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one option is `create prewarm pod gradually`, this can avoid `send a lot of creation pod request to kube api server` 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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