THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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On kubernetes env, the consuming time of create a pod is longer than common container, so it is better to not create all prewarm pod at the same time.
this one option is `create prewarm pod gradually`, this can avoid send `send a lot of creation pod request to kube api serverserver`.
2. When create prewarm, need to support retry and cannot exceed the maximum retry limit.
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