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

In the test results from the last two days, there is a noticeable and significant increase in both the Mean Kepler CPU Utilization and the Standard Deviation (Std Dev) values, indicating a performance regression.

1. Analysis of Recent Test Results:

   • 2024-07-31T18:18:00Z:
     • Mean Kepler CPU Utilization: 0.3280331034%
     • Std Dev: 0.2598348881%
   • 2024-07-31T19:50:43Z:
     • Mean Kepler CPU Utilization: 0.3038928317%
     • Std Dev: 0.2290510851%

   Compared to the previous results:

   • 2024-07-30T18:15:51Z:
     • Mean Kepler CPU Utilization: 0.0597766338%
     • Std Dev: 0.0362022150%

2. Comparison and Conclusion:

   • The Mean Kepler CPU Utilization on 2024-07-31 shows an increase of approximately 0.268% and 0.244% at two different times compared to the previous day.
   • The Std Dev also shows a significant increase, indicating a higher variability and less stability in CPU utilization. The Std Dev increased by approximately 0.223% and 0.193% at two different times.

This substantial increase in both the mean utilization and variability suggests a performance regression. The changes are significant enough to warrant further investigation into the causes, which could include changes in test conditions, configuration, or external factors affecting the performance. Immediate attention and action may be required to address these regressions and return to the previous performance baseline.