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Question by Jan-Hendrik W. · Nov 11, 2014 at 01:17 AM ·

How to use 99th percentile?

Hi,

 

I want to report the 99th percentile from one of our BTs in a sla with some external partner.

In the context menu of a normal chart I can change the aggregation to percentile 99, but I have no idea, which column (average, max, min, last...) shows the right value.

When I use the percentile chart, there is no 99th. Just the 95th, 90th, 75th, ....

Which way would show me the right values for my BT?

 

Regards,

Jan

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Answer by Jan-Hendrik W. · Nov 11, 2014 at 07:05 PM

Hi Reinhard,

thanks for your reply. The first dashboard will do it for me.

Regards,

Jan

 

PS: In the percentile chart you are able to 'select' some predefined columns like '95th Percentile' in your screenshot. I was wondering, why 99th is not possible. My question pointed on the table and not the graph (smile)

 

EDIT:

I just compared the percentile chart with the "normal" chart. I know the percentiles are calculated for completed hours, so I took a custom time range: 8:00 - 9:00

The values are completely different. I was expecting, that the 95th Percentile on the left would be the same as on the right.
I am a bit confused now. What am I doing wrong?

 

Regards,

Jan

 

 

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Answer by Reinhard W. · Nov 11, 2014 at 08:59 AM

Jan,

for reporting SLA I could recommend a chart like this one. It combines all the relevant metrics in one chart. Just add the result metric of your BT (assuming response time) mutilpe times to a single chart and then change the aggregation value of the individual to max, min, average as well as the percentiles you want. If there is a big skew between max and min I recommend to change the axis type to logarithmic.

 

In a percentile chart liek the one below there is of course no 99th percentile to 'select'. The x-axis itself is the percentile and the y-axis is the value of the percentile. So if you go to the right end (99) on the x axis and read the y value there that's your 99th percentile aggregated over the whole timeframe.

 

Reinhard

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