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 values that were generally hovering around 0.05% to 0.07%. This represents an increase of more than 5 times the typical mean values observed in the preceding days.
• Additionally, the Std Dev on the same date and time was 0.2598348881%, which is also significantly higher than the usual range of 0.02% to 0.05% observed in the earlier test results.
• The subsequent test on the same day at 19:50:43Z also showed elevated levels of Mean Kepler CPU Utilization at 0.3038928317% and Std Dev at 0.2290510851%, confirming the trend of increased resource usage.
• These metrics suggest a degradation in performance, as higher CPU utilization and variability (Std Dev) typically indicate less stability and efficiency under load.

Conclusion:
The data from the last two days clearly points to a performance regression in the Kepler Stress Test Metrics. This regression is characterized by a significant rise in CPU utilization and variability, which could impact the overall performance and reliability of the system under test. Further investigation and analysis would be necessary to identify the root cause of this regression and to implement appropriate fixes or optimizations.