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initial Req = (cur pool allocatable - prev pool allocatable)/2 + prev pool allocatable
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initial limit = cur pool allocatable
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if db is intially provioned into smallst nodepool, min allowed = initial request * 0.9
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else, minAllowed = smallest pool's midpoint * 0.9 = more specifically (smallest pool allocatable / 2) * 0.9
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max allowed = biggest nodepool allocatable
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NB: If cur pool is the smallest one, consider zero value as the prev pool's allocatable
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podLifeTimeThreshold default to 15 mins
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resourceDiffPercentage defaults to 50. If your script is too aggressing , Set it to lower value like 30
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