successful deployment hinges on understanding when the drain begins, verifying routing changes, and ensuring that session durations do not exceed these grace periods. Common issues include signal handling errors due to wrapper scripts, sessions exceeding allotted time, and the introduction of non-backward-compatible changes. Mitigation strategies involve direct handling of signals, designing resumable sessions, and verifying session routing and assignment per version. It is crucial to monitor deployment progress through logs and metrics to ensure a smooth transition and address any anomalies promptly.

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