Regression Detected in Kepler or kube-apiserver CPU Utilization Performance

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Regression detected from the following reports:

Report: https://sustainable-computing-io.github.io/kepler-metal-ci/kepler-stress-test-metrics.html

Details:
Significant Regression Detected

The test results from the last two days, specifically on 2024-07-31, show a significant increase in both the Mean Kepler CPU Utilization and the Standard Deviation (Std Dev) percentages, indicating a performance regression.

Detailed Analysis:

• On 2024-07-31 at 18:18:00Z, the Mean Kepler CPU Utilization was recorded at 0.3280331034%, which is a substantial increase from the previous day's value of 0.0597766338% on 2024-07-30 at 18:15:51Z.
• Similarly, the Std Dev on 2024-07-31 at 18:18:00Z increased to 0.2598348881% from 0.0362022150% on the previous day.
• A second test on the same day (2024-07-31 at 19:50:43Z) also showed elevated levels with a Mean Kepler CPU Utilization of 0.3038928317% and a Std Dev of 0.2290510851%.

Conclusion:
The data from 2024-07-31 demonstrates a clear and significant performance regression in terms of both increased CPU utilization and variability (Std Dev). This suggests that changes made prior to this testing period adversely affected the system's performance, warranting further investigation and potential rollback of recent changes to stabilize performance.