Replace average response times with percentiles & min/max

[ghost]

Web performance has high outliers making average response times misleading. Can we replace mean with percentiles? I propose p50 (median), p95, p99. I'd also add min and max.

[cgoldberg]

exported stats already contain the following percentiles:
"50%","66%","75%","80%","90%","95%","98%","99%","100%"
as well as min/max.

[ghost]

Hi @cgoldberg Sorry, I wasn't really clear here. I was thinking about the WebUI. The charts plot average response times. Would different coloured lines representing percentiles be possible? Also in the stats we have average. My suggestion would be to a least replace that with p99. WDYT?

[daluu]

I think mean could still be useful. Rather than replace, add on the missing desired stats. And/or perhaps make it configurable what to show, in case someone doesn't want to see the mean for example.

[cgoldberg]

I think the Web UI is supposed to display an average over a moving window, not the overall average... see: #667

I'm not sure if a moving average is preferable to an overall percentile?

[ghost]

OK. I think some users may still want an average as @daluu suggests. I wonder if we can add moving percentiles in the charts and in the flat stats? I remember this data is available from a web API. Not sure how the UI currently reads the data. We probably also want to add some form of persistence, but I think that would be another ticket. Should agree on some additional percentiles and I can look into it?

[cyberw]

Closing due to lack of activity. Some improvements have been made in this area though...

[alphaw1n]

Is it now possible to configure percentiles and the maximum value of response time on the graph? I want to see this on a chart so that I can understand at what point the short-term delays occur. I couldn't find this in the documentation, unfortunately...