The resource usage of web applications tends to fluctuate with changes in the number of visitors, displaying noticeable tidal characteristics. To ensure stability, service providers often allocate resources for their applications according to resource usage during peak periods. These resources can easily be underutilized during off-peak hours.

If these idle resources can be reclaimed and temporarily allocated to lower-priority services and returned promptly to online services when needed, the overall resource utilization rate can be significantly improved.

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