[DISCUSS] Agent Sandbox: v1beta1 graduation and v1alpha1 deprecation plan

[Janet Kuo]

Hi all, 

As discussed in today's community meeting (Issue #740), we are preparing to graduate our APIs from v1alpha1 to v1beta1, and the beta API will introduce a few several structural breaking changes (e.g., resolving mutually exclusive WarmPool/Template fields). To keep the Agent Sandbox lightweight and free of legacy schema debt (e.g. avoid complex conversion webhook), we are considering a "drop & adopt" strategy, which will drop the support of v1alpha1 APIs completely, while allowing adopting existing objects using the new v1beta1 API objects.

As documented in this comment, we will provide a documented migration flow using kubectl delete --cascade=orphan to allow the new v1beta1 controller to seamlessly adopt existing running workloads without downtime. If you have feedback/concerns, please let us know by next week!

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Janet Kuo