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 substantial increase in both the Mean Kepler CPU Utilization and the Standard Deviation (Std Dev) percentages, indicating a significant performance regression.

1. Analysis of CPU Utilization:

   • On 2024-07-31 at 18:18:00Z, the Mean Kepler CPU Utilization was recorded at 0.3280331034%, which is a drastic increase from the previous day's value of 0.0597766338% on 2024-07-30 at 18:15:51Z.
   • Similarly, another test on the same day (2024-07-31) at 19:50:43Z showed a Mean Kepler CPU Utilization of 0.3038928317%.

2. Analysis of Standard Deviation:

   • The Std Dev on 2024-07-31 at 18:18:00Z was 0.2598348881%, significantly higher than the previous day's Std Dev of 0.0362022150%.
   • The test at 19:50:43Z on 2024-07-31 also showed a high Std Dev of 0.2290510851%.

3. Comparison with Historical Data:

   • The historical data from the days leading up to 2024-07-31 showed much lower values for both Mean Kepler CPU Utilization and Std Dev. For instance, on 2024-07-30, the values were 0.0597766338% (Mean CPU Utilization) and 0.0362022150% (Std Dev), which are significantly lower than those observed on 2024-07-31.

4. Conclusion:

   • The sharp increase in both Mean Kepler CPU Utilization and Std Dev on 2024-07-31 compared to the previous days indicates a significant performance regression. This could be due to various factors such as changes in workload, configuration issues, or underlying hardware problems. Further investigation and analysis would be required to pinpoint the exact cause of this regression and to implement corrective measures.