This appendix explains the use of Application Performance Index (Apdex) in RUEI.
Apdex is an open standard for reporting and comparing the performance of software applications. It addresses the issue that response time measurements can be difficult to evaluate and it provides a method to convert many measurements into one number on a scale of 0 to 1.
This metric can now be used to define RUEI KPIs. For example to set up an Apdex score for your web site:
Create a KPI as described in Section 8.2, "Defining KPIs and SLAs".
Set the Metric option to Apdex (available under Satisfaction).
Set the calculation to either Page instance data or Function instance data.
Modify any other settings as described in Section 8.2, "Defining KPIs and SLAs".
The Apdex score is calculated by adding the Good count to the OK count divided by 2 and then that total is divided by the Total count.
After setting up the Apdex KPI, you can check the results using Section 6.1, "KPI Overviews". For information on Apdex KPIs, see Table E-2, "KPI Metrics".