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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` in a very short time.

    2. When create prewarm, need to support retry and cannot exceed the maximum retry limit.

    3. when backfill prewarm, need to avoid `creating a large number of additional prewarm`. 

    4. when create container, if doesn't have prewarm container which its memory equal with the action's memory, need to support `choose a higher memory prewarm container`, this is optional.

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