[Feature] Add an e2e test for Autoscaler to scale up by manually updating minReplicas

[kevin85421]

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• I had searched in the issues and found no similar feature requirement.

Description

Users may manually update minReplicas to a value greater than replicas. Then, KubeRay will create new Pods to ensure the worker group has $minReplicas Pods. It's the Autoscaler's duty to update replicas to ensure it is equal to or greater than minReplicas.

For this test,

• Create a RayCluster with the Autoscaler enabled, containing a worker group with replicas: 1 and minReplicas: 0.
• Update minReplicas from 0 to 2.
• KubeRay should create an additional Pod.
• Submit some Ray detached actors to trigger autoscaling to 5 Pods.
• Verify whether the Autoscaler successfully scales up to 5 Pods.
• Check whether replicas is set to 5.

Use case

No response

Related issues

No response

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

[LeoLiao123]

Hi @kevin85421 , I would like to take on this issue.