Add more statistical values (minimum latency, variance, skewness, kurtosis...)

[thatsdone]

Describe the Issue (Bug/Feature)
This is a suggestion improving performance measurement output.

I think it's a good idea some more statistical values including:

• minimum latency (Actually, this is the 0th percentile that we don't have now.)
• variance (or standard deviation)
• skewness
• kurtosis

To Reproduce

Run sbk (at least object storage test such as '-driver minio').

Expected behavior

Output the additional output values listed abve.

Additional context

BTW, is there any explanations of SLC?
More simply speaking, what does SLC stand for in the measurement results?

[kmgowda]

@thatsdone thank you for your issue on improvements

here are my comments

• minimum latency (Actually, this is the 0th percentile that we don't have now.)
  ok, I will add the minimum latency and 1st percentile , but now i am the verge of reaching version 1.0 ; I will add this feature after 1.0 release ; however, I welcome you want to contribute to this.

• variance (or standard deviation)
  SLC (Sliding latency Coverage) factors , solve this purpose , read this : https://github.com/kmgowda/SBK#running-performance-benchmarking

• skewness
  performance latency percentile graphs are always right skewed (hence the name , sliding latencies ) ; nothing can be done for this

• kurtosis
  there are lower and higher discarded latency counts ; I think it's a good idea to add percentage values ; I will add this feature after 1.0 release ; however, I welcome you want to contribute to this.

[kmgowda]

@thatsdone check this paper about SLC : https://kmgowda.github.io/SBK/docs/sbk-slc.pdf